User`s guide

GLOSSARY

fax mode

The mode in which the faxmodem is capable of

sending and receiving files in a facsimile format.

See definitions for V.17, V.27ter, V.29.

flow control

A mechanism that compensates for differences in

the flow of data into and out of a modem or other

device. See commands &Hn, &In, &Rn.

frame

A data communications term for a block of data

with header and trailer information attached. The

added information usually includes a frame number,

block size data, error-check codes, and Start/End

indicators.

full duplex

These signals will flow in both directions at the

same time over one line. In microcomputer

communications, may refer to the suppression of the

online local echo.

half duplex

These signals will flow in both directions, but only

one way at a time. In microcomputer

communications, may refer to activation of the

online local echo, which causes the modem to send

a copy of the transmitted data to the screen of the

sending computer.

Hertz is a frequency measurement unit used

internationally to indicate cycles per second.

ITU-T

An international organization that defines standards

for telegraphic and telephone equipment. For

example, the Bell 212A standard for 1200 bps

communication in North America is observed

internationally as ITU-T V.22. For 2400 bps

communication, most U.S. manufacturers observe

V.22 bis.