61200.130L1-1 FSU User Manual 117
Glossary
Glossary
2-wire Switched 56
A Northern Telecom proprietary 56 kbps switched digital data service offered by
telco service providers, and delivered to users over a single pair of copper wires.
Compatible with the ADTRAN DSU III S2W and with the FSU 2-wire Switched
56 TDM option.
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 ADTRAN DSU III S4W and with the FSU 4-wire Switched 56 TDM option.
American National Standards Institute (ANSI)
Devices and proposes recommendations for international communications
standards.
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
congestion 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).