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Frequency-Shift Keying (FSK): The modulation scheme
used by
the ATARI 1030 Direct-Connect
Modem. FSK
shifts a
carrier signal from
one frequency to
another
while transmitting data.
Full-Duplex:
Data transmission in both directions
simultaneously. Similar to
a
phone conversation in
which
both parties can talk at the same time.
Half-Duplex:
Data transmission
in both
directions,
but on-
ly
one direction at
a
time. Similar
to
a CB conversation in
which
both parties
can talk, but
only
alternately.
Handshaking: An exchange of predetermined
signals
that takes place between two modems (and their respec-
tive
computers)
when a
telephone connection
is
estab-
lished. Only modems similarly
configured-for
example,
at
300 bps, full-duplex
transmission-can
"shake
hands"
and exchange data.
Parity Bit: A
binary digit added to a group of bits to make
the total of all bits odd
or
even. Parity
bits
provide a
method of checking characters
to verify accurate
transmission.
RS-232-C: A set of
rules
established
by
the
Electronics In-
dustry of America (EIA)
that
standardizes
the interface
requirements
between
modems
and
data
terminal equip-
ment,
including computers.
Serial Transmission: A
mode of data
exchange in
which
each bit is
sent
sequentially
rather
than simultaneously.
Start/Stop Bits:
Binary digits
that signal
the beginning
or
end
of
asynchronous
serial transmission.
Terminal Software: A computer program-such
as the
ModemLink program in your ATARI
1030
Direct-Connect
Modem-that
turns a microcomputer
into a
"smart" ter-
minal
capable
of interacting over telephone lines with
other computers.
X/ON-X/OFF:
Mnemonic abbreviations
for the
"start/stop
transmission"
signals sent by a receiving
modem; they
tell
a transmitting
modem when
to
start
or
stop sending
information.
17
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