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61200214L1-20 IQ Probe User Manual D-1

Appendix D

Glossary

ANSI

American National Standards Institute. Devises and proposes recom-

mendations for international communications standards.

ASCII

American National Standard Code for Information Interchange. The

standard and predominant 7-bit (8-bit with parity) character code

used for data communications and data processing.

asynchronous

A method of data transmission which allows characters to be sent at

irregular intervals by preceding each character with a start bit, fol-

lowed by a stop bit.

attenuation

The loss of signal amplitude during transmission. The received sig-

nal is lower in signal amplitude than the transmitted signal due to

losses in the transmission medium (resistance in the cable). Attenua-

tion is measured in decibels.

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).

BECN

Backward explicit congestion notification. A bit set by a frame relay

network to notify an interface device (DTE) that congestion avoid-

ance procedures should be initiated by the sending device.

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