Carrier Access Access Navigator user manual

Bandwidth

Baud

Bellcore

Bipolar

Violation

Bit Error Rate

Bits Per Second

Blocked Call

Basic Rate

Interface

Call Reference Value

Channel

Channel Bank

Channel Service Unit

Circuit

violations that is identified by the recipient and then removed in the decoding process to recreate the original string of zeros.

Information-carrying capacity of a communication channel. Analog bandwidth is the range of signal frequencies that can be transmitted by a communication channel or network. Digital bandwidth is the transmission capacity or data rate expressed in bits or bytes per second.

Bits audio. An early telecommunications term referring to the communications rate, measured in bits per second, at which data can be transmitted through a modem or serial data line. Most equipment provide a selection of fixed baud rates, such as 9600 bps.

Bell Communications Research. See Telcordia.

BPV. A violation of the bipolar transmission pattern, indicating a transmission error. For example, in AMI coding a BPV occurs when succeeding “ones” (pluses) are sent at opposite polarities. B8ZS patterns contain intentional bipolar violations for substitution codes, which are not counted as errors.

BER. The number of coding violations detected in a unit of time, usually one second. BER is the ratio of errored bits received to the total bits transmitted.

bps. The transmission rate for digital information.

A call that cannot be connected because a line is not available.

See Integrated Services Digital Network Basic Rate Interface.

CRV. A number used by central office switches to uniquely identify a DS0 or subscriber line. In the Access Navigator, the GR-303 switch uses the CRV to set up crossconnects in the Access Navigator between switch DS0s and drop DS0s.

The smallest subdivision of a circuit that provides a type of communication service, usually a one-directional connection between two points. A DS0 is often treated as a channel because it includes both transmission and receive paths.

A CSU with service cards that provide individual analog lines to subscriber phones.

CSU. A device used to connect a DS1 (T1) digital phone line from the central office to a PBX or computer system. A CSU performs line-conditioning and equalization functions, and responds to loopback commands from the central office.

A communications path or network, usually a pair of channels providing bi- directional communication.