Instruction manual

DEFINITY® Business Communications System and GuestWorks® Issue 6
Overview
555-231-208
Issue 1
April 2000
Glossary and Abbreviations
GL-25
OSI
Open Systems Interconnect
OSS
Operations Support System
OSSI
Operational Support System Interface
OTQ
Outgoing trunk queuing
outgoing gateway
A PBX that routes an incoming call on a trunk administered for Supplementary Services Protocol B
to a trunk
not administered for Supplementary Services Protocol B.
P
PACCON
Packet control
packet
A group of bits (including a message element, which is the data, and a control information element
(IE), which is the header) used in packet switching and transmitted as a discrete unit. In each
packet, the message element and control IE are arranged in a specified format. See also packet
bus and packet switching.
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.25
and packet.
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
PCM
See pulse-code modulation (PCM)
.
PCOL
Personal central-office line
PCOLG
Personal central-office line group