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Glossary
GL-3
Cisco 10008 Router Hardware Installation Guide
OL-0659-13
B
Backplane
The circuit board at the back of the chassis that all components plug into. It provides the physical
connection between an interface processor or line card, and the data and power distribution buses inside
a chassis.
Bellcore
Bell Communications Research. Former name of the organization that performs research and development
on behalf of the Regional Bell Operating Companies (RBOCs). Bellcore is now called Telcordia.
BER
Bit error rate. The ratio of received bits that contain errors.
BGP
Border Gateway Protocol. An interdomain routing protocol that replaces EGP. BGP exchanges
connection information with other BGP systems. It is defined by RFC 1163.
Bit error rate
See BER.
Border Gateway
Protocol
See BGP.
Broadcast
Data packet that is sent to all nodes on a network. Broadcasts are identified by a broadcast address.
Compare with Multicast and Unicast.
C
CCITT
Consultative Committee for International Telegraph and Telephone. International organization
responsible for the development of communications standards. Now called the ITU-T. (See ITU-T.)
CEF
Cisco Express Forwarding. An advanced Layer 3 IP switching technology designed for
high-performance, highly resilient Layer 3 IP backbone switching. CEF optimizes network
performance and scalability for networks with large and dynamic traffic patterns, such as the Internet,
on networks characterized by intensive Web-based applications or interactive sessions.
Central Office
See CO.
Channel
Communication path. Multiple channels can be multiplexed over a single cable in certain
environments.
Cisco Express
Forwarding
See CEF.
Cisco IOS
Cisco system software that provides common functionality, scalability, and security for Cisco products.
Cisco IOS allows centralized, integrated, and automated installation and management of internetworks,
while ensuring support for a wide variety of protocols, media, services, and platforms.
Clear channel DS3
A framed DS3 signal which is not multiplexed from 28 DS1 signals. Sometimes referred to as
unchannelized DS3.
CLI
Command line interface. Interface that allows the user to interact with the operating system by entering
commands and optional arguments at the command prompt.
CO
Central office. The local telephone company office to which all local loops in a given area connect and
in which circuit switching of subscriber lines occurs.