home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
InfoMagic Standards 1994 January
/
InfoMagic Standards - January 1994.iso
/
ccitt
/
1988
/
troff
/
8_2_09.tro
< prev
next >
Wrap
Text File
|
1991-12-22
|
84KB
|
3,485 lines
.rs
.\" Troff code generated by TPS Convert from ITU Original Files
.\" Not Copyright (~c) 1991
.\"
.\" Assumes tbl, eqn, MS macros, and lots of luck.
.TA 1c 2c 3c 4c 5c 6c 7c 8c
.ds CH
.ds CF
.EQ
delim @@
.EN
.nr LL 40.5P
.nr ll 40.5P
.nr HM 3P
.nr FM 6P
.nr PO 4P
.nr PD 9p
.po 4P
.rs
\v'|.5i'
.sp 1P
.LP
3.5.14
\fIStandard format of \fR \fIparameter value PAD service signals
.sp 9p
.RT
.PP
The \fIparameter value PAD service\fR signal consists of the
following elements:
\v'3p'
.EF '% Fascicle\ VIII.2\ \(em\ Rec.\ X.28''
.OF '''Fascicle\ VIII.2\ \(em\ Rec.\ X.28 %'
.RT
.LP
<parameter value PAD service signal>\ ::\ =
<PAR> <parameter
list>
.LP
where
.LP
<PAR>\ ::\ =
5/0 (P) 4/1 (A) 5/2 (R) 2/0 (SP)
.LP
(Response from the local PAD to a request for parameter values)
.LP
5/2 (R) 5/0 (P) 4/1 (A) 5/2 (R) 2/0 (SP)
.LP
(Response from the remote PAD to a request for parameter values)
.LP
<parameter\ list>\ ::\ =
one or more of <parameter>
.LP
<parameter>\ ::\ =
<parameter reference> <parameter value>
<text>
.LP
<parameter\ reference>\ ::\ =
decimal reference of the parameter followed by the character 3/10\ (:)
.LP
<parameter\ value>\ ::\ =
decimal value of the parameter
.LP
<text>\ ::\ =
2/0 (SP) 2/13 (\(em) 2/0 (SP) followed by the
extended dialogue mode text as specified in Table\ 8/X.28
.PP
If the requested parameter reference or value is invalid, the
characters\ 4/9\ (I) 4/14\ (N) 5/6\ (V) will be sent in place of the appropriate
parameter value.
.PP
If more than one parameter value is contained in the parameter value \fIPAD
service\fR signal the chara
cters\ 2/12\ (,) 2/0\ (SP) will be sent before
the next parameter reference.
.PP
In extended dialogue mode, if the length of the next parameter
reference, value and text would cause the line length to exceed the value of
PAD parameter\ 10 (if it is non\(hyzero) then the character\ 2/12\ (,)
followed by
the format effector may be used.
.RT
.sp 1P
.LP
3.5.15
\fIFormat of the selection PAD command signal\fR
.sp 9p
.RT
.PP
A \fIselection PAD command\fR \| signal shall, in the following order,
consist of a \fIfacility request\fR \| block, or an \fIaddress\fR block,
or both,
optionally followed by \fIcall user data\fR field.
.RT
.sp 1P
.LP
3.5.15.1
\fIFormat of \fR \fIfacility request block\fR
.sp 9p
.RT
.PP
Characters representing the
\fIfacility request\fR \| code
shall be sent as defined in Table\ 4/X.28. When more than one \fIfacility
request\fR code is to be sent, the character\ 2/12 (,) shall be sent to
separate the \fIfacility\fR \fIrequest\fR codes. The character\ 2/13 (\(em)
shall be sent at the end of the
\fIfacility request\fR block.
.RT
.sp 1P
.LP
3.5.15.1.1\ The format of the
NUI \fIfacility request\fR \| signal
is as
follows:
\v'3p'
.sp 9p
.RT
.LP
<facility request> :: =\fR <N> <NUI string>
.LP
<N> :: =\fR IA5 character 4/14 (N)
.LP
<string>\ ::\ =
one or more characters in columns 2 to 7 of
International Alphabet No.\ 5\ (IA5), except 2/0\ (SP)
7/15\ (DEL), 2/13\ (\(em), 2/12\ (,) and\ 2/11\ (+).
.PP
\fINote 1\fR \ \(em\ The recognition by the PAD of the presence of the
\fIfacility request\fR \| signal should turn off the echo, (irrespective of its
parameter value) for the duration of the NUI \fIfacility request\fR .
.PP
\fINote\ 2\fR \ \(em\ The length of the NUI string is network dependent.
.PP
\fINote\ 3\fR \ \(em\ Characters in columns 0 and 1, except 0/13 (CR), and
characters 7/15\ (DEL), and 2/0\ (SP) may be included during the transmission
of the NUI string but will not form part of the NUI string and will be
discarded.
.bp
.RT
.sp 1P
.LP
3.5.15.1.2\ The format of the RPOA (transit network) selection \fIfacility\fR
\fIrequest\fR signal is \fIas\fR follows:
\v'3p'
.sp 9p
.RT
.LP
<RPOA facility request>\ ::\ =
<T> <RPOA string>
.LP
<RPOA\ string>\ ::\ =
The DNIC of the requested RPOA. In
addition, some networks may also support graphic
representations of the DNIC which may be used.
.LP
<T>\ ::\ =
IA5 character\ 5/4\ (T).
.sp 1P
.LP
3.5.15.1.3\ The format of the
reverse charging \fIfacility request\fR \|
signal
is as follows:
\v'3p'
.sp 9p
.RT
.LP
<reverse charging facility request>\ ::\ =\ <R>
.LP
<R>\ ::\ =\ IA5 character 4/2\ (R).
.sp 1P
.LP
3.5.15.1.4
\fIFormats for Closed User Group Signals\fR
.sp 9p
.RT
.PP
When the user has subscribed to Closed User Groups (CUG), a
preferential CUG must be chosen. In this case, only the \fICUG facility
request\fR signal may be used by the user.
.PP
When the user has subscribed to CUG and has outgoing access (CUGOA)
and/or incoming access (CUGIA), the user may choose whether or not to have a
preferential CUG. If a preferential has not been chosen, the user may signal
the \fICUG facility request\fR or the \fICUGOA facility request\fR in a
particular
\fIPAD Selection Command\fR Signal. When the user has chosen a preferential
CUG,
only the \fICUG facility request\fR signal may be used.
.PP
The \fICUG facility request\fR and the \fICUGOA facility request\fR shall
not be used in the same \fIPAD Selection Command\fR Signal.
.RT
.sp 1P
.LP
3.5.15.1.4.1\ The format of the
closed user group \fIfacility request\fR \|
signal
is as follows:
.sp 9p
.RT
.LP
<CUG facility request> :: = <G> <index>
.LP
<G> :: = IA5 character 4/7 (G)
.LP
<Optional index> :: = one or two decimal digits.
.PP
The PAD shall treat the absence of the index as an implicit
request for the preferential CUG.
.PP
The PAD shall treat the absence of a \fICUG facility request\fR as an
implicit preferential CUG request if the user has subscribed to the CUG,
CUGOA and/or CUGIA facility and has chosen a preferential.
.RT
.sp 1P
.LP
3.5.15.1.4.2\ The format of the closed user group with outgoing access
facility is as follows:
\v'3p'
.sp 9p
.RT
.LP
<CUG with outgoing access facility request> :: = <O> <index>
.LP
<O> :: = IA5 character 4/15 (O)
.LP
<Optional index> :: = one or two decimal digits
.sp 1P
.LP
3.5.15.1.5\ The format of the
charging information \fIfacility request\fR \|
signal
is as follows.
\v'3p'
.sp 9p
.RT
.LP
<charging information facility request> :: = <C>
.LP
<C>\ ::\ = IA5 character4/3 (C).
.sp 1P
.LP
3.5.15.1.6\ The format of the called address extension \fIfacility request\fR
signal is as follows:
\v'3p'
.sp 9p
.RT
.LP
CAE facility request:
.LP
<CAE facility request> :: = <E> <CAE string>
.LP
<E> :: = IA5 character 4/5 (E)
.LP
<CAE>\ ::\ =
The called address extension as a string of up to 40\ characters from
the set\ 3/0\(hy3/9. Further, other representations of the
called address extension are for further study.
.PP
The means to indicate the type of address present in the called
address extension facility is for further study.
.bp
.sp 1P
.LP
3.5.15.1.7\ The format of the fast select with no restriction on response
\fIfacility request\fR signal is as follows:
\v'3p'
.sp 9p
.RT
.LP
<fast select with no restriction on response facility
request> :: = <F>
.LP
<F> :: = IA5 character 4/6 (F)
.sp 1P
.LP
3.5.15.1.8\ The format of the called DTE reselection prevention \fIfacility\fR
\fIrequest\fR signal is as follows:
\v'3p'
.sp 9p
.RT
.LP
<called DTE reselection prevention facility request> :: = <S>
.LP
<S> :: = IA5 character 5/3 (S)
.sp 1P
.LP
3.5.15.1.9\ The format of the fast select with restriction on response
\fIfacility request\fR signal is as follows:
\v'3p'
.sp 9p
.RT
.LP
<fast select with restriction on response facility request> :: =
<Q>
.LP
<Q> :: = IA5 character 5/1 (Q)
.PP
The formats of other \fIfacility request\fR codes are for further
study.
.sp 1P
.LP
3.5.15.2
\fIFormat of address block\fR
.sp 9p
.RT
.PP
Characters representing a full address or an abbreviated address
shall be sent. When an abbreviated address is sent, it shall be prefixed by
character\ 2/14\ (.). When more than one address, either full address or
abbreviated address, is sent, the character\ 2/12\ (,) is sent as a separator.
When an abbreviated address is used, the call user data field shall be
separated from the \fIabbreviated address\fR signal by the character\ 2/10\
(*).
.RT
.sp 1P
.LP
3.5.15.2.1\ The format of the full address is as follows:
.sp 9p
.RT
.LP
<full\ address>\ ::\ =
one or more numeric characters of the
International Alphabet No.\ 5\ (IA5)
.PP
\fINote\ 1\fR \ \(em\ The numeric characters are those in the ranges 3/0
to\ 3/9.
.sp 1P
.LP
3.5.15.2.2\ The format of the abbreviated address is as follows:
.sp 9p
.RT
.LP
<abbreviated\ address>\ ::\ =
one or more characters in colums 2 to 7 of the International Alphabet
No.\ 5, except\ 2/10\ (*), 2/11\ (+) 2/12\ (,)
and\ 7/15 (DEL). The first character shall not be from the set\ 0\ .\|.\ 9
(3/0\ .\|.\ 3/9).
.PP
\fINote\ 1\fR \ \(em\ The PAD shall translate the string into a full address
.PP
\fINote\ 2\fR \ \(em\ Recommendations for the translation of the character
string to a full address are for further study.
.PP
\fINote\ 3\fR \ \(em\ This facility is optional.
.RT
.sp 1P
.LP
3.5.15.3
\fIFormat of \fR \fIcall user data field\fR
.sp 9p
.RT
.PP
The character 5/0 (P) or the character 4/4 (D) shall be sent,
followed by up to 12\ characters of user data or up to 124\ characters of user
data in conjunction with the fast select facility. Some networks may not
make this field available to the user.
.PP
\fINote\fR \ \(em\ The characters 0/13 (CR) and 2/11 (+) should not be
included in the user data field because they will be treated as a \fIPAD
command\fR
\fIsignal delimiter\fR and not transmitted to the remote packet mode DTE. The
editing characters should not be included in the user data field as they
will be treated as providing the editing function.
.RT
.sp 1P
.LP
3.5.16
\fIFormat of \fR \fIservice request signal\fR
.sp 9p
.RT
.PP
The format is for further study.
.bp
.RT
.sp 1P
.LP
3.5.17
\fIStandard format of \fR \fIclear indication PAD service\fR
\fIsignal\fR
.sp 9p
.RT
.PP
The \fIclear indication PAD service\fR signal will, in the following
order, consist of the following elements:
.RT
.LP
\(em
one mandatory field:
.LP
<a sequence of alphabetic characters indicating the clear
indication (see \(sc\ 3.5.17.1)> <formatting character>
.LP
\(em
the following optional fields:
.LP
<called DTE address block (see \(sc\ 3.5.17.2)> <formatting
character>
.LP
<optional facility block (see \(sc\ 3.5.17.3)> <formatting
character>
.LP
<optional clear user data block (see \(sc\ 3.5.17.4)> <formatting
character>
.sp 1P
.LP
3.5.17.1
\fIStandard format of the \fR \fImandatory field\fR :
.sp 9p
.RT
.PP
The mandatory field consists of the following elements:
.RT
.LP
<Mandatory field>\ ::\ =
<CLEAR> <cause> <cause code>
<diagnostic> <text>
.LP
<CLEAR> ::\ =
4/3 (C) 4/12 (L) 5/2 (R) 2/0 (SP)
.LP
<cause> ::\ =
one of the causes shown in Table 6/X.28
.LP
<cause\ code>\ ::\ =
2/0 (SP) 4/3 (C) 3/10 (:) followed by
1, 2 or 3\ characters which represent the decimal value of the cause code, as
specified in Recommendation\ X.25.
.LP
<diagnostic>\ ::\ =
2/0 (SP) 4/4 (D) 3/10 (:) followed by 1, 2 or 3\ characters which represent
the decimal value of the diagnostic code, as
specified in Recommendation\ X.25.
.LP
<text>\ ::\ =
2/0 (SP) 2/13 (\(em) 2/0 (SP) followed by extented
dialogue mode text as specified for the corresponding <cause> in Table\ 6/X.28.
.PP
\fINote\fR \ \(em\ The use of the <cause code> and <diagnostic> field is
optional.
.ce
\fBH.T. [T6.28]\fR
.ce
TABLE\ 6/X.28
.ce
\fBCause and extended dialogue mode text for clear PAD service signal\fR
.ce
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(72p) | cw(156p) .
<Cause> <Text>
_
.T&
lw(72p) | lw(156p) .
4/15(O) 4/3(O) 4/3(C) Call cleared, number busy
.T&
lw(72p) | lw(156p) .
4/14(N) 4/3(C) T{
Call cleared, temporary network problem
T}
.T&
lw(72p) | lw(156p) .
4/9(I) 4/14(N) 5/6(V) T{
Call cleared, invalid facility requested
T}
.T&
lw(72p) | lw(156p) .
4/14(N) 4/1(A) T{
Call cleared, access to this number is barred
T}
.T&
lw(72p) | lw(156p) .
4/5(E) 5/2(R) 5/2(R) T{
Call cleared, network detected local procedure error
T}
.T&
lw(72p) | lw(156p) .
5/2(R) 5/0(P) 4/5(E) T{
Call cleared, network detected remote procedure error
T}
.T&
lw(72p) | lw(156p) .
4/14(N) 5/0(P) T{
Call cleared, number not assigned
T}
.T&
lw(72p) | lw(156p) .
4/4(D) 4/5(E) 5/2(R) T{
Call cleared, number out of order
T}
.T&
lw(72p) | lw(156p) .
5/0(P) 4/1(A) 4/4(D) Call cleared, remote request
.T&
lw(72p) | lw(156p) .
4/4(D) 5/4(T) 4/5(E) T{
Call cleared, by remote device, data may be lost
T}
.T&
lw(72p) | lw(156p) .
5/2(R) 4/14(N) 4/1(A) T{
Call cleared, reverse charging refused
T}
.T&
lw(72p) | lw(156p) .
4/9(I) 4/4(D) T{
Call cleared, incompatible destination
T}
.T&
lw(72p) | lw(156p) .
5/3(S) 4/1(A) T{
Call cleared, ship cannot be contacted
T}
.T&
lw(72p) | lw(156p) .
4/6(F) 4/14(N) 4/1(A) T{
Call cleared, fast select refused
T}
.T&
lw(72p) | lw(156p) .
5/2(R) 4/15(O) 4/15(O) T{
Call cleared, cannot be routed as requested
\fINote\fR
\ \(em\ For details see Recommendation X.96.
.parag
T}
_
.TE
.nr PS 9
.RT
.ad r
\fBTable 6/X.28 [T6.28], p.\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [T7.28]\fR
.ce
TABLE\ 7/X.28
.ce
\fBExtended dialogue mode text for clear confirmation PAD service signal\fR
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(78p) | cw(102p) .
<CONF> <Text>
_
.T&
lw(78p) | lw(102p) .
4/3(C) 4/15(O) 4/14(N) 4/6(F) Call cleared, confirmed
_
.TE
.nr PS 9
.RT
.ad r
\fBTable 7/X.28 [T7.28], p.\fR
.sp 1P
.RT
.ad b
.RT
.ce
\fBH.T. [T8.28]\fR
.ce
TABLE\ 8/X.28
.ce
\fBPAD parameter names for extended dialogue mode\fR
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(36p) | cw(36p) | cw(120p) .
Parameter reference number T{
Abbreviated parameter name
(Note\ 1)
T} T{
Parameter description
(Note\ 2)
T}
_
.T&
cw(36p) | lw(36p) | lw(120p) .
\ 1 esc(ape) PAD recall using a character
.T&
cw(36p) | lw(36p) | lw(120p) .
\ 2 ech(o) Echo
.T&
cw(36p) | lw(36p) | lw(120p) .
\ 3 for(ward) T{
Selection of data forwarding characters
T}
.T&
cw(36p) | lw(36p) | lw(120p) .
\ 4 idl(e) Selection of idle timer delay
.T&
cw(36p) | lw(36p) | lw(120p) .
\ 5 dev(ice) Ancillary device control
.T&
cw(36p) | lw(36p) | lw(120p) .
\ 6 sig(nals) T{
Control of PAD service signals
T}
.T&
cw(36p) | lw(36p) | lw(120p) .
\ 7 bre(ak) T{
Operation on receipt of break signal
T}
.T&
cw(36p) | lw(36p) | lw(120p) .
\ 8 dis(card) Discard output
.T&
cw(36p) | lw(36p) | lw(120p) .
\ 9 CRp(ad) Padding after carriage return
.T&
cw(36p) | lw(36p) | lw(120p) .
10 fol(ding) Line folding
.T&
cw(36p) | lw(36p) | lw(120p) .
11 spe(ed) T{
Binary speed of start\(hystop mode DTE
T}
.T&
cw(36p) | lw(36p) | lw(120p) .
12 flo(w) Flow control of the PAD
.T&
cw(36p) | lw(36p) | lw(120p) .
13 LFi(nsert) T{
Linefeed insertion after carriage return
T}
.T&
cw(36p) | lw(36p) | lw(120p) .
14 LFp(ad) Padding after linefeed
.T&
cw(36p) | lw(36p) | lw(120p) .
15 Edi(t) Editing
.T&
cw(36p) | lw(36p) | lw(120p) .
16 Cdel(ete) Character delete
.T&
cw(36p) | lw(36p) | lw(120p) .
17 Ldel(ete) Line delete
.T&
cw(36p) | lw(36p) | lw(120p) .
18 Ldis(play) Line display
.T&
cw(36p) | lw(36p) | lw(120p) .
19 Esig(nals) Editing PAD service signals
.T&
cw(36p) | lw(36p) | lw(120p) .
20 Mas(k) Echo mask
.T&
cw(36p) | lw(36p) | lw(120p) .
21 par(ity) Parity treatment
.T&
cw(36p) | lw(36p) | lw(120p) .
22 pag(e) T{
Page wait
\fINote\ 1\fR
\ \(em\ These names are provisional. This name should appear in the
\fIparameter value PAD service\fR
signals. The name or abbreviation should be
accepted in the \fIread, set\fR
, or \fIset and read PAD command\fR
signals.
.parag
\fINote\ 2\fR
\ \(em\ In some networks this parameter description may appear in the
\fIparameter value PAD service\fR
signals. Alternative parameter descriptions are for further study.
.parag
T}
_
.TE
.nr PS 9
.RT
.ad r
\fBTable 8/X.28 [T8.28], p.\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.sp 1P
.LP
3.5.17.2
\fIFormat of the \fR \fIcalled DTE address block\fR
.sp 9p
.RT
.PP
The need and the format of the called DTE address block is for
further study.
.RT
.sp 1P
.LP
3.5.17.3
\fIFormat of the optional facility block\fR
.sp 9p
.RT
.PP
If subscribed to, or requested in the \fIselection PAD command\fR
signal (see Table\ 4/X.28), the optional facility block will contain the
charging information
and will be transmitted by the PAD to the
start\(hystop mode DTE. The format of the charging information is network
dependent.
.RT
.sp 1P
.LP
3.5.17.4
\fIFormat of the clear user data block\fR
.sp 9p
.RT
.PP
The 128 or less characters from the clear user data field received from
the remote DTE shall be sent. The clear user data field is only allowed
in conjunction with the fast select facility.
.RT
.sp 1P
.LP
3.5.18
\fIStandard format of the \fR \fIPAD identification PAD service\fR
\fIsignal\fR
.sp 9p
.RT
.PP
The characters that will comprise this \fIPAD service\fR signal will be
network dependent, but would probably indicate the PAD identity and port
identity.
.RT
.sp 1P
.LP
3.5.19
\fIStandard format of the \fR \fIerror PAD service signal\fR
.sp 9p
.RT
.PP
The characters 4/5 (E) 5/2 (R) 5/2 (R) will be sent, followed by
other characters which are for further study.
.RT
.sp 1P
.LP
3.5.20
\fIFormat of \fR \fIpadding characters\fR
.sp 9p
.RT
.PP
The padding character will be 0/0 (NUL) or the equivalent duration of binary\
1 according to the particular network.
.RT
.sp 1P
.LP
3.5.21
\fIStandard format of the \fR \fIconnected PAD service signal\fR
.sp 9p
.RT
.PP
The \fIconnected PAD service\fR signal will, in the following order,
consist of the following elements:
.RT
.LP
\(em
<optional called DTE address block> <formatting characters>
.LP
\(em
<optional facility block> <formatting characters>
.LP
\(em
<optional called user data field (see \(sc\ 3.5.21.1)>
<formatting characters>
.LP
\(em
<character 4/3 (C) 4/15 (O) 4/13 (M)> <formatting
characters>
.PP
The called DTE address block will consist of numeric characters
from IA5. The optional facility block will be as given in \(sc\ 3.5.22.2
below. It is for further study if the formatting characters will be 2/0\
(SP) or the
format effector.
.sp 1P
.LP
3.5.21.1
\fIStandard format of the called user data field\fR
.sp 9p
.RT
.PP
The 124 or less characters from the called user data field received from
the remote DTE shall be sent. The called user data field is only allowed
in conjunction with the fast select facility.
.RT
.sp 1P
.LP
3.5.22
\fIStandard format of the \fR \fIincoming call PAD service\fR
\fIsignal\fR
.sp 9p
.RT
.PP
The standard format of the \fIincoming call PAD service\fR \| signal
will, in the following order, consist of the following elements:
.RT
.LP
\(em
<calling DTE address block> <formatting characters>
.LP
\(em
<optional facility block> <formatting character>
.LP
\(em
<call data block> <formatting characters>
.LP
\(em
<characters 4/3 (C) 4/15 (O) 4/13 (M)>
.sp 1P
.LP
3.5.22.1
\fIStandard format of the \fR \fIcalling DTE address block\fR
.sp 9p
.RT
.PP
The standard format of the calling DTE address block is for further study.
.bp
.RT
.sp 1P
.LP
3.5.22.2
\fIStandard format of the \fR \fIoptional facility block\fR
.sp 9p
.RT
.PP
The standard format of the facility block is as follows:
\v'3p'
.RT
.LP
<facility block> :: = <FAC:> <facility string>
.LP
<FAC:> :: = <IA5 character 4/6 (F), 4/1 (A), 4/3 (C), 3/10 (:),
2/0\ (SP)>
.LP
<facility\ string>\ ::\ =
One or more facility indication codes
separated by character 2/12 (,). For
facility indication codes see Table 4/X.28
and\ \(sc\ 3.5.15.1.
.PP
The facility block is supressed if no facilities are present in
the incoming call.
.sp 1P
.LP
3.5.22.3
\fIStandard format of the \fR \fIcall data block\fR
.sp 9p
.RT
.PP
The 12 or less characters, or 124 or less characters in conjunction with
the fast select facility, from the call data field received from
the remote DTE shall be sent.
.RT
.sp 1P
.LP
3.5.23
\fIStandard format of the \fR \fIprompt PAD service signal\fR
.sp 9p
.RT
.PP
The standard format of the \fIprompt PAD service\fR \| signal is the
character 2/10\|(*) following a \fIformat effector\fR .
.PP
\fINote\fR \ \(em\ For an interim period, other characters are permitted.
.RT
.sp 1P
.LP
3.5.24
\fIStandard format of the \fR \fIcharacter deleted PAD service\fR
\fIsignal\fR
.sp 9p
.RT
.PP
Depending on the value of parameter 19, the following will
apply:
.RT
.LP
Value\ 0:
no \fIPAD service\fR signal will be sent;
.LP
Value\ 1:
the character 5/12 (\ ) will be sent; see note
.LP
Value\ 2:
the characters 0/8 (BS) 2/0 (SP) 0/8 (BS) will be
sent;
.LP
Value\ 8,\ 32\(hy126:
one character from International Alphabet
No.\ 5 will be sent.
.PP
\fINote\fR \ \(em\ Alternatively the character 2/15 (/) may be used by
some networks.
.sp 1P
.LP
3.5.25
\fIStandard format of the \fR \fIline deleted PAD service\fR
\fIsignal\fR
.sp 9p
.RT
.PP
Depending on the value of parameter 19, the following will
apply:
.RT
.LP
Value\ 0:
no \fIPAD service\fR \| signal will be sent;
.LP
Value\ 1,\ 8,\ 32\(hy126:
the characters 5/8 (X), 5/8 (X), 5/8 (X) will be sent followed by the
format effector;
.LP
Value\ 2:
the characters 0/8 (BS), 2/0 (SP), 0/8 (BS) will be
sent the number of times equal to the number of
graphic characters being deleted from the buffer.
.sp 1P
.LP
3.5.26
\fIStandard format of the \fR \fIparity error PAD service\fR
\fIsignal\fR
.sp 9p
.RT
.PP
The standard format is for further study.
.RT
.sp 1P
.LP
3.5.27
\fIStandard format of the \fR \fIpage wait PAD service signal\fR
.sp 9p
.RT
.PP
The characters 0/13 (CR) 5/0 (P) 4/1 (A) 4/7 (G) 4/5 (E) will be
sent.
.RT
.sp 1P
.LP
3.5.28
\fIFormat of the \fR \fIpage wait cancellation character\fR
.sp 9p
.RT
.PP
The character X\(hyON will be sent.
.RT
.sp 1P
.LP
3.5.29
\fIStandard format of the \fR \fIreselection PAD service signal\fR
.sp 9p
.RT
.PP
The standard format of the \fIreselection PAD service\fR \| signal will,
in the following order, consist of the following element:
.RT
.LP
\(em
<character 5/4 (T) 5/2 (R) 4/1 (A) 4/14 (N) 5/3 (S) 4/9 (F) 4/5 (E) 5/2\
(R) 2/0\ (SP) 5/4\ (T) 4/15\ (O) 3/10\ (:)> <formatting character>
.LP
\(em
<reselected DTE address block> <formatting character>
.LP
\(em
<optional facility block> <character> <note>
.bp
.PP
\fINote\ 1\fR \ \(em\ the optional facility block contains the facilities
included by the PAD in the \fICall Request Packet\fR sent to the reselected
DTE.
The format of the optional facility block is identical to the one of the
\fIincoming call PAD service\fR signal.
.PP
\fINote\ 2\fR \ \(em\ if requested in the \fIselection PAD command\fR signal
for the original call or in the \fIreselection PAD service\fR signal for
the reselected
call(s), the PAD will send the charging information before transmitting the
\fIreselection PAD service\fR signal (see \(sc\ 3.6.\ iii) of Recommendation\
X.29).
.PP
\fINote\ 3\fR \ \(em\ the format of charging information is network dependent
(see \(sc\ 3.5.17.2).
.RT
.sp 1P
.LP
3.6
\fIEditing functions in the PAD\fR
.sp 9p
.RT
.PP
The PAD provides functions for the start\(hystop mode DTE to edit
characters input to the PAD in \fIPAD command\fR signals before being processed
by the PAD. The functions provided are:
.RT
.LP
a)
character delete,
.LP
b)
line delete,
.LP
c)
line display.
.PP
Optionally available in some PADs are identical functions for use by the
start\(hystop mode DTE during the \fIdata transfer\fR state. When the value
of parameter\ 15 is set to\ 0 no editing is available during the \fIdata
transfer\fR
state.
.PP
When the value of parameter 15 is set to 1 editing is provided during the
\fIdata transfer\fR state (see \(sc\ 4.17).
.PP
The user may also have the ability in some PAD implementations to
select the character used to effect each of the above functions by setting
the value of parameters\ 16, 17 and\ 18 and to choose if and in what format
the PAD will respond to the editing characters by setting the value of
parameter\ 19
appropriately.
.PP
The procedures for editing described in this section apply to both
\fIPAD command\fR and \fIdata transfer\fR state (when provided).
.RT
.sp 1P
.LP
3.6.1
\fIEditing buffer\fR
.sp 9p
.RT
.PP
To perform the functions of editing, the PAD provides temporary
storage of characters in an editing buffer.
.RT
.sp 1P
.LP
3.6.1.1
\fIEditing buffer size\fR \fIin PAD command state\fR
.sp 9p
.RT
.PP
In the \fIPAD command\fR \| state the size of the editing buffer will be
sufficient to contain the longest mandatory \fIPAD command\fR signal permissible
in this Recommendation.
.RT
.sp 1P
.LP
3.6.1.2
\fIEditing buffer size in data transfer state\fR
.sp 9p
.RT
.PP
In the \fIdata transfer\fR \| state the size of the editing buffer is
network dependent but will not be smaller than the full packet size and will
not be smaller than the value of parameter 10 plus one. It should be noted
however, that in some networks the size of the editing buffer may be limited
to a maximum of 128\ octets.
.RT
.sp 1P
.LP
3.6.1.3
\fIImpact of editing on data forwarding conditions\fR
.sp 9p
.RT
.PP
In the \fIdata transfer\fR \| state, characters entered into the editing
buffer will be forwarded in a complete packet sequence when any of the
data
forwarding conditions described in \(sc\ 4.4 and Recommendation X.29, \(sc\
2.1 occurs, except that:
.RT
.LP
a)
the PAD will not take account of the value of the idle time
delay defined by the value of parameter\ 4;
.LP
b)
data forwarding on full packet will be suspended.
.PP
Whenever more than enough data has been received to fill the
editing buffer, one full packet will be forwarded. The remaining characters
will be placed in the beginning of the editing buffer and editing of these
characters remains possible.
.PP
Once a packet has been forwarded, characters included in it can no
longer be edited by the start\(hystop mode DTE by use of the PAD editing
functions.
.RT
.sp 1P
.LP
3.6.2
\fIProcedures for editing\fR
.sp 9p
.RT
.PP
The procedures for editing \fIPAD command\fR \| signals and user data
(when this facility is provided) use PAD parameters as defined in
Recommendation\ X.3.
.bp
.RT
.sp 1P
.LP
3.6.2.1
\fIProcedure for character delete editing function\fR
.sp 9p
.RT
.PP
The character delete editing function is performed when the PAD
receives a \fIcharacter delete\fR character or a series of \fIcharacter
delete\fR
characters from the start\(hystop mode DTE. The receipt of each \fIcharacter
delete\fR character causes the last character currently in the editing
buffer to be
deleted.
.PP
Subsequently, if the value of parameter 6 is not set to 0, if the
value of parameter\ 19 is set to 2 or 8 and a graphic character is removed
from the editing buffer, or, if the value of parameter\ 19 is set to 1
or\ 32\(hy126, and a character is removed from the editing buffer, the
\fIcharacter deleted PAD\fR
\fIservice\fR signal will be sent by the PAD. The standard format of the
\fIcharacter deleted PAD service\fR signal is given in \(sc\ 3.5.24 above.
.PP
The \fIcharacter delete\fR \| character when user selectable is determined
by the value of parameter\ 16. The default value of parameter\ 16 or the
\fIcharacter delete\fR character when not user selectable is the character
7/15\ (DEL).
.RT
.sp 1P
.LP
3.6.2.2
\fIProcedure for line delete editing function\fR
.sp 9p
.RT
.PP
The line delete editing function is performed when the PAD receives a \fIline
delete\fR \| character from the start\(hystop mode DTE. The receipt of
the
\fIline delete\fR character causes the deletion of the current contents of the
editing buffer.
.PP
The PAD will transmit, if parameter 6 and parameter 19 are not set
to\ 0 and the editing buffer is not empty, a \fIline deleted PAD service\fR
signal.
.PP
The \fIline delete\fR \| character when user selectable is determined by
the value of parameter\ 17. The default value of parameter\ 17 or the \fIline\fR
\fIdelete\fR character when not user selectable is the character\ 1/8\ (CAN).
.RT
.sp 1P
.LP
3.6.2.3
\fIProcedure for line display editing function\fR
.sp 9p
.RT
.PP
The line display editing function is performed when the PAD
receives a \fIline display\fR \| character from the start\(hystop mode DTE.
.PP
The receipt of the \fIline display\fR \| character causes the PAD to
transmit
to the start\(hystop mode DTE a format effector followed by the characters
currently stored in the editing buffer.
.PP
The \fIline display\fR \| character when user selectable is determined by
the value of parameter\ 18. The default value of parameter\ 18 or the \fIline\fR
\fIdisplay\fR character when not user suitable is the character\ 1/2\ (DC2).
.RT
.sp 1P
.LP
3.7
\fIProcedure for \fR \fIrequest of status of the virtual call\fR
.sp 9p
.RT
.PP
The start\(hystop mode DTE may, if parameter 6 is not set to 0,
enquire whether a virtual call exists by sending the \fIstatus PAD\fR command
signal to the PAD. The PAD will respond by sending the \fIstatus engaged\fR or
\fIstatus free PAD\fR service signal to the DTE. The format of the PAD command
signal and the standard format of the PAD service signals is given in \(sc\(sc\
3.5.10 and\ 3.5.11 respectively.
.RT
.sp 2P
.LP
\fB4\fR \fBProcedures for the exchange of user data between a\fR
\fBstart\(hystop mode DTE and a PAD\fR
.sp 1P
.RT
.PP
The procedures described apply during the \fIdata transfer\fR state of
the interface to a start\(hystop mode DTE.
.RT
.sp 1P
.LP
4.1
\fIData transfer state\fR
.sp 9p
.RT
.PP
After receipt of the \fIconnected\fR \| or \fIincoming call PAD service\fR
\| signal, the interface shall be in the \fIdata transfer\fR state and
will remain in that state, unless it escapes as described in \(sc\ 4.9
below, until the virtual
call is cleared by the PAD or by the start\(hystop mode DTE as described in
\(sc\ 3.2.2 above.
.PP
If parameters 1, 12, 15 and 22 when implemented are set to\ 0,
during the \fIdata transfer\fR \| state any character sequence may be transmitted
by the start\(hystop mode DTE for delivery to the remote DTE. If parameter\
1 is not set to\ 0, the PAD recall character selected by the value of parameter\
1 can
only be transferred by following the procedure described in
\(sc\ 4.9.1.1 below.
.bp
.PP
If parameter 12 is set to 1, characters 1/1 (DC1) and 1/3 (DC3) are
unable to be transferred to the remote DTE, if parameter\ 15 is set to\ 1 the
characters assigned for editing functions are unable to be transferred
to the remote DTE; and if parameter 22 when implemented is not set to\
0, the
character 1/1 (DC1) is unable to be transferred to the remote DTE.
.PP
The values of other parameters may affect the characters which may be transferred
during the \fIdata transfer\fR state.
.RT
.sp 1P
.LP
4.2
\fIData from the start\(hystop mode DTE received by the PAD\fR
.sp 9p
.RT
.PP
Characters received from the start\(hystop mode DTE are defined as
consisting of all the bits received between, but not including, the start
and stop bits. The action of the PAD with respect to the parity bit (bit\
8) of all characters received is described in \(sc\ 2.1 above.
.RT
.sp 1P
.LP
4.3
\fIDelivery of user data to the start\(hystop mode DTE\fR
.sp 9p
.RT
.PP
Data received by the PAD for delivery to the start\(hystop mode DTE
will be treated as contiguous octets. Each octet will be transmitted to the
start\(hystop mode DTE at the data signalling rate appropriate to the start\(hystop
mode DTE. The action of the PAD with respect to bit\ 8 (parity) of all
characters transmitted is described in \(sc\ 2.1 above.
.PP
Start and stop bits will be added to the characters in accordance
with Recommendation\ X.4, except that the number of stop bits will be as
follows. If the PAD is operating at 110\ bit/s, two stop bits will be
transmitted. At any other speed, one stop bit will be transmitted.
.PP
The data will be transmitted to the start\(hystop mode DTE at the
earliest opportunity permitted by the interleaving rules (see \(sc\ 4.19).
.RT
.sp 1P
.LP
4.4
\fIData forwarding conditions\fR
.sp 9p
.RT
.PP
A packet will be forwarded subject to flow control, whenever more than
enough data has been received from the start\(hystop mode DTE to fill a
packet after the last packet was forwarded if the value of parameter\ 15
is set to\ 0. A packet will also be forwarded when the maximum assembly
timer delay
.PP
period, which starts upon receipt by the PAD of the first character to be
assembled into a packet, elapses. The value of the time\(hyout, when implemented,
is network dependent and will be greater than or equal to 15\ minutes.
.PP
In addition, the start\(hystop mode DTE may indicate to the PAD that a
packet should be forwarded, subject to flow control, whenever it performs
any one, or more, of the following:
.RT
.LP
a)
Allows the idle time delay period (see parameter 4 in
Table\ 1/X.3), after the transmission of the previous character
to the PAD, to elapse without sending a character. If, due to
flow control constraints, the packet cannot be forwarded,
characters from the start\(hystop mode DTE will continue to be
added to the packet until flow control permits the packet to be
forwarded or the packet becomes full. The start\(hystop mode DTE
may be advised (see \(sc\(sc\ 4.5 and 4.6\ below) if this latter
condition occurs. This forwarding condition does not apply if
the value of parameter\ 15 is set to\ 1.
.LP
b)
Transmits one of the data forwarding character (see
parameter\ 3 in Table\ 1/X.3). The character will be included in
the data field of the packet it delimits before the packet is
forwarded. In case the forwarding character is the
character\ 0/13 (CR) and the value of parameter\ 13 is set to 6
or\ 7, the character\ 0/10\ (LF) will be included in the same
complete packet sequence as the character\ 0/13\ (CR) and will
delimit it.
.LP
c)
Transmits the \fIbreak\fR \| signal when parameter 7 is set to any
value except\ 0.
.LP
d)
Transmits the first character of a \fIPAD command\fR \| signal
after the interface has entered a \fIwaiting for command\fR state
as described in \(sc\ 4.9.1\ below.
.LP
e)
If the value of parameter 15 is set to one, data forwarding
will take place as described in \(sc\ 3.6.1.3.
.LP
.sp 1P
.LP
4.5
\fIProcedure for the PAD to indicate to the start\(hystop mode DTE\fR ,
\fIby means of a PAD service signal, a temporary inability to\fR \fIaccept
additional information\fR
.sp 9p
.RT
.PP
The procedure to enable the PAD to indicate a temporary inability to receive
additional characters and to subsequently indicate that characters will
be accepted, using PAD service signals, is for further study.
.PP
This procedure will not operate if parameter 6 is set to\ 0.
.bp
.RT
.sp 1P
.LP
4.6
\fIProcedures for transmission of X\(hyON and X\(hyOFF by the PAD\fR \v'3p'
.sp 9p
.RT
.PP
4.6.1
If parameter 5 is set to 1, the following ancillary
device control procedure applies:
.PP
The PAD will send the X\(hyON character to the DTE as soon as the
interface enters the \fIdata transfer\fR \| state. The character 1/1\ (DC1)
will be
transmitted by the PAD as the X\(hyON character.
.PP
The PAD will send the X\(hyOFF character to the start\(hystop mode DTE
when it is incapable of receiving more than M\ characters from the ancillary
device at the start\(hystop mode DTE and another character is received from the
DTE. The PAD will also send the X\(hyOFF character before the interface leaves
the \fIdata transfer\fR state. The character 1/3\ (DC3) will be transmitted
by the PAD as the X\(hyOFF character.
.PP
When the PAD is again able to receive at least M\ +\ 1 characters from
the start\(hystop mode DTE, it will send the X\(hyON character to that
DTE.
.RT
.PP
4.6.2
If parameter 5 is set to 2, the following flow control procedure applies:
.PP
The PAD will send the X\(hyON character to DTE as soon as the
interface enters the \fIPAD waiting\fR state (state\ 5), after link initialization.
.PP
The PAD will send the X\(hyOFF character to the start\(hystop mode DTE,
when it is incapable of receiving more than M characters from the start\(hystop
mode
DTE and another character is received from the DTE, in either state\ 5,
6, 7, 9 or\ 10.
.PP
When the PAD is again able to receive at least M\ +\ 1 characters from
the start\(hystop mode DTE, it will send the X\(hyON character to that
DTE.
.PP
The PAD will not send the X\(hyOFF character to the start\(hystop mode
DTE other than as specified in the above paragraph.
.PP
\fINote\fR \ \(em\ Some networks may send the X\(hyON character to the
start\(hystop mode DTE when the interface enters either state\ 5, 6, 7,
9 or\ 10 from any other state.
.RT
.PP
4.6.3
The value of M is for further study.
.sp 2P
.LP
4.7
\fIProcedures for reset\fR
.sp 1P
.RT
.sp 1P
.LP
4.7.1
\fIReset by the DTE\fR
.sp 9p
.RT
.PP
The start\(hystop mode DTE shall send a \fIreset PAD command\fR \| signal
to the PAD when it wishes to reset the virtual call.
.RT
.LP
a)
The \fIbreak\fR \| signal (see \(sc 3.1.2 above) will be recognized by
the PAD as a \fIreset PAD command\fR \| signal if parameter\ 7 is
set to\ 2.
.LP
b)
Alternatively the start\(hystop mode DTE may request reset by
escaping from the \fIdata transfer\fR state and sending a \fIreset\fR
\fIPAD command\fR signal according to the procedure of \(sc\ 4.9.2.3
below.
.sp 1P
.LP
4.7.2
\fIIndication of \fR \fIreset by the PAD\fR
.sp 9p
.RT
.PP
If the virtual call is reset by the packet mode DTE, by the remote start\(hystop
mode DTE connected via a PAD or by the network, the PAD will send a \fIreset
PAD service\fR signal, if the value of parameter\ 6 is not set to\ 0, to
the start\(hystop mode DTE. The \fIPAD service\fR signal will indicate
the cause of the
reset.
.PP
The following reset causes will be indicated to the start\(hystop mode
DTE:
.RT
.LP
a)
the remote DTE has reset the virtual call; the standard
format is given in \(sc\ 3.5.7 above;
.LP
b)
a local procedure error has occurred; the standard format is
given in \(sc\ 3.5.7 above;
.LP
c)
network congestion has occurred; the standard format is
given in \(sc\ 3.5.7 above.
.LP
d)
a remote procedure error has occurred; the standard format is given in
\(sc\ 3.5.7 above.
.PP
When parameter 6 is set to 0 the PAD is unable to indicate to the start\(hystop
mode DTE that a reset has occurred.
.sp 1P
.LP
4.8
\fIProcedure for \fR \fIindication of break\fR
.sp 9p
.RT
.PP
The PAD will inform the start\(hystop mode DTE that an incoming
\fIindication of break PAD message\fR \| has been received by the PAD (see
Recommendation\ X.29) by sending the \fIbreak\fR signal (see \(sc\ 3.1.2
above).
.bp
.RT
.LP
.sp 1P
.LP
4.9
\fIEscape from the data transfer state\fR \v'3p'
.sp 9p
.RT
.PP
4.9.1
During the \fIdata transfer\fR \| state, the start\(hystop mode DTE may
escape from that state by transmitting a \fIPAD recall\fR signal to the PAD. On
detection of the \fIPAD recall\fR signal, the interface will enter the
\fIwaiting\fR \fIfor command\fR state. On entering the \fIwaiting for command\fR
state, delivery of any data characters to the start\(hystop mode DTE will
be delayed until the
interface returns to the \fIdata transfer\fR state.
.PP
If parameter 1 is set to 1, the PAD will recognize the character 1/0\ (DLE)
as the \fIPAD recall\fR \| signal from the start\(hystop mode DTE.
.PP
If parameter 1 is set to a decimal value from 32 to 126, the PAD will recognize
the binary representation of the decimal value as the \fIPAD recall\fR
signal from the start\(hystop mode DTE.
.PP
If parameter 7 is set to 8, the \fIbreak\fR \| signal may be used as the
\fIPAD recall\fR \| signal from the \fIdata transfer\fR state, allowing
for escape from the \fIdata transfer\fR state without loss of character
transparency.
.PP
If parameter 6 is set to 5 the \fIprompt PAD service\fR \| signal will be
transmitted by the PAD.
.PP
On receipt of the next character from the start\(hystop mode DTE, the PAD
will act in accordance with one of the following conditions:
.RT
.LP
a)
If the character is the \fIPAD recall\fR \| character the
interface
will immediately return to the \fIdata transfer\fR state. This
character will be treated as user data.
.LP
b)
If the character received is the \fIPAD command signal\fR \fIdelimiter\fR
\| [characters 2/11\ (+) or 0/13\ (CR)] the PAD will not
transfer it and the interface will return to the \fIdata transfer\fR
state.
.LP
c)
If the character received is in columns 2 to 7 of
International Alphabet No.\ 5, excluding the characters 2/0\ (SP),
2/11\ (+) [see \(sc\ 4.9.1\ b) above], 7/15\ (DEL) and the \fIPAD recall\fR
character, the interface will enter the \fIPAD command\fR state.
Characters\ 2/0\ (SP) and 7/15\ (DEL) will be ignored. Entering
the \fIPAD command\fR state is a data forwarding condition and data
will be sent to the packet mode DTE as described in \(sc\ 4.4
above.
.LP
d)
If the character is not covered above the action by the PAD
is for further study.
.PP
If the \fIPAD command\fR \| signal delimiter is not received within R
seconds of the interface entering the \fIPAD command\fR state, or an invalid
\fIPAD\fR \fIcommand\fR signal is received, the PAD will transmit an \fIerror
PAD service\fR
signal, when parameter\ 6 is not set to\ 0, indicating that an error has
occurred. Following transmission of the \fIerror PAD service\fR signal the
interface will be in the \fIdata transfer\fR state. The value of R is for
further study but will not be less than\ 60\ s.
.PP
If a valid \fIPAD command\fR \| signal is received the interface will, if
parameter\ 6 is not set to\ 0, subsequently enter the \fIPAD service\fR
signal state, and on transmission of the last character of the \fIPAD service\fR
signal will
enter the \fIPAD waiting\fR state or the \fIdata transfer\fR state as appropriate.
If parameter\ 6 is set to\ 0, the interface will enter the \fIPAD waiting\fR
state or
the \fIdata transfer\fR state, as appropriate, following the transmission of a
\fIPAD command\fR signal or following the time\(hyout condition specified
above.
.RT
.PP
4.9.2
The ability to escape from the \fIdata transfer\fR \| state allows a
start\(hystop mode DTE to use the following \fIPAD command\fR signals and
procedures:
.sp 1P
.LP
4.9.2.1
\fIClearing\fR
.sp 9p
.RT
.PP
The procedure for clearing of the virtual call by the start\(hystop
mode DTE sending a \fIclear request PAD command\fR signal is described in
\(sc\ 3.2.2.1\ a).
.RT
.sp 1P
.LP
4.9.2.2
\fIRequest for \fR \fIstatus of the virtual call\fR
.sp 9p
.RT
.PP
The procedure for requesting the status of the virtual call by the start\(hystop
mode DTE sending a \fIstatus PAD command\fR signal, is described in
\(sc\ 3.7.
.RT
.sp 1P
.LP
4.9.2.3
\fIReset\fR
.sp 9p
.RT
.PP
The start\(hystop mode DTE may request a resetting of the virtual call
by sending a \fIreset PAD command\fR \| signal to the PAD. The format of
the \fIreset\fR \fIPAD command\fR signal is given in \(sc\ 3.5.12 above.
.PP
The PAD will acknowledge the \fIreset PAD command\fR \| signal, if
parameter\ 6 is not set to\ 0, by transmitting the \fIacknowledgement PAD
service\fR signal.
.bp
.RT
.sp 1P
.LP
4.9.2.4
\fIInterrupt\fR
.sp 9p
.RT
.PP
The start\(hystop mode DTE may request that an \fIinterrupt\fR \| packet
(with the interrupt user data field appropriately coded, see
Recommendation\ X.29) is sent by the PAD by sending an \fIinterrupt PAD
command\fR signal to the PAD. The format of the \fIinterrupt PAD command
signal\fR is given
in \(sc\ 3.5.13 above.
.PP
The PAD will acknowledge the \fIPAD command\fR \| signal, if parameter
6 is not set to\ 0, by transmitting the \fIacknowledgement PAD service\fR
signal.
.RT
.sp 1P
.LP
4.9.2.5
\fISetting, setting and reading, and reading PAD parameter\fR
\fIvalues after having entered the data transfer state\fR
.sp 9p
.RT
.PP
The start\(hystop mode DTE shall be able to send the following \fIPAD\fR
\fIcommand\fR \| signals to set, set and read, and read PAD parameter
values:
.RT
.LP
a)
\fIprofile selection PAD command\fR signal;
.LP
b)
\fIset PAD command\fR signal;
.LP
c)
\fIset and read PAD command\fR signal;
.LP
d)
\fIread PAD command\fR signal.
.PP
As an option, a PAD may enable the start\(hystop mode DTE to send the following
\fIPAD command\fR signals to read or set and read the remote PAD
parameter values:
.LP
b)
\fIread remote PAD command\fR signal;
.LP
c)
\fIset and read remote PAD command\fR signal.
.PP
The procedures for sending the above \fIPAD command\fR signals are
described in \(sc\(sc\ 3.3 and\ 3.4 above.
.sp 1P
.LP
4.9.2.6
\fIProcedure when parameter 6 is set to 0\fR
.sp 9p
.RT
.PP
In all cases of the procedures given, when parameter 6 is set to 0, the
\fIPAD service\fR \| signal state (state\ 8) is bypassed and the interface
will
enter \fIPAD waiting\fR state or the \fIdata transfer\fR state as appropriate.
.RT
.sp 1P
.LP
4.10
\fIEcho\fR
.sp 9p
.RT
.PP
If parameter 2 is set to 1, the following procedures will apply:
.PP
Received characters not masked by parameter\ 20 will be echoed to the start\(hystop
mode DTE at the earliest opportunity permitted by the
interleaving rules (see \(sc\ 4.19).
.PP
In the case where the PAD cannot handle and ignores a data character coming
from the start\(hystop mode DTE, e.g.\ because of flow control constraints,
the PAD will not echo the characters.
.PP
Echoing of editing characters will not be masked if editing is not
enabled.
.RT
.sp 1P
.LP
4.11
\fISelection of the procedure on receipt of the break signal\fR
\fIfrom the start\(hystop mode DTE\fR
.sp 9p
.RT
.PP
The start\(hystop mode DTE, by means of parameter 7, will be able to select
the state of the interface and which procedure the PAD will perform when
the PAD receives the \fIbreak\fR signal from the start\(hystop mode DTE.
The
start\(hystop mode DTE may select any one of the following:
.RT
.LP
a)
If parameter 7 is set to 0, the state of the interface
remains the same and no action is taken by the PAD.
.LP
b)
If parameter 7 is set to 1, the state of the interface
remains the same and the PAD causes an \fIinterrupt\fR packet, (with
the interrupt user data field appropriately coded) to be
transmitted by the PAD (see Recommendation\ X.29).
.LP
c)
If parameter 7 is set to 2, the state of the interface
remains the same and the PAD causes the virtual call to be reset
(see Recommendation\ X.29).
.LP
d)
If parameter 7 is set to 21, the state of the interface
remains the same, the PAD discards all data received for
delivery to the start\(hystop mode DTE, and the PAD sends an
\fIinterrupt\fR packet (with the interrupt user data field
appropriately coded) followed by an \fIindication of break PAD\fR
\fImessage\fR (see Recommendation\ X.29).
.bp
.LP
e)
If parameter 7 is set to 8, the interface will escape from
the \fIdata transfer\fR state and will enter the \fIwaiting for\fR \fIcommand\fR
state.
.LP
f
)
If parameter 7 is set to 5, the state of the interface
remains the same, the PAD sends an \fIinterrupt\fR packet (with the
interrupt user data field appropriately coded), followed by
an \fIindication of break PAD\fR message.
.PP
Other procedures which may be selected by the start\(hystop mode DTE are
for further study.
.PP
\fINote\ 1\fR \ \(em\ The receipt by the PAD of a \fIbreak\fR \| signal
is a packet
forwarding condition except when parameter\ 7 is set to\ 0.
.PP
\fINote\ 2\fR \ \(em\ The receipt of a \fIbreak\fR \| signal by the PAD
when there is no virtual call established is ignored and the PAD takes
no action.
.RT
.sp 1P
.LP
4.12
\fISelection of padding characters to be inserted after\fR
\fIthe character 0/13\ (CR)\fR
.sp 9p
.RT
.PP
The start\(hystop mode DTE, by means of parameter 9, will be able to select
the number of padding characters that will be inserted after each
character 0/13\ (CR) transmitted or echoed to it. The value selected will
also apply to the number of padding characters transmitted after the character
0/10\ (LF) of the \fIformat effector\fR as described in \(sc\ 3.5.2 above.
.PP
Other padding sequences and other padding rules are for further
study.
.RT
.sp 1P
.LP
4.13
\fISelection of line folding\fR
.sp 9p
.RT
.PP
The start\(hystop mode DTE, by means of parameter 10, will be able to select
line folding and specify the maximum number\ (L) of graphic characters
that the PAD may send as a single line to the start\(hystop mode DTE.
.PP
When
line folding
is requested, the PAD will maintain a count (C) which is incremented by\
1 subsequent to the transmission of a
graphic character
including echoed characters, to the start\(hystop mode DTE.
.PP
The graphic characters are those shown in columns 2 to 7 of
International Alphabet No.\ 5, excluding the character 7/15\ (DEL).
.PP
If the value of C is equal to the value of L, and the next character to
be transmitted to the start\(hystop mode DTE is a graphic character, the
PAD
will transmit to the start\(hystop mode DTE a \fIformat effector\fR (see
\(sc\ 3.5.2
above) and set the value of\ C to\ 0.
.PP
The PAD will set the value of C to 0 when the PAD transmits the
character 0/13\ (CR) to the start\(hystop mode DTE.
.PP
The actions of the PAD after the transmission of the character 0/8
(BS) is for further study.
.PP
Line folding also applies to \fIPAD service\fR \| signals and the echo
of \fIPAD command\fR \| signals.
.RT
.LP
.sp 1P
.LP
4.14
\fIProcedure for the start\(hystop mode DTE to indicate to the PAD\fR
\fIa temporary inability to accept additional information\fR
.sp 9p
.RT
.PP
The start\(hystop mode DTE, by means of parameter 12, will be able to select
the use of X\(hyON and X\(hyOFF characters to
flow control
the PAD.
.PP
If the value of parameter 12 is set to 1 and the interface is in the \fIdata
transfer\fR \| state the following procedure applies:
.PP
The start\(hystop mode DTE may indicate a temporary inability to receive
additional characters from the PAD by transmitting the X\(hyOFF character
1/3\ (DC3).
.PP
Following transmission of the character 1/3 (DC3), the X\(hyOFF condition
will exist until the start\(hystop mode DTE indicates the ability to receive
additional characters from the PAD by transmitting the X\(hyON character
1/1\ (DC1).
.PP
While the X\(hyOFF condition exists, the PAD will not transmit characters
to the start\(hystop mode DTE.
.PP
The X\(hyOFF condition is cancelled when the interface leaves the \fIdata\fR
\fItransfer\fR \| state, and does not exist when the interface enters the
\fIdata\fR
\fItransfer\fR state.
.PP
The X\(hyON and X\(hyOFF characters will not be echoed regardless of the
value of parameter\ 2 and\ 20.
.bp
.RT
.sp 1P
.LP
4.15
\fISelection of linefeed insertion after carriage return\fR
.sp 9p
.RT
.PP
The start\(hystop mode DTE, by means of parameter 13, will be able to select
which procedure the PAD will perform during the \fIdata transfer\fR state
when it receives the character 0/13\ (CR) to be transmitted to the start\(hystop
mode DTE.
.PP
If parameter 13 is set to 0, the PAD takes no action.
.PP
If parameter 13 is set to 1, 5 or 7, the PAD will insert the
character 0/10\ (LF) after every character 0/13\ (CR) in the data stream
\fIto\fR the start\(hystop mode DTE.
.PP
If parameter 13 is set to 6 or 7, the PAD will insert the character
0/10\ (LF) after every character 0/13\ (CR) in the data stream \fIfrom\fR the
start\(hystop mode DTE.
.PP
If parameter 13 is set to 4, 5, 6 or 7 (and parameter 2 is set to 1) the
PAD will insert the character 0/10\ (LF) after the echo of a character
0/13\ (CR) to the start\(hystop mode DTE.
.PP
When this parameter includes the value 2, in combination with other
optional values, then the LF inserted after CR in the data stream from the
start\(hystop mode DTE will be placed in the editing buffer and may subsequently
be edited, if parameter 15 is set to\ 1.
.RT
.sp 1P
.LP
4.16
\fISelection of padding characters to be inserted after the\fR
\fIcharacter 0/10 (LF)\fR
.sp 9p
.RT
.PP
The start\(hystop mode DTE, by means of parameter 14, will be able to select
the number of padding characters that will be inserted after each
character 0/10\ (LF) transmitted or echoed to it during the \fIdata transfer\fR
state. The value selected will not apply to the number of padding characters
transmitted after the character 0/10\ (LF) of the \fIformat effector\fR
as described in \(sc\(sc\ 3.5.2 and\ 4.12 above.
.RT
.sp 1P
.LP
4.17
\fIEditing of user data\fR
.sp 9p
.RT
.PP
The editing functions described in \(sc 3.6 above may also apply
during the \fIdata transfer\fR state. The start\(hystop mode DTE by means of
parameter\ 15 may select whether or not to use the editing functions. The
start\(hystop mode DTE may select, by using parameters\ 16, 17, 18 the
character
used for each editing function provided by the PAD and by use of parameter\
19, select the response of the PAD to the editing characters (see
Recommendation\ X.3).
.RT
.sp 2P
.LP
4.18
\fIPage wait\fR
.sp 1P
.RT
.sp 1P
.LP
4.18.1
\fIGeneral\fR
.sp 9p
.RT
.PP
The start\(hystop mode DTE will be able to suspend the transmission of
additional characters to the start\(hystop mode DTE after a specified number
of
linefeeds have been transmitted by the PAD as determined by the value of
parameter\ 22 when the page wait condition occurs. The PAD will, if parameter\
6 is not set to\ 0, send to the start\(hystop mode DTE a \fIpage wait PAD
service\fR
signal. No further data will be sent until the page wait condition is
cancelled. The standard format of the \fIpage wait PAD service\fR signal is
described in \(sc\ 3.5.27.
.RT
.sp 1P
.LP
4.18.2
\fIPage wait cancellation\fR
.sp 9p
.RT
.PP
The PAD will cancel the page wait condition and after transmitting a format
effector resume normal transmission when any of the following
occur:
.RT
.LP
\(em
on receipt of any condition that resets the count of
linefeeds as described in \(sc\ 4.18.3;
.LP
\(em
on receipt of the
page wait cancellation character
(X\(hyON); or
.LP
\(em
on resetting parameter 22 to zero.
.sp 1P
.LP
4.18.3
\fIPage wait linefeed count reset\fR
.sp 9p
.RT
.PP
The count of linefeed will be reset to zero by the PAD when any of the
following occur:
.RT
.LP
\(em
after the format effector following the page wait
cancellation character;
.LP
\(em
on receipt of all data forwarding conditions;
.LP
\(em
on echoing linefeed in user input;
.LP
\(em
after the \fIline deleted PAD service\fR signal (with all
associated linefeeds) has been sent; or
.LP
\(em
on leaving the \fIPAD command\fR state (state 6) after all
associated linefeeds.
.PP
Other conditions for resetting the linefeed count are for further study.
.bp
.sp 1P
.LP
4.19
\fIInterleaving of echo and output\fR
.sp 9p
.RT
.PP
Character sent to start\(hystop DTE by the PAD are classified into
\fIecho characters\fR and \fIoutput characters\fR . The \fIecho characters\fR
are all
characters contained in the following:
.RT
.LP
a)
echoed received characters, either of a \fIPAD command\fR signal or of
user input;
.LP
b)
any line feed inserted after the echo of a carriage return, when Parameter\
13 has value\ 4, 5, 6 or\ 7 (see \(sc\ 4.15);
.LP
c)
the \fIcharacter deleted, line deleted\fR and \fIparity error PAD\fR
\fIservice\fR signals;
.LP
d)
a \fIformat effector\fR inserted as a result of line folding
initiated by some other echoed character (see \(sc\ 4.13);
.LP
e)
all characters generated in response to the \fIline display\fR character
(see \(sc\ 3.6.2.3).
.PP
All other characters sent to the start\(hystop DTE by the PAD are
\fIoutput characters\fR .
.PP
\fIEcho\fR and \fIoutput characters\fR shall be sent to the start\(hystop
DTE by the PAD in accordance with either the \fIbasic interleaving rules\fR
, see \(sc\ 4.19.1, or the \fIextended interleaving rules\fR , see \(sc\
4.19.2. The choice between rules is network dependent.
.RT
.sp 1P
.LP
4.19.1
\fIBasic interleaving rules\fR
.sp 9p
.RT
.PP
If any \fIecho character\fR is waiting to be sent to the start\(hystop
DTE by the PAD, it shall be sent immediately.
.PP
If any \fIoutput character\fR is waiting to be sent to the start\(hystop
DTE by the PAD, and if no \fIecho character\fR is waiting, the \fIoutput
character\fR
shall be sent immediately.
.RT
.sp 1P
.LP
4.19.2
\fIExtended interleaving rules\fR
.sp 9p
.RT
.PP
Characters sent to the start\(hystop DTE by the PAD are grouped into \fIinterleaving
units\fR . An \fIinterleaving unit\fR either consists entirely of
\fIecho characters\fR or consists entirely of \fIoutput characters\fR .
.PP
An interleaving unit of \fIecho characters\fR is terminated by any data
forwarding condition, or by a \fIPAD command signal delimiter\fR .
.PP
A \fIPAD service\fR signal (which is not classified as echo), or a series
of \fIPAD service\fR signals generated in response to a single PAD command,
is an \fIinterleaving unit\fR .
.PP
Each complete packet sequence sent from the Packet mode DTE is whole number
of \fIinterleaving units\fR . How a complete packet sequence is divided
into one or more \fIinterleaving units\fR is network dependent.
.PP
\fINote\ 1\fR \ \(em\ A preferred division rule is that any line feed or
form feed
should terminate an \fIinterleaving unit\fR including any line feed
inserted if the value of parameter\ 13 is odd.
.PP
\fINote\ 2\fR \ \(em\ If only part of an \fIinterleaving unit\fR (output
or echo) is sent to the start\(hystop mode DTE, characters of the other
category (echo or
output) may be delayed indefinitely. This may be avoided by the use of
timers; details are for further study.
.RT
.sp 2P
.LP
\fB5\fR \fBFormats of additional PAD command signals and PAD service signals\fR
\fBavailable in the extended dialogue mode\fR
.sp 1P
.RT
.PP
In addition to the \fIPAD command\fR signals and \fIPAD service\fR signals
defined above (see \(sc\ 3.1.1 and \(sc\ 3.5 above), some networks may
support
additional capabilities in the extended dialogue mode. Additional PAD command
.PP
signal keywords, which are provisionally defined in Table\ 9/X.28, can
be used instead of the corresponding standard keywords. Some networks may
provide these keywords when the PAD is not in the extended dialogue mode.
.PP
Additional \fIPAD command\fR signals may be provided for:
.RT
.LP
a)
requesting the action associated with the break signal (see \(sc\ 5.1)
.LP
b)
indicating a network user identifier prior to establishing calls, or
terminating the use of a NUI (see \(sc\ 5.2)
.LP
c)
selecting a language for \fIPAD service\fR signals (see \(sc\ 5.3)
.LP
d)
requesting explanatory information on \fIPAD command\fR signals, PAD
parameters, standard profiles,\ etc.
.LP
(Note: This function must be provided if extended dialogue mode is supported)
(see \(sc\ 5.4)
.bp
.PP
Additional \fIPAD service\fR signals may be provided for:
.LP
a)
explanatory information as described above (see \(sc\ 5.5)
.LP
b)
prompting for additional information for certain \fIPAD\fI\fR
\fIcommand\fR signals. The formats and procedures are for further study.
.PP
When the PAD is in the extended dialogue mode, the parameter
reference number of a PAD parameter in the \fIread, set, set and read,
remote\fR \fIread\fR or \fIremote set and read PAD command\fR signals may
be replaced by the
abbreviated name shown in Table\ 8/X.28. The possible use of names to represent
PAD parameter value is for further study.
.LP
.sp 1
.ce
\fBH.T. [T9.28]\fR
.ce
TABLE\ 9/X.28
.ce
\fBPAD command signal keywords for extended dialogue mode\fR
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(42p) | cw(66p) | cw(90p) .
Standard keyword T{
Extended dialogue mode keyword(s)
T} PAD command signal name
_
.T&
lw(42p) | lw(66p) | lw(90p) .
None CALL Selection
_
.T&
lw(42p) | lw(66p) | lw(90p) .
CLR CLEAR clear request
_
.T&
lw(42p) | lw(66p) | lw(90p) .
INT INTERRUPT interrupt
_
.T&
lw(42p) | lw(66p) | lw(90p) .
PROF PROFILE profile selection
_
.T&
lw(42p) | lw(66p) | lw(90p) .
PAR? PAR PARAMETER READ read
_
.T&
lw(42p) | lw(66p) | lw(90p) .
RESET .\|.\|.\|. reset
_
.T&
lw(42p) | lw(66p) | lw(90p) .
SET .\|.\|.\|. set
_
.T&
lw(42p) | lw(66p) | lw(90p) .
SET? SETREAD set and read
_
.T&
lw(42p) | lw(66p) | lw(90p) .
STAT STATUS status
_
.T&
lw(42p) | lw(66p) | lw(90p) .
.\|.\|.\|. BREAK break
_
.T&
lw(42p) | lw(66p) | lw(90p) .
.\|.\|.\|. HELP help
_
.T&
lw(42p) | lw(66p) | lw(90p) .
.\|.\|.\|. LANG LANGUAGE language
_
.T&
lw(42p) | lw(66p) | lw(90p) .
.\|.\|.\|. NUI nui
_
.T&
lw(42p) | lw(66p) | lw(90p) .
RPAR? RREAD remote read
_
.T&
lw(42p) | lw(66p) | lw(90p) .
ICLR ICLEAR invitation to clear
_
.T&
lw(42p) | lw(66p) | lw(90p) .
RSET? RSETREAD remote set and read
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 9/X.28 [T9.28], p. 4\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.sp 1P
.LP
5.1
\fIFormat of the break PAD command signal\fR
.sp 9p
.RT
.PP
The \fIbreak PAD command\fR signal consists of the following
elements:
.RT
.LP
<break PAD command signal> :: = <BREAK>
.LP
where
.LP
<BREAK> :: = 4/2 (B) 5/2 (R) 4/5 (E) 4/1 (A) 4/1 (K)
.PP
The \fIbreak PAD command\fR signal requests the PAD to act as if it
had received the break signal from the start stop mode DTE. The action
depends on the value of PAD parameter\ 7, as defined in \(sc\ 4.11. However,
the interface will enter the \fIPAD waiting\fR state or \fIdata transfer\fR
state as appropriate
unless parameter\ 7 has the value\ 8 set, in which case the interface will
reenter the \fIwaiting for command\fR state.
.PP
\fINote\fR \ \(em\ Escape from data transfer state is not possible by using
this command.
.RT
.sp 1P
.LP
5.2
\fIFormat of the NUI ON and NUI OFF PAD command signals\fR
.sp 9p
.RT
.PP
The NUI ON command signal consists of the following elements:
.RT
.LP
command signal> :: <ID> <NUI string>
.LP
where
.LP
<ID> :: = 4/9 (I) 4/4 (D)
.PP
<NUI string> is optional but if present is as defined in
\(sc\ 3.5.15.1.1.
.PP
The NUI ON PAD \fIcommand\fR signal identifies an individual terminal user
to the PAD. This identification will apply for all subsequent calls until
either the access path is disconnected or a \fINUI OFF PAD command\fR signal is
received by the PAD.
.PP
If the prompting facility is provided, then the PAD may request
additional user input if required when the <NUI string> is omitted.
.PP
The NUI OFF PAD command signal consists of the following
elements:
.RT
.LP
<NUI OFF PAD command signal> :: = <IDOFF>
.LP
where
.LP
<IDOFF> :: = 4/9 (I) 4/4 (D) 4/15 (0) 4/6 (F) 4/6 (F)
.PP
The \fINUI OFF PAD command\fR signal indicates the termination of the use
of the NUI.
.sp 1P
.LP
5.3
\fIFormat of the language PAD command signal\fR
.sp 9p
.RT
.PP
The \fIlanguage PAD command\fR signal consists of the following
elements:
.RT
.LP
<language PAD command signal> :: = <LANG> <language string>
.LP
where
.LP
<LANG> :: = 4/12 (L) 4/1 (A) 4/14 (N) 4/7 (G)
.LP
<language\ string>\ ::\ =
an appropriate identifier for a
language or mode supported by the network for use in service signals.
.PP
The \fIlanguage PAD command\fR may be provided to give a simpler way to
set parameter\ 6 for a choice of language or mode.
.PP
If <language string> refers to a language which the network provides in
extended dialogue mode, then the value of parameter\ 6 is set to the
appropriate value (16\ or greater). If <language string> refers to a language
which the network provides in network dependent service signal formats, then
the value of parameter\ 6 may be set to the appropriate value from\ 8 to\ 15.
.PP
The format of <language string> and the availability of more than one language
is network dependent.
.PP
The need for selection of different languages for \fIPAD command\fR
signals is for further study.
.PP
\fINote\fR \ \(em\ If a network provides a language choice independent of
extended dialogue mode, the format of <language string> should provide for
identifying the mode and the language.
.bp
.RT
.sp 1P
.LP
5.4
\fIFormat of the help PAD command signal\fR
.sp 9p
.RT
.PP
The \fIhelp PAD command\fR signal consists of the following
elements:
.RT
.LP
<help PAD command signal> :: = <HELP> <help subject>
.LP
where
.LP
<HELP> :: = 4/8 (H) 4/5 (E) 4/12 (L) 5/0 (P)
.LP
<help\ subject> :: = identifier for the type of explanatory
information requested, as defined in Table\ 10/X.28.
.sp 1P
.LP
5.5
\fIStandard format of the help PAD service signal\fR
.sp 9p
.RT
.PP
The \fIhelp PAD service\fR signal consists of the following
elements:
.RT
.LP
<help PAD service signal> :: = <text>
.LP
where
.LP
<text> is network dependent and corresponds to the <help subject> requested
in the \fIhelp PAD command\fR signal, as defined in Table\ 10/X.28.
.LP
.sp 3
.ce
\fBH.T. [T10.28]\fR
.ce
TABLE\ 10/X.28
.ce
\fBHelp PAD command signal operands and results\fR
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(72p) | cw(132p) .
<help subject> (Note 2) T{
service signal contents
(Note 1)
T}
_
.T&
lw(72p) | lw(132p) .
none or HELP T{
description of help PAD command
T}
_
.T&
lw(72p) | lw(132p) .
LIST T{
list of available help subjects
T}
_
.T&
lw(72p) | lw(132p) .
COMMAND list of PAD command signals
_
.T&
lw(72p) | lw(132p) .
PARAMETER list of PAD parameters
_
.T&
lw(72p) | lw(132p) .
PARAMETER <reference> T{
description of referenced PAD parameter
T}
_
.T&
lw(72p) | lw(132p) .
PROFILES T{
list of available standard profiles
T}
_
.T&
lw(72p) | lw(132p) .
any PAD command T{
description of specified PAD command signal
T}
_
.T&
lw(72p) | lw(132p) .
PROFILE <reference> T{
name and parameter values of referenced standard profile
\fINote\ 1\fR
\ \(em\ The actual contents of the help \fIPAD service\fR
signal and the
amount of detail presented are network dependent.
.parag
\fINote\ 2\fR
\ \(em\ Some networks may provide help for additional subjects to those
listed.
.parag
T}
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau 10/X.28 [10.28], p. 5 \fR
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 5P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.ce 1000
ANNEX\ A
.ce 0
.ce 1000
(to Recommendation X.28)
.sp 9p
.RT
.ce 0
.ce 1000
\fBPAD command signals and PAD service signals\fR
.sp 1P
.RT
.ce 0
.ce
\fBH.T. [T11.28]\fR
.ce
TABLE\ A\(hy1/X.28
.ce
\fBPAD command signals\fR
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(48p) | cw(90p) | cw(90p) .
PAD command signal format Function T{
PAD service signal sent in response
(see note)
T}
_
.T&
lw(48p) | lw(90p) | lw(90p) .
STAT T{
To request status information regarding a virtual call connected
to the DTE
T} FREE or ENGAGED
_
.T&
lw(48p) | lw(90p) | lw(90p) .
CLR To clear down a virtual call T{
CLR CONF
or
CLR ERR (in the case of local procedure error)
T}
_
.T&
lw(48p) | lw(90p) | lw(90p) .
T{
PAR?
List of parameter references
T} T{
To request the current values of specified parameters
T} T{
PAR (list of parameter with their current values or INV)
T}
_
.T&
lw(48p) | lw(90p) | lw(90p) .
T{
SET?
List of parameter references and corresponding values
T} T{
To request changing or setting of the current values of the specified
parameters and to request the current values of specified parameters
T} T{
PAR (list of parameter with their current values or INV)
T}
_
.T&
lw(48p) | lw(90p) | lw(90p) .
PROF (identifier) T{
To give to PAD parameters a standard set of values
T} Acknowledgement
_
.T&
lw(48p) | lw(90p) | lw(90p) .
RESET To reset the virtual call Acknowledgement
_
.T&
lw(48p) | lw(90p) | lw(90p) .
INT T{
To transmit an \fIinterrupt\fR
packet
T} Acknowledgement
_
.T&
lw(48p) | lw(90p) | lw(90p) .
T{
SET
List of parameters with requested values
T} T{
To set or change parameter values
T} T{
Acknowledgement or PAR (list of invalid parameter reference followed
by INV)
T}
_
.T&
lw(48p) | lw(90p) | lw(90p) .
T{
\fISelection PAD command\fR
signal
T} To set up a virtual call Acknowledgement
_
.T&
lw(48p) | lw(90p) | lw(90p) .
ICLR T{
To invite remote PAD to clear down a virtual call
T} CLR PAD
_
.T&
lw(48p) | lw(90p) | lw(90p) .
T{
RPAR?
List of parameter references
T} T{
To request the current values of specified parameters in remote PAD
T} T{
RPAR (list of parameter references with their current values or INV)
T}
_
.T&
lw(48p) | lw(90p) | lw(90p) .
T{
RSET?
List of parameter references
T} T{
To request changing or setting of the current values of the specified
parameter(s) and to request the current value of specified parameters
T} T{
RPAR (list of parameter references with their current values or INV)
\fINote\fR
\ \(em\ \fIPAD service\fR
signals are not sent when parameter 6 is set to 0.
.parag
T}
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau A\(hy1/X.28 [11.28], p. 6 \fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [1T12.28]\fR
.ce
TABLE\ A\(hy2/X.28
.ce
\fBPAD service signals\fR
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(108p) | cw(120p) .
T{
Standard format of the PAD service signal
T} Explanation
_
.T&
lw(48p) | lw(60p) | lw(120p) .
RESET T{
DTE
1, 2 or 3 characters which represent the
T} T{
Indication that the remote DTE has reset the virtual call
T}
.T&
lw(48p) | lw(60p) | lw(120p) .
T{
ERR
d\*'ecimal value of the diagnostic code
T} T{
Indication of a reset of a virtual call due to local procedure
error
T}
.T&
lw(48p) | lw(60p) | lw(120p) .
NC (see Note 1) T{
Indication of a reset of a virtual call due to network congestion
T}
.T&
lw(48p) | lw(60p) | lw(120p) .
RPE T{
Indication of a reset of a virtual call due to remote procedure
error
T}
_
.T&
lw(48p) | lw(60p) | lw(120p) .
CLR See Table 6/X.28 Indication of clearing
_
.T&
lw(48p) | lw(60p) | lw(120p) .
CLR CONF Confirmation of clearing
_
.T&
lw(48p) | lw(60p) | lw(120p) .
See Note 7 \(em Indication of call connected
_
.T&
lw(48p) | lw(60p) | lw(120p) .
T{
The characters to be sent are network dependent
T} T{
PAD identification PAD service signal
T}
_
.T&
lw(48p) | lw(60p) | lw(120p) .
ERR T{
Indication that a \fIPAD command signal\fR
is in error
T}
_
.T&
lw(48p) | lw(60p) | lw(120p) .
See Note 2 Indication of incoming call
_
.T&
lw(48p) | lw(60p) | lw(120p) .
XXX T{
Indication of line delete function completed for printing terminals
(see Notes 3 and 4)
T}
_
.T&
lw(48p) | lw(60p) | lw(120p) .
See Note 8 T{
Indication of character delete function completed for printing
terminals
T}
_
.T&
lw(48p) | lw(60p) | lw(120p) .
PAGE T{
Indication that a page wait condition has occurred
T}
_
.T&
lw(48p) | lw(60p) | lw(120p) .
BS SP BS T{
Indication of character delete function completed for video
terminals (see Note 4)
T}
_
.T&
lw(48p) | lw(60p) | lw(120p) .
ENGAGED T{
Response to \fIstatus PAD command\fR
signal when a call has been
established
T}
_
.T&
lw(48p) | lw(60p) | lw(120p) .
FREE T{
Response to \fIstatus PAD command\fR
signal when a call is not
established
T}
_
.T&
lw(48p) | lw(60p) | lw(120p) .
PAR T{
Decimal value of parameter: Parameter value, INV, or list of
invalid parameters
T} T{
Response to \fIset and red PAD command\fR
signal and to \fIset PAD command\fR
signal if at least one parameter is invalid
T}
_
.T&
lw(48p) | lw(60p) | lw(120p) .
* T{
\fIPrompt PAD service\fR
signal
T}
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau A\(hy2/X.28 [1T12.28], p. 7\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [2T12.28]\fR
.ce
TABLE\ A\(hy2/X.28 \fI(cont.)\fR
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(108p) | cw(120p) .
T{
Standard format of the PAD service signal
T} Explanation
_
.T&
lw(48p) | lw(60p) | lw(120p) .
Format effector T{
\fIAcknowledgement PAD service\fR
signal
T}
_
.T&
lw(48p) | lw(60p) | lw(120p) .
TRANSFER TO T{
DTE address and facilities,
See Notes 5 and 6
T} T{
Indication that a called DTE reselection by the PAD is in
progress
T}
_
.T&
lw(48p) | lw(60p) | lw(120p) .
RPAR T{
Decimal value of parameter: parameter value, INV, or list
of invalid parameters
T} T{
Responses to remote set and red PAD command signal
lecture
\fINote\ 1\fR
\ \(em\ The diagnostic codes are specified in Recommendation X.25. Some
networks may not provide these characters.
.parag
\fINote\ 2\fR
\ \(em\ The standard format of the \fIincoming call PAD service\fR
signal is
given in\ \(sc\ 3.5.22.
.parag
\fINote\ 3\fR
\ \(em\ If echoing is required, the \fIline delete\fR
character is echoed
before the \fIline deleted PAD service\fR
signal is transmitted.
.parag
\fINote\ 4\fR
\ \(em\ The standard format of the indication of line delete function
completed for video terminals is a repetition of the BS\ SP\ BS sequence.
.parag
\fINote\ 5\fR
\ \(em\ The mentioned DTE address is the address of the DTE towards which
the call is being transferred by the PAD.
.parag
\fINote\ 6\fR
\ \(em\ The format of the facilities is identical to the one of the
\fIincoming call PAD service\fR
signal.
.parag
\fINote\ 7\fR
\ \(em\ The standard format of the \fIconnected PAD service\fR
signal is given in\ \(sc\ 3.5.21.
.parag
\fINote\ 8\fR
\ \(em\ Altermatively the character 2/15 (/) may be used by some
networks.
.parag
T}
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau A\(hy2/X.28 [2T12.28], p. 8\fR
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 23P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.ce 1000
ANNEX\ B
.ce 0
.ce 1000
(to Recommendation X.28)
.sp 9p
.RT
.ce 0
.ce 1000
\fBPAD Time\(hyouts\fR
.sp 1P
.RT
.ce 0
.ce
\fBH.T. [1T13.28]\fR
.ce
TABLE\ B\(hy1/X.28
.ce
\fBPAD time\(hyouts\fR
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(24p) | cw(24p) | cw(18p) | cw(30p) | cw(46p) | cw(46p) | cw(40p) .
T{
Time\(hyout value
(provisional)
T} Time\(hyout number Interface state Started by Normally terminated T{
Action to be taken when time\(hyout expires
T} Remarks
_
.T&
cw(24p) | cw(24p) | cw(18p) | lw(30p) | lw(46p) | lw(46p) | lw(40p) .
Y T10 State 1 T{
Binary 1 is transmitted on both T and R
T} T{
The PAD has received a valid \fIservice request signal\fR
T} T{
The PAD will disconnect the \fIinformation path\fR
T}
_
.T&
cw(24p) | cw(24p) | cw(18p) | lw(30p) | lw(46p) | lw(46p) | lw(40p) .
T\ =\ 60\|s T11 state 6 T{
The PAD enters the \fIPAD waiting\fR
state
T} T{
The PAD has received the first character of a \fIPAD command\fR
signal
T} T{
The PAD clears in accordance with \(sc\ 3.2.2.2
T} T{
4 possible methods may be used. This time\(hyout is not applicable in
case of leased line access.
T}
_
.T&
cw(24p) | cw(24p) | cw(18p) | lw(30p) | lw(46p) | lw(46p) | lw(40p) .
S\ >\ 60\|s T12 State 6 T{
The PAD has received the first character of a \fIPAD command\fR
signal
T} T{
The PAD has received a complete \fIPAD command\fR
signal
T} T{
The PAD will transmit an \fIerror PAD service\fR
signal (when parameter 6
is not set to\ 0) and will return to the \fIPAD waiting\fR
state of its
action is for further study (when parameter\ 6 is set to\ 0)
T} T{
The PAD will permit entry into the \fIPAD waiting\fR
state N times before
disconnecting the access information paths: this time out is not
applicable in case of leased line access.
T}
_
.T&
cw(24p) | cw(24p) | cw(18p) | lw(30p) | lw(46p) | lw(46p) | lw(40p) .
R\ >\ 60\|s T13 State 6 T{
The PAD receives a graphic character other than 2/0, 2/11 or 7/15 after
the DTE escapes from the \fIdata transfer\fR
state
T} T{
Reception of a complete \fIPAD command\fR
signal
T} T{
The PAD will transmit an \fIerror PAD service\fR
signal and will return
to the \fIdata transfer\fR
state (when parameter\ 6 is not set to\ 0) or the
\fIPAD waiting\fR
state of \fIdata transfer\fR
state as appropriate (when
parameter\ 6 is set to\ 0)
T} T{
This time\(hyout is not applicable in the case of leased line access
T}
_
.T&
cw(24p) | cw(24p) | cw(18p) | lw(30p) | lw(46p) | lw(46p) | lw(40p) .
V T20 State 4 T{
DTE transmits the \fIservice request\fR
signal
T} T{
DTE has received a \fIPAD identification service\fR
T} T{
DTE should retransmit the \fIservice request\fR
signal
T} T{
When this time\(hyout expires W times a fault should be
reported
T}
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau B\(hy1/X.28 [1T13.28], p. 9\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [2T13.28]\fR
.ce
TABLE\ B\(hy1/X.28\ \fI(cont.)\fR
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(24p) | cw(24p) | cw(18p) | cw(30p) | cw(46p) | cw(46p) | cw(40p) .
T{
Time\(hyout value
(provisional)
T} Time\(hyout number Interface state Started by Normally terminated T{
Action to be taken when time\(hyout expires
T} Remarks
_
.T&
cw(24p) | cw(24p) | cw(18p) | lw(30p) | lw(46p) | lw(46p) | cw(40p) .
B T21 State 6 T{
DTE transmits a \fIclear request PAD command\fR
signal
T} T{
The PAD has transmitted \fIclear confirmation PAD service\fR
signal
(when parameter\ 6 is not set to\ 0) or has disconnected the access
information path (when parameter\ 6 is set to\ 0)
T} T{
The DTE will disconnect the access information path (indeterminate
result)
T}
_
.T&
cw(24p) | cw(24p) | cw(18p) | lw(30p) | lw(46p) | lw(46p) | lw(40p) .
X\|=\|120\|s T30 \(em Incoming call PAD waiting state T{
The PAD will clear the virtual call
T} See \(sc\ 3.2.1.7
_
.T&
cw(24p) | cw(24p) | cw(18p) | lw(30p) | lw(46p) | lw(46p) | lw(40p) .
Z T31 \(em Circuit 108/1 or 108/2 OFF Circuit 108 ON T{
The access information path is disconnected
T} See \(sc\ 1.1.3.2
_
.T&
cw(24p) | cw(24p) | cw(18p) | lw(30p) | lw(46p) | lw(46p) | lw(40p) .
P\|>\|60 s T14 State 10 T{
The PAD is recalled from the connection in progress state
T} T{
The PAD has received the first character of a PAD command signal
T} T{
The PAD will transmit an error PAD service signal (when parameter\ 6
is not set to\ 0) and return to the connection in progress state
T}
_
.T&
cw(24p) | cw(24p) | cw(18p) | lw(30p) | lw(46p) | lw(46p) | lw(40p) .
Q\|>\|60 s T15 State 6 T{
The PAD receives a graphic character other than 2/0, 2/11 or 7/15
after the DTE escape from the connection in progress state
T} T{
Reception of a complete PAD command signal
T} (As for P above)
_
.TE
.nr PS 9
.RT
.ad r
\fBTableau B\(hy1/X.28 [2T13.28], p. 10\fR
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 5P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.ce 1000
ANNEX\ C
.ce 0
.ce 1000
(to Recommendation X.28)
.sp 9p
.RT
.ce 0
.ce 1000
\fBPAD service signals for extended dialogue mode\fR
.sp 1P
.RT
.ce 0
.PP
C.1
Possible PAD service signals text in Spanish for extended
dialogue mode
.sp 1P
.RT
.sp 1P
.LP
1.
ENGAGED
\(em
Comunicaci\*'on establecida (\(sc 3.5.11/X.28).
.sp 9p
.RT
.LP
2.
FREE
\(em
Comunicaci\*'on no establecida (\(sc 3.5.11/X.28).
.LP
3.
\fIReset PAD service\fR signal (Table 5/X.28).
.LP
DTE
\(em
reiniciaci\*'on por el dispositivo en el extremo distante,
pueden perderse datos
.LP
ERR
\(em
reiniciaci\*'on por la red, error de procedimiento local,
pueden perderse datos
.LP
NC
\(em
reiniciaci\*'on debido por problema en la red, pueden perderse datos
.LP
RPE
\(em
reiniciaci\*'on por la red, error de procedimiento en el
extremo distante, pueden perderse datos
.sp 1P
.LP
4.
\fIClear PAD service\fR signal (Table 6/X.28)\fR
.sp 9p
.RT
.LP
OCC
\(em
liberaci\*'on de la llamada, n\*'umero ocupado
.LP
NC
\(em
liberaci\*'on de la llamada, problema temporal en la
red
.LP
INV
\(em
liberaci\*'on de la llamada, petici\*'on de facilidad no v\*'alida
.LP
NA
\(em
liberaci\*'on de la llamada, acceso prohibido a este
n\*'umero
.LP
ERR
\(em
liberaci\*'on de la llamada, error de procedimiento
local, identificado por la red
.LP
RPE
\(em
liberaci\*'on de la llamada, error de procedimiento en el extremo distante,
identificado por la red
.LP
NP
\(em
liberaci\*'on de la llamada, n\*'umero no asignado
.LP
DER
\(em
liberaci\*'on de la llamada, n\*'umero fuera de
servicio
.LP
PAD
\(em
liberaci\*'on de la llamada, petici\*'on distante
.LP
DTE
\(em
liberaci\*'on de la llamada, por el dispositivo en el extremo distante,
pueden perderse datos
.LP
RNA
\(em
liberaci\*'on de la llamada, cobro revertido
rechazado
.LP
ID
\(em
liberaci\*'on de la llamada, destino incompatibile
.LP
SA
\(em
liberaci\*'on de la llamada, barco ausente
.LP
FNA
\(em
liberaci\*'on de llamada, selecci\*'on r\*'apida
rechazada
.LP
ROO
\(em
liberaci\*'on de llamada, no se puede encaminar seg\*'un se ha pedido
.sp 1P
.LP
5.
\fIclear confirmation PAD service\fR signal (Table 7/X.28)
.sp 9p
.RT
.LP
CONF
\(em
liberaci\*'on de llamada, confirmaci\*'on
.LP
.rs
.sp 8P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.sp 1P
.LP
6.
PAD parameter names (Table 8/X.28)
.sp 9p
.RT
.LP
.sp 5
.ce
\fBH.T. [T14.28]\fR
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(36p) | cw(156p) .
Parameter reference number Parameter description
_
.T&
cw(36p) | lw(156p) .
\ 1 T{
\(em\ rellamada al EDD utilizando un car\*'acter
T}
.T&
cw(36p) | lw(156p) .
\ 2 \(em\ eco
.T&
cw(36p) | lw(156p) .
\ 3 T{
\(em\ elecci\*'on de la se\o"n~"al de envi\*'o de datos
T}
.T&
cw(36p) | lw(156p) .
\ 4 T{
\(em\ elecci\*'on de la duraci\*'on de la temporizaci\*'on de reposo
T}
.T&
cw(36p) | lw(156p) .
\ 5 T{
\(em\ control de dispositivo auxiliar
T}
.T&
cw(36p) | lw(156p) .
\ 6 T{
\(em\ control de se\o"n~"ales de servicio de EDD
T}
.T&
cw(36p) | lw(156p) .
\ 7 T{
\(em\ operaci\*'on al recibir una se\o"n~"al de corte
T}
.T&
cw(36p) | lw(156p) .
\ 8 \(em\ descartar salida
.T&
cw(36p) | lw(156p) .
\ 9 T{
\(em\ relleno despu\*'es del retroceso del carro
T}
.T&
cw(36p) | lw(156p) .
10 T{
\(em\ delimitaci\*'on de la l\*'inea
T}
.T&
cw(36p) | lw(156p) .
11 T{
\(em\ velocidad binaria del ETD arr\*'itmico
T}
.T&
cw(36p) | lw(156p) .
12 T{
\(em\ control de flujo del EDD
T}
.T&
cw(36p) | lw(156p) .
13 T{
\(em\ inserci\*'on de cambio de rengl\*'on despu\*'es del retroceso del carro
T}
.T&
cw(36p) | lw(156p) .
14 T{
\(em\ relleno despu\*'es del cambio de rengl\*'on
T}
.T&
cw(36p) | lw(156p) .
15 \(em\ edici\*'on
.T&
cw(36p) | lw(156p) .
16 T{
\(em\ supresi\*'on de car\*'acter
T}
.T&
cw(36p) | lw(156p) .
17 T{
\(em\ supresi\*'on de l\*'inea
T}
.T&
cw(36p) | lw(156p) .
18 T{
\(em\ visualizaci\*'on de l\*'inea
T}
.T&
cw(36p) | lw(156p) .
19 T{
\(em\ se\o"n~"ales de servicio de EDD de edici\*'on
T}
.T&
cw(36p) | lw(156p) .
20 \(em\ m\*'ascara de eco
.T&
cw(36p) | lw(156p) .
21 T{
\(em\ tratamiento de la paridad
T}
.T&
cw(36p) | lw(156p) .
22 \(em\ espera de p\*'agina
_
.TE
.nr PS 9
.RT
.ad r
\fBTABLE C\(hy8/X.28 [T14.28], p.\fR
.sp 1P
.RT
.ad b
.RT
.LP
.sp 5
.PP
C.2
Possible \fIPAD service\fR signals text in French for extended
dialogue mode
.sp 1P
.RT
.sp 1P
.LP
1.
ENGAGED
\(em
\*'etat occup\*'e (\(sc 3.5.11/X.28).
.sp 9p
.RT
.LP
2.
FREE
\(em
\*'etat libre (\(sc 3.5.11/X.28).
.LP
3.
\fIReset PAD service\fR signal (Table 5/X.28).
.LP
DTE
\(em
r\*'einitialisation par l'\*'equipement distant, perte de donn\*'ees
possibles
.LP
ERR
\(em
r\*'einitialisation par le r\*'eseau, erreur de proc\*'edure locale,
perte de donn\*'ees possibles
.LP
NC
\(em
r\*'einitialisation en raison d'un d\*'erangement momentan\*'e du
r\*'eseau, perte de donn\*'ees possibles
.LP
RPE
\(em
r\*'einitialisation par le r\*'eseau, erreur de proc\*'edure distante,
perte de donn\*'ees possibles
.bp
.sp 1P
.LP
4.
\fIClear PAD service\fR signal (Table 6/X.28)\fR
.sp 9p
.RT
.LP
OCC
\(em
communication lib\*'er\*'ee, num\*'ero occup\*'e
.LP
NC
\(em
communication lib\*'er\*'ee, encombrement momentan\*'e du
r\*'eseau
.LP
INV
\(em
communication lib\*'er\*'ee, demande de service
compl\*'ementaire non valable
.LP
NA
\(em
communication lib\*'er\*'ee, interdiction d'acc\*`es au
num\*'ero
.LP
ERR
\(em
communication lib\*'er\*'ee, erreur de proc\*'edure locale
d\*'ecel\*'ee par le r\*'eseau
.LP
RPE
\(em
communication lib\*'er\*'ee, erreur de proc\*'edure distante d\*'ecel\*'ee
par le r\*'eseau
.LP
NP
\(em
communication lib\*'er\*'ee, num\*'ero non attribu\*'e
.LP
DER
\(em
communication lib\*'er\*'ee, num\*'ero en d\*'erangement
.LP
PAD
\(em
communication lib\*'er\*'ee, demande distante
.LP
DTE
\(em
communication lib\*'er\*'ee, par un \*'equipement distant
.LP
RNA
\(em
communication lib\*'er\*'ee, taxation \*`a l'arriv\*'ee
refus\*'ee
.LP
ID
\(em
communication lib\*'er\*'ee, destination incompatible
.LP
SA
\(em
communication lib\*'er\*'ee, le navire ne peut \*\|etre
atteint
.LP
FNA
\(em
communication lib\*'er\*'ee, s\*'election rapide refus\*'ee
.LP
ROO
\(em
communication lib\*'er\*'ee, acheminement demand\*'e
impossible
.sp 1P
.LP
5.
\fIClear confirmation PAD service\fR \| signal
(Table 7/X.28)
.sp 9p
.RT
.LP
CONF
\(em
communication lib\*'er\*'ee confirmation
.sp 1P
.LP
6.
PAD parameter names (Table 8/X.28)
.sp 9p
.RT
.LP
.sp 1
.rs
.sp 25P
.ad r
\fBCuadro [T15.28], p. \fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp