Appendix D. Glossary - ADTRAN Express 5200 User Manual

Glossary
Appendix D
4-wire Switched 56
An AT&T proprietary 56/64 kbps switched digital data service offered by telco
service providers and delivered to users over 4 copper wires. Compatible with
the Express 5200 4-wire Switched 56 DBU option.
American National Standards Institute (ANSI)
Devices and proposes recommendations for international communications stan-
dards.
asynchronous
A method of data transmission which allows characters to be sent at irregular
intervals by preceding each character with a start bit, followed by a stop bit.
backward explicit congestion notification (BECN)
A bit set by a frame relay network to notify an interface device (DTE) that con-
gestion avoidance procedures should be initiated by the sending device.
bandwidth
The bandwidth determines the rate at which information can be sent through a
channel (the greater the bandwidth, the more information that can be sent in a
given amount of time).
bridge
A device that supports LAN-to-LAN communications. Bridges may be
equipped to provide frame relay support to the LAN devices they serve. A
frame relay capable bridge encapsulates LAN frames in frame relay frames and
feeds them to a frame relay switch for transmission across the network. A frame
relay capable bridge also receives frame relay frames from the network, strips
the frame relay frame off each LAN frame, and passes the LAN frame on to the
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