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Abbreviations and Acronyms
Modem 3600 G-3
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
S
SD Send Data
SDLC Synchronous Data Link
Control (IBM)
SGND, Signal Ground
SG
SH Switch Hook
SNR Signal / Noise Ratio
SPID Service Profile Identifier
SQ Signal Quality
SQM Signal Quality Monitor
SS Systems Status
STX Start of Text
SYN Synchronization Character
T
TC Transmit Clock
TD Transmit Data
TE Terminal Equipment
TEI Terminal Endpoint
Identifier
TELCO Telephone Company
TELSET Telephone Set
TM Test Mode
TP Test Pattern
TR Terminal Ready
TST Test
TX Transmit
U
UART Universal Asynchronous
Receiver / Transmitter
USOC Universal Service
Ordering Code
V
V. CCITT Code Designation
V.24 List of definitions for
interchange circuits
between data terminal
equipment and data
circuit-terminating
equipment (and
provisional
amendments, May 1977)
Vac Volts Alternating Current
VAL Valid
Vdc Volts Direct Current