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Glossary of Abbreviations
System Hardware Manual
The following table includes common abbreviations used throughout this
document that are listed in alphabetical order.
Abbreviations
ACD
Automatic Call Distribution
Provides a cost-effective method for supervising incoming
telephone traffic and associated staff activity.
AIS
Alarm Indication Signal
Replaces the normal traffic signal when a maintenance
alarm indication is activated. An AIS signal is transmitted
downstream to indicate an upstream failure was detected.
BNC
Bayonet-Neill-Concelman
Connector for slim coaxial cables. This is similar to ones
used with Ethernet.
BPV
Bipolar Violation
Indicates the presence of two consecutive one bits of the
same polarity on a T carrier line.
BRI
Basic Rate Interface
ISDN subscriber interface. BRI has two bearer B-channels
at 64 Kbps per second and a D-channel at 16 Kbps per
second.
voice, video conferencing, group 4 facsimile machines, and
other similar types of transmissions. The data D-channel
used to bring in information about incoming calls and take
out information about outgoing calls. BRI can also be used
to access slow-speed data networks such as videotex and
packet switched networks.
BRI has two standards:
U Interface for 2-wire
T Interface for 4-wire
Appendix A
Definition
The bearer B-channels are provided for PCM
A - 1
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