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Recommendation X.10
CATEGORIES OF ACCESS FOR DATA TERMINAL EQUIPMENT (DTE)
TO PUBLIC DATA TRANSMISSION SERVICES
(Malaga-Torremolinos, 1984; amended at Melbourne, 1988)
The CCITT,
considering
(a) that Recommendation X.1 defines the international user classes of
service in public data networks (PDNs) and ISDN;
(b) that Recommendation X.2 defines the international user services and
facilities in PDNs;
(c) that Recommendation X.3 defines the Packet Assembly/Disassembly
facility (PAD) in packet switched public data networks;
(d) that Recommendation I.411 defines the reference configurations for
access to ISDN services, including Terminal Adaptor (TA) functional grouping;
(e) that Recommendations X.30 (I.461), X.31 (I.462) and the I.230 series,
define the circuit switched and packet switched data transmission services
available from ISDN (including through Terminal Adaptors);
(f) the desirability for the users to have defined the various
possibilities and requirements for accessing the different public data
transmission services,
unanimously recommends
that categories of access for data terminal equipment (DTE) to the data
transmission services provided by PDNs and by ISDNs through Terminal Adaptors
should be as defined in this Recommendation.
1 Scope
This Recommendation defines the different categories of access for data
terminal equipment to the different data transmission services provided by public
data networks (PDNs) as defined in Recommendation X.2 and by ISDNs (including
through Terminal Adaptors) as defined in Recommendations X.30 (I.461) X.31
(I.462) and the I.230 series, namely:
i) circuit switched data transmission services;
ii) packet switched data transmission services;
iii) leased circuit data transmission services.
The categories of access described in this Recommendation take into
account direct connections (see Note) to public data networks and ISDNs and the
various access cases where interworking with other public networks is involved.
Access to the packet switched data transmission service via the PAD function as
defined in Recommen-dation X.3 is also covered in this Recommendation.
Note - Direct connections may be provided by means of leased circuits or
by dedicated access circuits.
2 General
Access for data terminal equipment to data transmission services may be
achieved by either of the following (see Note):
a) by direct connection of the DTE to the public data network or ISDNs;
b) or by switched connection of the DTE to a PDN via an intermediate
public network of another type (including a PDN, PSTN or ISDN);
c) or by switched connection of the DTE to an ISDN (including through a
Terminal Adaptor) via an intermediate public network of another type.
For example, packet mode terminals may access the public packet switched
data transmission service, in user classes of service 8 to 11, either directly or
via a switched connection. The switched connection will be established using a
circuit switched data network or a public switched telephone network. In both
switched cases an interworking function will be required to access the packet
switched data transmission service.
Note - It is not mandatory for Administrations to provide all the
categories of access contained in this Recommendation.
3 Categories of access
S 3.1 specifies the categories of access to the data transmission services
provided by PDNs for the direct connection case.
S 3.2 specifies the categories of access to the data transmission services
provided by PDNs for the switched connection case.
S 3.3 specifies the categories of access to the data transmission services
provided by ISDNs through Terminal Adaptors for the direct connection case.
S 3.4 specifies the categories of access to the data transmission services
provided by ISDNs through Terminal Adaptors for the switched connection case.
Fascicle VIII.2 - Rec. X.10 PAGE1
3.1 Direct connection to data transmission services provided by public data
networks
TABLE 1/X.10
Start-stop direct connection to a circuit switched data transmission service (see Notes 1
and 2)
Category of Data signalling DTE/DCE interface
access rate requirements
A1 50 to 200 bit/s See Recommendations X.20 and
A2 300 bit/s X.20 bis
TABLE 2/X.10
Synchronous direct connection to a circuit switched
data transmission service
(see Note 1)
Category of Data signalling DTE/DCE interface
access rate requirements
B1 600 bit/s
B2 2 400 bit/s
B3 4 800 bit/s See Recommendations X.21 and
X.21 bis
B4 9 600 bit/s
B5 48 000 bit/s
B6 64 000 bit/s
PAGE8 Fascicle VIII.2 - Rec. X.10
TABLE 3/X.10
Start-stop direct connection to a packet switched
data transmission service
(see Notes 1 and 2)
Category of Data signalling DTE/DCE interface
access rate requirements
C1 110 bit/s
C2 200 bit/s
C3 300 bit/s See Recommendation X.28
C4 200 bit/s
C5 75/1 200 bit/s
C6 2 400 bit/s
TABLE 4/X.10
Synchronous direct connection to a packet switched
data transmission service
(see Note 1)
Category of access Data signalling rate DTE/DCE interface
requirements
D1 2 400 bit/s
D2 4 800 bit/s See Recommendations X.25
and X.31
D3
Fascicle VIII.2 - Rec. X.10 PAGE1
9 600 bit/s (case A)
D4 48 000 bit/s (see Note 3)
D5 64 000 bit/s
TABLE 5/X.10
Start-stop direct connection to a leased circuit
data transmission service
(see Note 2)
Category of Data signalling DTE/DCE interface
access rate requirements
E1 50 to 200 bit/s See Recommendations X.20 and
E2 300 bit/s X.20 bis
PAGE8 Fascicle VIII.2 - Rec. X.10
TABLE 6/X.10
Synchronous direct connection to a leased circuit
data transmission service
Category of Data signalling DTE/DCE interface
access rate requirements
F1 600 bit/s
F2 2 400 bit/s
F3 4 800 bit/s See Recommendations X.21 and
X.21 bis
F4 9 600 bit/s
F5 48 000 bit/s
3.2 Switched connection to data transmission services provided by public data
networks
TABLE 7/X.10
Synchronous switched connection by means of the PSTN
to a circuit switched data transmission service
For further study.
TABLE 8/X.10
Start-stop switched connection by means of a CSPDN
to a packet switched data transmission service
Category of Data signalling DTE/DCE interface
access rate requirements
K1 300 bit/s See Recommendation X.28
TABLE 9/X.10
Start-stop switched connection by means of the PSTN
to a packet switched data transmission service
Category of Data signalling DTE/DCE interface
access rate
Fascicle VIII.2 - Rec. X.10 PAGE1
requirements
L1 110 bit/s
L2 200 bit/s
L3 300 bit/s See Recommendation X.28
L4 200 bit/s
L5 75/1 200 bit/s
L6 2 400 bit/s
TABLE 10/X.10
Synchronous switched connection by means of a CSPDN
to a packet switched data transmission service
Category of access Data signalling rate DTE/DCE interface
requirements
O1 2 400 bit/s
O2 4 800 bit/s
O3 9 600 bit/s See Recommendation X.32
O4
PAGE8 Fascicle VIII.2 - Rec. X.10
48 000 bit/s
O5 64 000 bit/s
Fascicle VIII.2 - Rec. X.10 PAGE1
TABLE 11/X.10
Synchronous switched connection by means of the PSTN
to a packet switched data transmission service
Category of access Data signalling rate DTE/DCE interface
requirements
P1 1 200 bit/s
P2 2 400 bit/s
P3 4 800 bit/s See Recommendation X.32
P4 9 600 bit/s
TABLE 12/X.10
Synchronous switched access by means of an ISDN B channel
to a packet switched data transmission service
Category of access Data signalling DTE/DCE interface requirements at
rate
Reference point S/T Reference point R
Q1 2 400 bit/s
Q2 4 800 bit/s See Recommendation
X.31
Q3
PAGE8 Fascicle VIII.2 - Rec. X.10
9 600 bit/s (case A) See Recommendation
X.32
Q4 48 000 bit/s and Recommendation
X.32
Q5 64 000 bit/s
3.3 Direct connection to data transmission services provided by ISDNs
(including through Terminal Adaptors)
Fascicle VIII.2 - Rec. X.10 PAGE1
TABLE 13/X.10
Synchronous direct connection to a circuit switched
data transmission service
Category of access Data signalling DTE/DCE interface requirements at
rate
Reference point S/T Reference point R
S1 600 bit/s
S2 2 400 bit/s
S3 4 800 bit/s See Recommendation See Recommendations
X.30 X.21 and X.21 bis
S4 9 600 bit/s
S5 48 000 bit/s
S6 64 000 bit/s
TABLE 14/X.10
PAGE8 Fascicle VIII.2 - Rec. X.10
Synchronous direct connection via the ISDN B channel
to a packet switched data transmission service
Category of access Data signalling DTE/DCE interface requirements at
rate
Reference point S/T Reference point R
T1 2 400 bit/s
T2 4 800 bit/s See Recommendation See Recommendation
X.31 (case B) X.25
T3 9 600 bit/s
T4 48 000 bit/s
T5 64 000 bit/s
TABLE 15/X.10
Synchronous direct connection via the ISDN D channel
to a packet switched data transmission service
Category of access Data signalling DTE/DCE interface requirements at
rate
Fascicle VIII.2 - Rec. X.10 PAGE1
Reference point S/T Reference point R
U1 2 400 bit/s
U2 4 800 bit/s
U3 9 600 bit/s
U4 . 48 000 bit/s (see See Recommendation See Recommendation
Note 4) X.31 X.25
U5 64 000 bit/s (see
Note 4)
PAGE8 Fascicle VIII.2 - Rec. X.10
3.4 Switched connection to data transmission services provided by ISDNs
(including through Terminal Adaptors)
TABLE 16/X.10
Start-stop switched connection by means of the PSTN
to a packet switched data transmission service
For further study.
TABLE 17/X.10
Synchronous switched connection by means of a CSPDN
to a packet switched data transmission service
For further study.
TABLE 18/X.10
Synchronous switched connection by means of the PSTN to a packet switched data
transmission service
For further study.
TABLE 19/X.10
Synchronous switched connection by means of an ISDN B channel
to a packet switched data transmission service
Category of access Data signalling DTE/DCE interface requirements at
rate
Reference point S/T Reference point R
Y1 2 400 bit/s
Y2 4 800 bit/s
Y3 9 600 bit/s See Recommendation See Recommendation
X.31 (case B) X.25
Y4 48 000 bit/s
Y5 64 000 bit/s
Fascicle VIII.2 - Rec. X.10 PAGE1
Note 1 - Direct connections may be provided by means of leased circuits or by dedicated
access circuits.
Note 2 - Some Administrations may offer the categories of access of 600 bit/s, 1200
bit/s, 2400 bit/s, 4800 bit/s and 9600 bit/s.
Note 3 - Recommendation X.31 (case A) is appropriate at the S/T reference point when
category of access D5 is provided by means of ISDN B channel.
Note 4 - For 64 kbit/s D channel only.
PAGE8 Fascicle VIII.2 - Rec. X.10
