Juniper CBL-M40-PWR-AU Manuel D’Utilisation

Glossary

Appendix D

Glossary

A

ATM adaptation layer. A series of protocols enabling various types of traffic, including voice, 
data, image, and video, to run over an ATM network. 

Add/drop multiplexer. SONET functionality that allows lower-level signals to be dropped from 
a high-speed optical connection.

American National Standards Institute. The United States’ representative to the ISO.

Address Resolution Protocol. Protocol for mapping IP addresses to MAC addresses. 

Autonomous system. Set of routers under a single technical administration. Each AS 
normally uses a single interior gateway protocol (IGP) and metrics to propagate routing 
information within the set of routers. Also called routing domain.

Application-specific integrated circuit. Specialized processors that perform specific functions 
on the router.

Asynchronous Transfer Mode. A high-speed multiplexing and switching method utilizing 
fixed-length cells of 53 octets to support multiple types of traffic.

See AS.

B

Forms the rear of the FPC card cage. Provides data transfer, power distribution, and signal 
connectivity.

The range of transmission frequencies a network can use, expressed as the difference 
between the highest and lowest frequencies of a transmission channel. In computer 
networks, greater bandwidth indicates faster data-transfer rate capacity. 

Bell Communications Research. Research and development organization created after the 
divestiture of the Bell System. It is supported by the regional Bell holding companies 
(RBHCs), which own the regional Bell operating companies (RBOCs).

Bit error rate test. A test that can be run on a T3 interface to determine whether it is 
operating properly.

Border Gateway Protocol. Exterior gateway protocol used to exchange routing information 
among routers in different autonomous systems. 

See BERT.