ABBREVIATIONS
GPO


 
A&B  A&B type coin collecting Box
Adj  Adjustable
Aka  also known as
Alt  Alternative
AR  Alternative recall i.e. Timed break recall
Auto  Automatic
BLF  Busy lamp field
BPO  British Post Office
BS  Bellset
BT  BRITISH TELECOM
BTRL  British Telecom Research Laboratories
C/O  Cut off
CB  Central Battery (System)
CBS  Central Battery Signalling
CCB  Coin collecting box
CCT  Circuit
CCU  Common control unit
CO  CALL OFFICE
CPU  Central processor unit
CSA  CALLED SUB ANSWERED
DDI  Direct Dialling In
DEL  Direct Exchange Line (a normal subscribers line)
Dept  Department
DIS  Disconnection
DISA  Direct Inward System Access
DP  distribution point
DS  Dual signalling
DSS  Direct station select
DT  Dial tone
DTMF  Dual Tone Multi Frequency
Dual sig  Dual Signalling - i.e. both loop disconnect or DTMF
ER  Earth Recall
Exch  Exchange/s
Extn  Extension
FNF  Fault not found
FUW  For use with
GPO  GENERAL POST OFFICE
Inst  Instrument
LB  Local Battery
LCD  Liquid Crystal Display
LD  loop dial
LJU  Line Jack Unit
LNR  Last Number Redial
MDF  Main distribution frame
MF  Multi frequency
Mag  Magneto System
Manu  Manufacturer
Mem  Memory
N.T.C.  National Telephone Company
No.  Number
Nos.  Numbers
NU  Number Unobtainable
OH  OVERHEAD
OHD  On Hook Dialling
PABX  Private branch exchange system
PB  Push Button
PBX  Private branch exchange
PET  Permanent Engaged Tone
PG  permanent glow
PI  Postal Instruction
PMBX  Private manual exchange system
PO  POST OFFICE
POT  plain old telephone
pps  Pulses Per Second
PST  Plug and socket Telephone
RR  Register Recall (Timed Break)
RTNR  Ring tone no reply
RWT  Right when tested
Recall  Could be either Earth Loop or Timed Break or both
S/S  Shared Service
SARCRAM
SC  Self Contained (Loop disconnect keypad)
SC  Short circuit
SNR  Saved Number Redial (stores last number dialled for redial)
Sim  Similar to
T  Tone
TAMS  Telephone answering machines
TB  Time Break
TBR  Time break recall
TELE  Telephone
TI  Telecom Instruction
Tele  Telephone
UAX  Unit Automatic Exchange
UG  UNDERGROUND

 

 
 
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Last revised: September 19, 2010

FM