NEC Electra Elite IPK II System Hardware Manual page 637

Glossary of Abbreviations
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The following table includes common abbreviations used throughout this document
that are listed in alphabetical order.
Abbreviations
ACD
AIS
BHCA
BNC
BPV
BRI
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System Hardware Manual
Automatic Call Distribution
Provides a cost-effective method for supervising incoming telephone
traffic and associated staff activity.
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.
Business-Hour Call Attempts
The number of times a telephone call is attempted during the busiest
hour of the day.
Bayonet-Neill-Concelman
Connector for slim coaxial cables. This is similar to ones used with
Ethernet.
Bipolar Violation
Indicates the presence of two consecutive one bits of the same polarity
on a T carrier line.
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. The bearer
B-channels are provided for PCM voice, video conferencing, group 4
facsimile machines, and other similar types of transmissions. The data
D-channel is 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
A - 1