Справочник Пользователя для Juniper CBL-M40-PWR-AU
Glossary
223
Appendix D
Glossary
A
AAL
ATM adaptation layer. A series of protocols enabling various types of traffic, including voice,
data, image, and video, to run over an ATM network.
data, image, and video, to run over an ATM network.
ADM
Add/drop multiplexer. SONET functionality that allows lower-level signals to be dropped from
a high-speed optical connection.
a high-speed optical connection.
ANSI
American National Standards Institute. The United States’ representative to the ISO.
ARP
Address Resolution Protocol. Protocol for mapping IP addresses to MAC addresses.
AS
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.
normally uses a single interior gateway protocol (IGP) and metrics to propagate routing
information within the set of routers. Also called routing domain.
ASIC
Application-specific integrated circuit. Specialized processors that perform specific functions
on the router.
on the router.
ATM
Asynchronous Transfer Mode. A high-speed multiplexing and switching method utilizing
fixed-length cells of 53 octets to support multiple types of traffic.
fixed-length cells of 53 octets to support multiple types of traffic.
autonomous system
See AS.
B
backplane
Forms the rear of the FPC card cage. Provides data transfer, power distribution, and signal
connectivity.
connectivity.
bandwidth
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.
between the highest and lowest frequencies of a transmission channel. In computer
networks, greater bandwidth indicates faster data-transfer rate capacity.
Bellcore
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).
divestiture of the Bell System. It is supported by the regional Bell holding companies
(RBHCs), which own the regional Bell operating companies (RBOCs).
BERT
Bit error rate test. A test that can be run on a T3 interface to determine whether it is
operating properly.
operating properly.
BGP
Border Gateway Protocol. Exterior gateway protocol used to exchange routing information
among routers in different autonomous systems.
among routers in different autonomous systems.
bit error rate test
See BERT.