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ACCULINK 316x DSU/CSU
Glossary-2 January 1997 3160-A2-GB21-50
Auxiliary Backplane An 8-slot backplane that fits over one half of the open section of the 3000 Series
Carrier. This is a passive assembly that provides interconnect capability between
3151 CSUs and 3161 DSU/CSUs and provides all interface connectors.
AW G American Wire Gauge. An indication of wire size.
backup capability The ability to reconfigure the DSU/CSU and restore data circuits through an
external backup device.
bandwidth The range of frequencies that a circuit can pass. The greater the bandwidth, the
more information that can be sent in a given amount of time.
BES Bursty Errored Seconds. Seconds with more than one, but less that 320 CRC6
errors.
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 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 small group of bits (usually 8) that is handled as a unit of data.
B8ZS Bipolar with Eight Zero Substitution. A line coding technique used to accommodate
the ones density requirement of T1 lines.
CCITT The International Consultative Committee for Telegraphy and Telephony. (It is now
renamed as the ITU.)
CD Carrier Detect. The received line signal detector. V.24 circuit 109.
channel An independent data path.
channel allocation Assigning specific DS0 channels in the DSU/CSU to specific interfaces (network,
DTE Drop/Insert, etc.).
CHAP Challenge Handshake Authentication Protocol.
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 T1 lines.
COM port The communications port on the DSU/CSU.
community name An identification used by SNMP to grant an SNMP server access rights to a MIB.
COMSPHERE A product family and a registered trademark.