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Glossary
GL-2
February 2001 3160-A2-GB21-90
Auxiliary Backplane
An 8-slot backplane that fit over one half of the open section of the 3000 Series Carrier. This
is a passive assembly that provides interconnection capability between 3151 CSUs and
3161 DSU/CSUs and provides all interface connectors.
AW G
American Wire Gauge. An indication of wire size. The heavier the gauge, the lower the
AWG number, and the lower the impedance.
B8ZS
Bipolar 8 Zero Substitution. Encoding scheme for transmitting clear channel signals over a
T1 line.
backup capability
The ability to reconfigure the DSU/CSU and restore data circuits through an external
backup device.
bandwidth
The range of frequencies that can be passed by a transmission medium, or the range of
electrical frequencies a device is capable of handling.
BES
Bursty Error Seconds. A second in which more than one but less than 320 CRC6 error
events have occurred.
bipolar signal
A signal in which successive ones (marks, pulses) are of alternating positive and negative
polarity, and in which a zero (space, no pulse) is of zero amplitude.
bit
Binary digit. The smallest unit of information, representing a choice between a one or a zero
(sometimes called mark or space).
bit stuffing
The insertion of ones into the outgoing bit stream to enforce ones density requirements.
block allocation
method
A method of allocating digital signal level 0 (DS0) channels as a group rather than
individually.
bps
Bits per second. Indicates the speed at which bits are transmitted across a data connection.
BPV
Bipolar Violation. In a bipolar signal, a one (mark, pulse) which has the same polarity as its
predecessor.
byte
A sequence of successive bits (usually eight) handled as a unit in data transmission.
CCITT
Consultative Committee on International Telegraphy and Telephony. An advisory committee
established by the United Nations to recommend communications standards and policies. It
was renamed ITU in March 1993.
CD
Carrier Detect. The received line signal detector. V.24 circuit 109.
channel
A bidirectional DS0, voice, or data path, for electrical transmission between two or more
points. Also called a circuit, line, link, path, or facility.
channel allocation
Assigning specific DS0 channels in the device to specific interfaces (Network, DTE
Drop/Insert, etc.).
CHAP
Challenge Handshake Authentication Protocol. A security technique that allows a user
password to be encrypted for transmission.
character
A letter, figure, number, punctuation, or other symbol.
CID branch
Customer Identification branch or the DSU/CSU menu tree.
client
A device that receives a specific service, such as database management, from a server.
CLOCK IN interface
The external clock interface on the DSU/CSU.
ClrReg branch
Clear Performance Registers branch of the DSU/CSU menu tree.
Cnfig branch
Configuration branch of the DSU/CSU menu tree.
coding
A technique used to accommodate the ones density requirements of E1 lines.