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ABBREVIATIONS SPECIFIC TO SIGNALLING SYSTEM No. 71)
English French Spanish Meaning
ACB ACI SAP Access barred signal
Table 3/Q.723
ACC RAE CAC Automatic congestion control information
message
Table 3/Q.723
ACM ACO MDC Address complete message
Table 3/Q.723, Figure 3/Q.724
ADI ADI SDI
1) This list of abbreviations is basically the one appearing in Fascicle VI.6 of the
Yellow Book, 1980. Study Group XI should bring this list up to date in the Study Period
1989-1992.
Fascicle VI.9 - Abbreviations PAGE1
Address incomplete signal
Table 3/Q.723, Figure 3/Q.724
AERM STEA MA Alignment error rate monitor
Figures 7-9/Q.703 and 11-17/Q.703
ANC RAT RCT Answer signal, charge
Table 3/Q.723, Figure 3/Q.724
ANN RST RST Answer signal, no charge
Table 3/Q.723
ANU RSI RNC Answer signal, unqualified
PAGE38 Fascicle VI.7 - Abbreviations
Table 3/Q.723
BIB BIR BII Backward indicator bit
Figures 3/Q.703, 13/Q.703 and 15/Q.703
BLA BLA ARB Blocking-acknowledgement signal
Table 3/Q.723
BLO BLO BLO Blocking signal
Table 3/Q.723
BSM DE MPE Backward set-up message
Fascicle VI.9 - Abbreviations PAGE1
Table 3/Q.723
BSN NSR NSI Backward sequence number
Figures 3/Q.703, 14/Q.703 and 16/Q.703
BSNR NSR-R NSIR Backward sequence number received
Figures 7/Q.703, 13/Q.703, 14/Q.703, 16/Q.703
BSNT NSR-E NSIT Backward sequence number of next SU to be
transmitted
Figures 7-9/Q.703 and 13-16/Q.703, Figures 27
and 30/Q.704.
CBA RCA ARS Changeback acknowledgement signal
PAGE38 Fascicle VI.7 - Abbreviations
Table 3/Q.704
CBD RCO ORS Changeback declaration signal
Table 3/Q.704
CBK RAC COL Clear-back signal
Table 3/Q.723, Figure 3/Q.724
Fascicle VI.9 - Abbreviations PAGE1
English French Spanish Meaning
CCF CCN FCO Continuity-failure signal
Table 3/Q.723
CCI CCE PCL Continuity check incoming
Recommendation Q.724, S 7.3, Figures 3/Q.724,
5/Q.724
CCL RAD LALN Calling party clear signal
Table 3/Q.723
CCM SC MSC Circuit supervision message
PAGE38 Fascicle VI.7 - Abbreviations
Table 3/Q.723
CCO CCS PCS Continuity-check outgoing
Recommendation Q.723, S 7.3, Figures 3/Q.724,
4/Q.724
CCR CCD PPC Continuity-check-request signal
Table 3/Q.723, Figures 2/Q.724, 3/Q.724,
6/Q.724 and 7/Q.724
CCS CS SCC Common channel signalling
Recommendation Q.701, S 1.1
CFL ECH SLI Call-failure signal
Fascicle VI.9 - Abbreviations PAGE1
Table 3/Q.723, Figure 3/Q.724
CGC EFC CHC Circuit-group-congestion
Table 3/Q.723, Figure 3/Q.724
CHG TAX MTA Charging message
Table 3/Q.723
CHM PR MPA Changeover and changeback messages
Table 1/Q.704
CIC CIC CIC Circuit identification code
PAGE38 Fascicle VI.7 - Abbreviations
Recommendation Q.704, S 15, Recommendation
Q.723, S 2.2.1
CIR IDD PIL Calling-line-identity-request signal
Table 3/Q.723
CK CRT BCE Check bits
Figure 3/Q.703
CLF FIN FIN Clear-forward signal
Table 3/Q.723, Figures 3/Q.724, 6/Q.724,
7/Q.724
CNM GRC GRC Circuit network management message group
CNP CLI CIM
Fascicle VI.9 - Abbreviations PAGE1
Connection-not-possible signal
Table 1/Q.704
CNS CLN CIN Connection-not-successful signal
Table 1/Q.704
COA PCA APR Changeover acknowledgement signal
Table 1/Q.704
COO PCO OPR Changeover order signal
Table 1/Q.704
COT CCP CON Continuity signal
PAGE38 Fascicle VI.7 - Abbreviations
Table 3/Q.723, Figure 3/Q.724
Fascicle VI.9 - Abbreviations PAGE1
English French Spanish Meaning
CPC STA CTL Call processing control
Recommendation Q.724, S 10.2, Figures
1-7/Q.724
CRI CRE RPL Continuity recheck incoming
Recommendation Q.724, S 15.1, Figures
1/Q.724, 2/Q.724, 3/Q.724, 6/Q.724, 7/Q.724
CRO CRS RPS Continuity-recheck outgoing
Recommendation Q.724, S 15.1, Figures
1-3/Q.724, 6/Q.724
CSM SA MSL Call supervision message
PAGE38 Fascicle VI.7 - Abbreviations
Table 3/Q.723
CSS CLR SCF Connection-successful signal
Table 1/Q.704
DAEDR DAD-R DADR Delimitation, alignment, error detection
(reception)
Figures 7/Q.703, 9/Q.703, 11/Q.703, 14/Q.703,
16/Q.703, 17/Q.703, 18/Q.703
DAEDT DAD-E DADT Delimitation, alignment, error detection
(transmitting)
Figures 12/Q.703, 13/Q.703, 15/Q.703
DCE ETCD ETCD Data circuit terminating equipment
Fascicle VI.9 - Abbreviations PAGE1
Figure 1/Q.702
DLC CLO CED Signalling-data-link-connection-order signal
Table 1/Q.704
DLM CL MED Signalling-data-link-connection-order message
Table 1/Q.704
DPC CPD CPD Destination point code
Recommendation Q.704, SS 2.2.3, 13.2, Figure
3/Q.704, 14/Q.704, 26/Q.704, Recommendation
Q.706, S 3, Recommendation Q.723, S 2.2.1
DPN CNN TDN Digital path not provided signal
PAGE38 Fascicle VI.7 - Abbreviations
Table 3/Q.723
DUP SSUD PUD Data user part
Recommendation Q.701, S 2.1, Figure 2/Q.701
ECA PUA AER Emergency changeover acknowledgement signal
Table 1/Q.704
ECM PU MEP Emergency changeover message
Table 1/Q.704
ECO PUO PER Emergency changeover order signal
Fascicle VI.9 - Abbreviations PAGE1
Table 1/Q.704
EUM EXT IAL Extended-unsuccessful-backward set-up
information message indication
Table 3/Q.723
F F BAN Flag
Figure 3/Q.703
PAGE38 Fascicle VI.7 - Abbreviations
English French Spanish Meaning
FAM AD MDA Forward-address message
Table 3/Q.723
FCM CF MCF Signalling traffic flow control messages
Table 1/Q.704
FDM MRF MDF Frequency division multiplex
Recommendation Q.723, S 2.2.3, Recommendation
Q.724, S 9
FIB BIA BID Forward indicator bit
Fascicle VI.9 - Abbreviations PAGE1
Figures 3/Q.703, 13/Q.703, 15/Q.703
FISU TSR USR Fill-in signal unit
Figures 7/Q.703, 8/Q.703, 13-16/Q.703
FOT IOP INT Forward-transfer signal
Table 3/Q.723
FSM EA MEL Forward set-up message
Table 3/Q.723
FSN NSA NSD Forward sequence number
PAGE38 Fascicle VI.7 - Abbreviations
Figures 3/Q.703, 13/Q.703
GRA RZA ARG Circuit group reset-acknowledgement message
Table 3/Q.723
GRM SGC MSG Circuit group supervision message
Table 3/Q.723
GRQ DEG MPG General request message
GRS RZG MRG Circuit group reset message
Table 3/Q.723
GSM ING
Fascicle VI.9 - Abbreviations PAGE1
MEG General forward setup information message
HBA BHA ABGSF Hardware failure oriented group
blocking-acknowledgement message
Table 3/Q.723
HGB BLH BGSF Hardware failure oriented group blocking
message
Table 3/Q.723
HGU DBH DGSF Hardware failure oriented group unblocking
message
Table 3/Q.723
HUA DHA ADGSF Hardware failure oriented group unblocking
acknowledgement message
PAGE38 Fascicle VI.7 - Abbreviations
Table 3/Q.723
HMDC ODC HDCM Message discrimination
Recommendation Q.704, S 2, Figures
23-26/Q.704
HMDT ODT HDTM Message distribution
Recommendation Q.704, S 2, Figures
23-25/Q.704, 28/Q.704, 30/Q.704, 31/Q.704,
42/Q.704, 44-46/Q.704, 2/Q.707
HMRT OAC HENM Message routing
Recommendation Q.704, S 2, Figures 23/Q.704,
24/Q.704, 26/Q.704, 27/Q.704, 30/Q.704,
31/Q.704, 32/Q.704, 33/Q.704, 42/Q.704,
44/Q.704, 45/Q.704, 46/Q.704, 2/Q.707
Fascicle VI.9 - Abbreviations PAGE1
English French Spanish Meaning
HO HO EO Heading code
Recommendation Q.704, S 15.3, Figure
16/Q.704, Recommendation Q.707, S 5.3, Figure
1/Q.707, Recommendation Q.723, SS 3.1 and 3.2
H1 H1 E1 Heading code
Recommendation Q.704, S 15.3, Figure
16/Q.704, Recommendation Q.723, S 3.1
IAC CAI CAI Initial alignment control
Figures 8/Q.703, 9/Q.703, 13-17/Q.703
IAI MIS MIA Initial address message with additional
PAGE38 Fascicle VI.7 - Abbreviations
information
Table 3/Q.723
IAM MIA MID Initial address message
Table 3/Q.723, Figures 3/Q.724, 6/Q.724
ISDN-UP SSUR PU-RDSI ISDN User Part
(ISUP) Recommendations Q.700 and Q.761 to Q.764
ISP PSI PSI International signalling point
Recommendation Q.705, S 3, Figure 1/Q.705
L1 N1 N1 Level 1
Fascicle VI.9 - Abbreviations PAGE1
Figures 12/Q.703, 35/Q.704, 38-40/Q.704
L2 N2 N2 Level 2
Figures 8/Q.703, 9/Q.703, 12/Q.703, 13/Q.703,
15/Q.703, 23/Q.704, 24/Q.704, 26/Q.704,
27/Q.704, 30/Q.704, 35/Q.704, 37/Q.704
L3 N3 N3 Level 3
Figures 8/Q.703, 9/Q.704, 13/Q.703, 15/Q.703,
23/Q.704, 24/Q.704, 26/Q.704, 30/Q.704,
31/Q.704, 34/Q.704, 35/Q.704, 37/Q.704,
38/Q.704, 39/Q.704
L4 N4 N4 Level 4
Figures 23/Q.704, 25-27/Q.704, 34/Q.704
LI INL IL Length indicator
PAGE38 Fascicle VI.7 - Abbreviations
Recommendation Q.703, S 2.2, Figure 3/Q.703
LLSC GCSF CCE Link set control
Figures 29/Q.704, 35-37/Q.704
LOS LHS LFS Line-out-of-service signal
Table 3/Q.723, Figure 3/Q.724
LSAC GCSA CAE Signalling link activity control
Recommendation Q.704, S 12.6, Figures
28-30/Q.704, 35-41/Q.704
LSC SET CEE Link state control
Fascicle VI.9 - Abbreviations PAGE1
Figures 7-10/Q.703, 13-18/Q.703,
Recommendation Q.704, S 14.6, Figure 41/Q.704
LSDA GCAL AED Signalling data link allocation
Recommendation Q.704, S 12.6, Figures
35/Q.704, 37-40/Q.704, 42/Q.704
PAGE38 Fascicle VI.7 - Abbreviations
English French Spanish Meaning
LSLA GCAC AES Signalling link activation
Recommendation Q.704, S 12.6, Figures
35/Q.704, 37/Q.704, 38/Q.704, 41/Q.704,
42/Q.704
LSLD GCDA DES Signalling link deactivation
Recommendation Q.704, S 12.6, Figures
35/Q.704, 37/Q.704, 40/Q.704, 41/Q.704,
42/Q.704
LSLR GCRE RES Signalling link restoration
Recommendation Q.704, S 12.6, Figures
35/Q.704, 37/Q.704, 39/Q.704, 41/Q.704,
42/Q.704
LSSU TSE UEE Link status signal units
Fascicle VI.9 - Abbreviations PAGE1
Figures 13-16/Q.703
LSTA GCAT ATS Signalling terminal allocation
Recommendation Q.704, S 12.6, Figures
35/Q.704, 38/Q.704, 39/Q.704, 40/Q.704,
41/Q.704
MBA BMA ABGM Maintenance oriented
group-blocking-acknowledgement
Table 3/Q.723
MGB BLM BGM Maintenance oriented group blocking message
Table 3/Q.723
MGMT GES SGE Management system
PAGE38 Fascicle VI.7 - Abbreviations
Figures 8/Q.703, 27/Q.704, 28/Q.704,
35-37/Q.704, 2/Q.707
MGU DBM DGM Maintenance oriented group unblocking message
Table 3/Q.723
MPR INU PIMM Misdialled trunk prefix
Table 3/Q.723
MSU TSM USM Message signal unit
Recommendation Q.701, S 2.3, Figures 7/Q.703,
8/Q.703, 14/Q.703, 15/Q.703, 16/Q.703
MTP SSTM PTM Message transfer part
Fascicle VI.9 - Abbreviations PAGE1
Recommendation Q.701, S 2.1, Recommendation
Q.721, S 1
MUA DMA ADGM Maintenance oriented group
unblocking-acknowledgement message
Table 3/Q.723
NACK ACN RN Negative acknowledgement
Figures 7/Q.703, 13/Q.703, 14/Q.703
NNC ERN CRN National-network-congestion signal
Table 3/Q.723, Figure 3/Q.724
NSP PSN PSN National signalling point
PAGE38 Fascicle VI.7 - Abbreviations
Recommendation Q.705, S 3, Figure 1/Q.705
OMAP SSEM POMA Operation, Administration and Maintenance
Part
Recommendations Q.700 and Q.795
OPC CPO CPO Originating point code
Recommendation Q.704, SS 2.2.3 and 13.2,
Figures 3/Q.704 and 14/Q.704, Recommendation
Q.706, S 3, Recommendation Q.723, S 2.2.1
Fascicle VI.9 - Abbreviations PAGE1
English French Spanish Meaning
PCM MIC MIC Pulse code modulation
Recommendation Q.702, S 5.3
PCR RCP RCP Preventive cyclic retransmission
Tables 1/Q.706, 2/Q.706
POC SIP CIP Processor outage control
Figures 8/Q.703, 10/Q.703
RAN NRP RRE Reanswer signal
PAGE38 Fascicle VI.7 - Abbreviations
Table 3/Q.723, Figure 3/Q.724
RC REC CR Reception control
Figures 8/Q.703, 9/Q.703, 11/Q.703,
13-16/Q.703
RLG LIG LGU Release-guard signal
Table 3/Q.723, Figures 2/Q.724, 3/Q.724,
6/Q.724, 7/Q.724
RSC RZC RCI Reseat-circuit signal
Table 3/Q.723
RSM TR MPR Signalling-route-set-test message
Fascicle VI.9 - Abbreviations PAGE1
Table 1/Q.704
RSRT GRTF CPC Signalling route set test control
Recommendation Q.704, S 13.5, Figures
23/Q.704, 29/Q.704, 43-46/Q.704
RST TRS PRS Signalling-route-set-test signal
Table 1/Q.704
RTAC GRTA CTA Transfer allowed control
Recommendation Q.704, S 13.3, Figures
29/Q.704, 33/Q.704, 37/Q.704, 43/Q.704,
45/Q.704, 46/Q.704
RTB TRT MTR Retransmission buffer
PAGE38 Fascicle VI.7 - Abbreviations
Figures 7/Q.703, 13/Q.703, 15/Q.703
RTPC GRTI CTP Transfer prohibited control
Recommendation Q.704, S 13.2, Figures
26/Q.704, 29/Q.704, 32/Q.704, 43/Q.704,
44/Q.704, 46/Q.704
SAM MSA MSD Subsequent-address message
Table 3/Q.723, Figure 3/Q.724
SAO MSS SDU Subsequent-address message with one signal
Table 3/Q.723
SBA BSA ABGSL Software generated group
blocking-acknowledgement message
Fascicle VI.9 - Abbreviations PAGE1
Table 3/Q.723
SBM SE MEC Successful-backward-set-up information
message
Table 3/Q.723
SCCP SSCS PCCS Signalling Connection Control Part
Recommendations Q.700, Q.711-Q.714 and Q.716
SDL LDS LED Functional specification and description
language
Recommendations Q.703, S 12, Q.704, S 6,
Q.707, Recommendations Q.714, Q.724, Q.764,
Q.774
PAGE38 Fascicle VI.7 - Abbreviations
English French Spanish Meaning
SEC EEC CEC Switching-equipment-congestion signal
Table 3/Q.723, Figure 3/Q.724
SF ETC CE Status field
Figure 3/Q.703
SGB BLS BGSL Software generated group blocking message
Recommendation Q.723, Table 3/Q.723
SGU DBS DGSL Software generated group unblocking message
Fascicle VI.9 - Abbreviations PAGE1
Recommendation Q.723, Table 3/Q.723
SI INS IS Service indicator
Recommendation Q.704, S 14
SIE ETAU IAE Status indication "emergency terminal status"
Recommendation Q.703, SS 7.2, 7.3 and 10.1.3,
Figures 2/Q.703, 4/Q.703, 7-9/Q.703,
13-16/Q.703
SIF INF CIS Signal information field
Figure 3/Q.703
SIN ETAN IAN Status indication "normal terminal status"
PAGE38 Fascicle VI.7 - Abbreviations
Recommendation Q.703, SS 7.2, 7.3 and 10.1.3,
Figures 2/Q.703, 4/Q.703, 7-9/Q.703,
13-16/Q.703
SIO SER OIS Service information octet
Figure 3/Q.703, Recommendation Q.723, S 1.2
SIO2) ETAP IFA Status indication "out of alignment"
Recommendation Q.703, SS 7.2, 7.3 and 10.1.3,
Figures 2/Q.703, 4/Q.703, 7-9/Q.703,
13-16/Q.703
SIOS ETHS IFS Status indication "out of service"
Recommendation Q.703, SS 7.2, 7.3 and 10.1.3,
Figures 2/Q.703, 4/Q.703, 7-9/Q.703,
13-16/Q.703
SIPO ETIP IIP Status indication "processor outage"
2) In English, another abbreviation will have to be found for status indication "out
of alignment", since the abbreviation SIO is already used for service information
octet.
Fascicle VI.9 - Abbreviations PAGE1
Recommendation Q.703, S 10.1.3, Figures
2/Q.703, 7/Q.703, 8/Q.703, 13-16/Q.703
SLC COC CES Signalling link code
Recommendation Q.704, S 15, Figure 14/Q.704
SLM GCS GES Signalling link management
Recommendation Q.704, SS 12.1 and 12.6,
Figures 23/Q.704, 25/Q.704, 26/Q.704,
27/Q.704, 29/Q.703
SLS SCS SES Signalling link selection code
Recommendation Q.704, S 2.2.4, Figures
3/Q.704, 4/Q.704, 26/Q.704, A-3.1/Q.705
SLTA ESCA AMPS Signalling link test message acknowledgement
SLTM ESCO MPES
PAGE38 Fascicle VI.7 - Abbreviations
Signalling link test message
Figure 2/Q.707
Fascicle VI.9 - Abbreviations PAGE1
English French Spanish Meaning
SMH OMS TMS Signalling message handling
Recommendation Q.704, S 2, Figures 23/Q.704,
43/Q.704
SP PS PS Signalling point
Figures 8/Q.704, 23/Q.704, 24/Q.704,
26/Q.704, 27/Q.704, 30/Q.704, 31/Q.704,
42-44/Q.704
SPRC CPS CPS Signalling procedure control
Recommendation Q.724, S 10.1, Figures
1-7/Q.724
SRM GRS GRS Signalling route management
PAGE38 Fascicle VI.7 - Abbreviations
Recommendation Q.704, S 13, Figures 23/Q.704,
25-27/Q.704, 43/Q.704
SSB OCC ABO Subscriber-busy signal (electrical)
Table 3/Q.723, Figure 3/Q.724
SSF DSS CSS Sub-service field
Recommendation Q.704, S 13.1.1,
Recommendation Q.723, S 1.2
SST TSI TIE Send-special-information-tone signal
Figures 1-7/Q.724
ST ST SFN End-of-pulsing signal
Fascicle VI.9 - Abbreviations PAGE1
Recommendation Q.724, S 1.3
STLC ESC CPES Signalling link test control
Figures 25/Q.704, 26/Q.704, 2/Q.707
STM GTS GTS Signalling traffic management
Recommendation Q.704, S 4, Figures 23/Q.704,
25-27/Q.704, 30/Q.704, 35/Q.704, 39/Q.704,
43/Q.704
STP PTS PTS Signalling transfer point
Figure 4/Q.701, Recommendation Q.705, S 3,
Figures A-1/Q.705, A-2/Q.705, Recommendation
Q.706, S 4.3.3, Table 3/Q.706
SU TS US Signal unit
PAGE38 Fascicle VI.7 - Abbreviations
Figures 2/Q.703, 7/Q.703
SUA DSA ADGSL Software generated group
unblocking-acknowledgement messages
Table 3/Q.723
SUERM STTS MUS Signal unit error rate monitor
Figures 7/Q.703, 8/Q.703, 11/Q.703, 18/Q.703
SUM SEE ESNC Sample unsuccessful backward setup
information message
Recommendation Q.723, S 3.7.1
TB TEM MT Transmission buffer
Fascicle VI.9 - Abbreviations PAGE1
Figures 7/Q.703, 13/Q.703, 15/Q.703
TC GT CT Transaction Capabilities
Recommendations Q.700 and Q.771-Q.775
TCAP SSGT PACT Transaction Capabilities Application Part
Recommendations Q.700 and Q.771-Q.775.
TCBC GTCN TCRS Changeback control
Recommendation Q.704, S 6, Figures
27-29/Q.704, 31/Q.704
PAGE38 Fascicle VI.7 - Abbreviations
English French Spanish Meaning
TCOC GTCS TCER Changeover control
Recommendation Q.704, S 5, Figures
27-30/Q.704, 37/Q.704
TCRC GTRN TCRC Controlled rerouting control
Recommendation Q.704, S 8, Figures 27/Q.704,
29/Q.704, 33/Q.704, 45/Q.704
TFA TAO TRA Transfer-allowed signal
Table 1/Q.704
TFM TF MTR Transfer-prohibited and transfer-allowed
Fascicle VI.9 - Abbreviations PAGE1
messages
Table 1/Q.704
TFP TIO PTR Transfer-prohibited signal
Table 1/Q.704
TFRC GTRS TCRF Forced rerouting control
Recommendation Q.704, S 7, Figures 27/Q.704,
29/Q.704, 32/Q.704
TLAC GTSD TCDE Link availability control
Recommendation Q.704, Figures 27-31/Q.704,
37/Q.704
TSFC GTFX CFTS Signalling traffic flow control
PAGE38 Fascicle VI.7 - Abbreviations
Figures 27/Q.704, 29/Q.704, 34/Q.704
TSRC GTAC CEN Signalling routing control
Recommendation Q.704, Figures 27-34/Q.704,
36/Q.704, 37/Q.704, 44-46/Q.704
TUP SSUT PUT Telephone user part
Recommendation Q.701, S 2.1, Figure 2/Q.701,
Recommendation Q.721, S 1
TXC EMI CT Transmission control
Figures 8/Q.703, 9/Q.703, 12-16/Q.703
UBA DBA ARD Unblocking-acknowledgement signal
Fascicle VI.9 - Abbreviations PAGE1
Table 3/Q.723
UBL DBO DBL Unblocking signal
Table 3/Q.723
UBM EE MEI Unsuccessful-backward-set-up-information
message
Table 3/Q.723
UNN NNU NNA Unallocated-national-number signal
Table 3/Q.723, Figure 3/Q.724
UP SSU PU User part
PAGE38 Fascicle VI.7 - Abbreviations
Figure 2/Q.704
Fascicle VI.9 - Abbreviations PAGE1
