Glossary
Issue 8.0 July 2002
GL-3
Asynchronous
Refers to network elements that are not timed from references traceable to a single timing source.
ATM
Asynchronous Transfer Mode — A new technology based on a simple, fixed-length packet (or cell)
format that allows integrated networking of voice, data, and video traffic. The packet length is set at
53 bytes. The first 5 bytes are reserved for address and control fields, and the remaining 48 bytes
carry data.
AUTO
Automatic — One possible state of a low speed port or slot. When a port is in the automatic state
and the presence of a good signal is detected, the port is automatically placed in the IS (in service)
state. When a slot is in the automatic state and the presence of a circuit pack is detected, the slot is
automatically placed in the EQ (equipped) state.
Autonomous Indicators
Autonomous indicators are those indicators that are subject to incoming signal alarm delay. These
include office alarm outputs, parallel telemetry outputs, TL1 autonomous messages, the alarm
LEDs (CR, MJ, and MN) on the user panel, and the network element status field in the upper
left-hand corner of the CIT.
B
B3ZS
Bipolar 3-Zero Substitution — A line coding method that replaces a string of three zeros with a
sequence of symbols having some special characteristic.
B8ZS
Bipolar 8-Zero Substitution — A line coding method that replaces a string of eight zeros with a
sequence of symbols having some special characteristic.
BCLAN
Board Controller Local Area Network — The internal local area network that provides communica-
tions between the Line Controller circuit pack (terminals only) and board controllers on the circuit
packs associated with an OC-48 high speed line. In the ^FT-2000 OC-48 Repeater Bay, the
BCLAN provides communications between the System Controller circuit pack and board controllers
on the circuit packs.
BDFB
Battery Distribution and Fuse Bay.
BER
Bit Error Rate — The ratio of bits received in error to bits sent.
BIP
Bit Interleaved Parity — A method of error monitoring over a specified number of bits (BIP-3 or
BIP-8).
BIP-N
Bit Interleaved Parity - N — A method of error monitoring. With even parity, an N-bit code is gener-
ated by the transmitting equipment over a specified portion of the signal in such a way that the first
bit of the code provides even parity over the first bit of all N-bit sequences in the covered portion of
the signal. The second bit provides even parity over the second bits of all the N-bit sequences
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