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Asynchronous A transmission
method that uses start, stop, data, and
parity bits to exchange data.
ADPCM Adaptive Differential Pulse
Code Modulation, a data compression
technique from Microsoft.
A-law A method of data compression
that enables the sampling of sound at a
resolution of 16 bits, but that
generates the same quantity of data as
an 8-bit sampling rate.
ASVD Analog Simultaneous Voice
and Data. A modem mechanism which
allows you to hold a conversation and
transfer data at the same time.
AT command Is a set of commands
composed of a string of characters that
are used to determine the parameters
and control of a modem. Each
command is prefixed by the two letters
“AT” (Attention), hence the name AT
commands.
AVI files Audio-Video Interleaved
file format used with Microsoft’s Video
for Windows.
Basic MIDI format Allows MIDI
channels 13 to 16 of the General MIDI
operation mode to be used when notes
are played through MIDI.
Baud rate The signaling rate used to
transmit data.
BBS An abbreviation for Bulletin
Board System. A BBS employs special
communications software that allows
you to perform tasks such as send and
receive files, leave mail messages for
other BBS callers, read messages left
for you by other callers, and chat with
other callers who are also connected to
the BBS.
BIOS Basic Input/Output System.
Code within the computer that controls
the input and output data.
Bit per second (bps)
The speed at
which a modem sends or receives
information. If your modem is operating
at 28800 bits per second, for example, it
is transferring 28800 binary digits every
second.
Bus An electrical connection over
which information is transported.
Cache A block of memory used for the
temporary storage of data.
Calling tone Specific cadenced tone
sent by most of the modems after the
dialing sequence and before the
detection of the answer of the remote
system.
Call waiting A service provided by
some telephone companies. With Call
Waiting, a beep alerts you during a
conversation that another incoming
telephone call has arrived on your line.
Carrier signal High-pitched noise
that is emitted when two modems try to
make a data connection.
CD-ROM Compact Disc-Read Only
Memory. A storage device that uses
compact disc technology. CDs can store
data, but cannot be written to, hence
the term “read-only”.
Glossary