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Glossary
B
Bell 103J
An AT&T Bell standard for 300 bps data transmission.
Bell 212A
An AT&T Bell standard for 1200 bps data transmission.
bps
Bits per second. Indicates the speed at which data is transmitted
between devices.
buffer
A storage area used to compensate for differences in data flow
rate when transmitting data from one device to another.
C
CD
Carrier Detect. A signal between the local and remote ends of a
network indicating energy exists on the transmission circuit.
command line
Contains the command(s) instructing the modem to perform a
function. Command lines begin with the AT prefix, and are
executed when you press the Enter key.
Command mode
One of two modem operating modes. When in Command mode,
the modem accepts commands instead of transmitting or
receiving data. See also Data mode.
COM port
Communications port. A computer's serial communications port
used to transmit to and receive data from a modem. The modem
connects directly to this port.
GL-2
Issue 2
May 1995
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