Table of Contents
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P
PBX
Private Branch Exchange
PC
Personal Computer
pc
Printed circuit (board)
PIW
Power Indication
PN
Pseudo random
PND
Present Next Digit
POTS
Plain Old Telephone
Service
PRI
Primary
PRO
Program Option
PROG,
Programmable
PR
PROM
Programmable -
Read Only Memory
PSK
Phase Shift Keying
PSTN
Public Service Telephone
Network
PWI
Power Indication
Q
QAM
Quadrature Amplitude
Modulation
R
RAD
Random Access Method
RAL
Remote Analog Loopback
RAM
Random Access Memory
RC
Receive Clock
RCD
Receiver-Carrier Detector
RCV,
Receiver
RCVR
RD
Receive Data
RDL
Remote Digital Loopback
RI
Ring Indication
RL
Remote Loopback
RLO
Request List of Stored
Options
RLSD
Received Line Signal
Detector
RLV
Request List of Version
rms
Root-Mean-Square
RMT LB Remote Loopback
RNG
Ringback Detection
RO
Receive Only
ROM
Read Only Memory
RT
Remote Terminal
RTS, RS Request to Send
RX
Receive
Abbreviations and Acronyms
S
SD
SDLC
SGND,
SG
SH
SNR
SPID
SQ
SQM
SS
STX
SYN
T
TC
TD
TE
TEI
TELCO Telephone Company
TELSET Telephone Set
TM
TP
TR
TST
TX
U
UART
USOC
V
V.
V.24
Vac
VAL
Vdc
Modem 3600
Send Data
Synchronous Data Link
Control (IBM)
Signal Ground
Switch Hook
Signal / Noise Ratio
Service Profile Identifier
Signal Quality
Signal Quality Monitor
Systems Status
Start of Text
Synchronization Character
Transmit Clock
Transmit Data
Terminal Equipment
Terminal Endpoint
Identifier
Test Mode
Test Pattern
Terminal Ready
Test
Transmit
Universal Asynchronous
Receiver / Transmitter
Universal Service
Ordering Code
CCITT Code Designation
List of definitions for
interchange circuits
between data terminal
equipment and data
circuit-terminating
equipment (and
provisional
amendments, May 1977)
Volts Alternating Current
Valid
Volts Direct Current
G-3
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