Glossary-3
autocall
Technique used by voice ports to establish a switched virtual circuit to a
predefined destination without the telephone equipment sending dialing
digits. Similar to the async channel
fixed destination
.
backbone
The primary path of the network or LAN over which the majority of traffic is
routed.
backup link
See
secondary interconnect link.
backward explicit congestion notification (BECN)
A bit set by a frame relay network to notify the data terminal equipment
(DTE) interface device that congestion avoidance procedures should be
initiated by the sending device.
baud
A unit of signalling speed. The speed in baud is the number of discrete
conditions or signal events per second. If each signal event represents one
bit, the baud rate is the same as bps. If each signal event represents more
than one bit, as in quadrature amplitude modulation, the baud rate is
smaller than bps.
BCC, block check character
A character added to the end of a transmission block for the purpose of error
detection.
Bc, committed burst size
The maximum amount of data in bits that a network agrees to transfer
under normal conditions over a measurement interval (T). Data may or may
not be contiguous. Bc is negotiated with the carrier provider.
Be, excess burst size
The maximum amount of uncommitted data in bits that the network will
attempt to deliver over a measurement interval (T). This data may or may
not be contiguous. Be is negotiated with the carrier provider.
bit
Contraction of binary digit. This is the smallest unit of information and the
basic unit in digital data communications. A bit can have a value of zero or
one (mark or space in data communications terminology).
