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edge switch 2/16 service manual Glossary–5
Glossary
B
b
See bit.
B
See byte.
backbone
Cable on which two or more stations or networks may be attached, typically used to link
computer networks at one site with those at another. Smaller branch networks are sometimes
called ribs.
backplane
The backplane provides direct current (DC) power distribution and connections for all logic
cards.
backup field-replaceable unit
Backup FRU. When an active FRU fails, an identical backup FRU takes over operation
automatically (failover) to maintain director or switch and Fibre Channel link operation. See
also active field-replaceable unit.
backup FRU
See backup field-replaceable unit.
bandwidth
(1) The amount of data that can be sent over a given circuit. (2) A measure of how fast a
network can move information, usually measured in Hertz (Hz).
baud
The unit of signaling speed, expressed as the maximum number of times per second the signal
can change the state of the transmission line or other medium. The units of baud are seconds to
the negative 1 power. Note: With Fibre Channel scheme, a signal event represents a single
transmission bit.
BB_Credit
See buffer-to-buffer credit.
beaconing
Use of light-emitting diodes (LEDs) on ports, port cards, field-replaceable units (FRUs), and
switches to aid in the fault-isolation process. When enabled, active beaconing will cause LEDs
to flash in order for the user to locate field-replaceable units (FRU’s), switches, or directors in
cabinets or computer rooms.
ber
See bit error rate.