Glossary and Abbreviations
Issue 5 July 2001 89
P
PBX
Private branch exchange
PRI
See Primary Rate Interface (PRI).
Primary Rate Interface (PRI)
A standard ISDN frame format that specifies the protocol used between two or more communications
systems. PRI runs at 1.544 Mbps and, as used in North America, provides 23 64-kbps B-channels (voice or
data) and one 64-kbps D-channel (signaling). The D-channel is the 24th channel of the interface and contains
multiplexed signaling information for the other 23 channels.
principal
A terminal that has its primary extension bridged on one or more other terminals.
principal (user)
A person to whom a telephone is assigned and who has message-center coverage.
private network
A network used exclusively for the telecommunications needs of a particular customer.
public network
The network that can be openly accessed by all customers for local and long-distance calling.
Q
queue
An ordered sequence of calls waiting to be processed.
S
SAC
Send All Calls
simulated bridged appearance
The same as a temporary bridged appearance; allows the terminal user (usually the principal) to bridge onto
a call that had been answered by another party on his or her behalf.
single-line phone
A phone served by a single-line tip and ring circuit (models 500, 2500, 7101A, 7103A).
split
See AD.
status lamp
A green light that shows the status of a call appearance or a feature button by the state of the light (lit,
flashing, fluttering, broken flutter, or unlit).
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