G
LOSSARY
94
fax mode
The mode used by a modem to send and
receive data in
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
Signals can 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
Signals can 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.
Hz
Hertz, a frequency measurement unit used
internationally to indicate cycles per second.
