BBE
See “background block errors” (p. GL-3) for definition.
BDI
See “backward defect indication” (p. GL-3) for definition.
BER
See “bit error rate” (p. GL-4) for definition.
bidirectional line switched ring (BLSR)
A survivable SONET transport architecture that protects against cable cuts and node failures by
providing duplicate, geographically diverse paths for each service. Network elements are
interconnected in a closed fiber loop (four fibers for a four-fiber BLSR architecture or two fibers
for a two-fiber BLSR). A service can reach its destination by traveling in either direction around
the ring. Exactly one-half of the bandwidth available between adjacent nodes in each direction is
used for working traffic, with the remaining bandwidth available for protection.
bit error rate (BER)
BER measures how accurately a bitstream is transmitted through a system. It measures how many
bits are received in error, compared to how many bits are sent.
BLSR
See “bidirectional line switched ring” (p. GL-4) for definition.
BOF
See “band optical filter” (p. GL-3) for definition.
broadband (BB)
A technology that refers to the always-open gateway to Internet-connected services delivered at
lightning-fast speeds.
broadband amplifier (BBA)
Optical amplifier that supports broadband technology.
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C CAD
See “channel add/drop card” (p. GL-5) for definition.
central office (CO)
A CO can be a building, a switch, or collection of switches where subscriber lines are joined to
switching equipment that connects the subscribers to each other, other subscribers, and/or long
distance subscribers.
CFR
Code of Federal Regulations.
Glossary
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GL-4
1830 PSS-36/PSS–32/PSS-16/PSS-4
8DG60888CAAA Release 3.6.0 and 3.6.1
Issue 1 June 2011
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