Verilink AS2000: The Basics (880-502981-001) Product Manual Uživatelský manuál stáhnout pdf (Strana 124)

Acronyms and Definitions

Glossary-4 Verilink Access System 2000: Basics

bSee

bit

BSee

byte

B3ZS See

bipolar three-zero

substitution (B3ZS)

B8ZS See

binary eight-zero

substitution (B8ZS)

BABT British Approvals Board for

Telecommunications, a standards

organization.

backbone network The core portion of a network

connecting various nodes. A

group of devices connected by

facilities operating at a higher

speed than individual links to

routers, muiltiplexers, and other

components on the network edge.

backup channel A seondary circuit path which

assumes a primary circuit function

if the primary circuit fails.

bandwidth The maximum available data rate

that information is sent over a

facility. The bandwidth of a T1 line

is 1.544 Megabits per second. The

bandwidth of an E1 line is 2.048

Megabits per second.

baud A measurement of signaling speed

for data transmission devices

(modem). Baud rate can be

determined by calculating the

maximum number of signaling

elements (or discrete waveforms)

generated per second.

BER See

bit error rate (BER)

BECN Backward Explicit Congestion

Notification. When a frame relay

network experiences congestion,

the network sends a bit to the

sending device to notify it that

congestion avoidance procedures

need to be initiated.

BERS See

bit error rate seconds

(BERS)

BES See

bursty-errored second

(BES)

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