Cisco ONS 15454 SDH Specifications Page 466

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Glossary
GL-4
Cisco ONS 15454 SDH Installation and Operations Guide, R3.3
May 2002
Blue band
Dense Wavelength Division Multiplexing (DWDM) wavelengths are broken into two distinct bands: red and blue. DWDM
cards for the ONS 15454 SDH operate on wavelengths between 1530.33nm and 1542.94nm in the blue band. The blue band is
the lower frequency band.
BNC
Bayonet Neill-Concelman (coaxial cable bayonet-locking connector).
BPDU
Bridge Protocol Data Unit.
Bridge
Device that connects and passes packets between two network segments that use the same communications protocol. In general,
a bridge will filter, forward, or flood an incoming frame based on the MAC address of that frame. See also MAC address.
Broadcast
Data packet that will be sent to all nodes on a network. Broadcasts are identified by a broadcast address. Compare with
multicast and unicast. See also Broadcast address.
Broadcast address
Special address reserved for sending a message to all stations. Generally, a broadcast address is a MAC destination address of
all ones. See also MAC address.
Broadcast storm
Undesirable network event in which many broadcasts are sent simultaneously across all network segments. A broadcast storm
uses substantial network bandwidth and, typically, causes network time-outs.
Bus
Common physical signal path composed of wires or other media across which signals can be sent from one part of a computer
to another.
C
C2 byte
The C2 byte is the signal label byte in the STS path overhead. This byte tells the equipment what the SONET payload envelope
contains and how it is constructed. See also SONET.
CAT 5
Category 5 (cabling).
CCITT
Comité Consultatif International Télégraphique et Téléphoniques. (Formerly ITU.)
CEO
Central Office Environment.
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