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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
Capable of signal flow in both directions
simultaneously. In microcomputer
communications, may refer to the suppression
of the online local echo.
half duplex
Capable of signal flow in both directions, but
signals may flow 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.
G
LOSSARY
Hz
Hertz, a frequency measurement unit used
internationally to indicate one cycle 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.
The initials ITU-T represent the French name.
In English it is known as the International
Telegraph and Telephone Consultative
Committee.
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