Avaya Communication Manager Administrator's Manual page 1816

Glossary and Abbreviations
P
packet bus
A wide-bandwidth bus that transmits packets.
packet switching
A data-transmission technique whereby user information is segmented and routed in discrete data
envelopes called packets, each with its own appended control information, for routing, sequencing,
and error checking. Packet switching allows a channel to be occupied only during the transmission of
a packet. On completion of the transmission, the channel is made available for the transfer of other
packets. See also BX.25and packet.
PAD
Packet assembly/disassembly
paging trunk
A telecommunications channel used to access an amplifier for loudspeaker paging.
party/extension active on call
A party is on the call if he or she is actually connected to the call (in active talk or in held state). An
originator of a call is always a party on the call. Alerting parties, busy parties, and tones are not
parties on the call.
PBX
Private branch exchange
PC
See personal computer
PCM
See pulse-code modulation
PCOL
Personal central-office line
PCOLG
Personal central-office line group
PCS
Permanent switched calls
PDM
See processor data module
PDS
Premises Distribution System
PE
Processing element
PEC
Price element code
PEI
Processor element interchange
personal computer (PC)
A personally controllable microcomputer.
PGATE
Packet gateway
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(PC).
(PCM).
(PDM).
Administrator's Guide for Avaya Communication Manager
November 2003