Cisco ONS 15454 SDH Specifications Page 465

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Glossary
GL-3
Cisco ONS 15454 SDH Installation and Operations Guide, R3.3
May 2002
ARP
Address Resolution Protocol.
APSB
Alarm Protection Switching Byte.
ATAG
(Autonomous Message Tag). ATAG is used for TL1 message sequencing. See also CTAG.
ATM
Asynchronous Transfer Mode.
AWG
American Wire Gauge
B
B8ZS
(Binary 8-zero Substitution). A line-code type, used on T1 circuits, that substitutes a special code whenever 8 consecutive zeros
are sent over the link. This code is then interpreted at the remote end of the connection. This technique guarantees ones density
independent of the data stream. Sometimes called bipolar 8-zero substitution.
Backbone
The part of the network that carries the heaviest traffic or joins LANs together.
BER
(Bit Error Rate). Ratio of received bits that contain errors.
BIC
Backplane Interface Connector.
BIP
Bit Interleaved Parity.
Bit rate
Speed at which bits are transmitted, usually expressed in bits per second.
BITS
(Building Integrated Timing Supply). A single building master timing supply that minimizes the number of synchronization
links entering an office. Sometimes referred to as a Synchronization Supply Unit.
BLSR
(Bidirectional Line Switched Ring). SONET ring architecture that provides working and protection fibers between nodes. If
the working fiber between nodes is cut, traffic is automatically routed onto the protection fiber. See also UPSR.
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