AT&T DataPort PCX Modem User Manual page 73

Glossary
A
Active
A nonvolatile configuration area containing the most recently
saved configuration options.
analog signal
A type of signal used to transmit data over telephone lines.
Answer mode
The state in which a modem is ready to receive an incoming call.
This occurs when an ATA (Answer) command is issued.
asynchronous transmission
A data transmission that is synchronized by a transmission start
bit at the beginning of a character (five to eight bits) and one or
more stop bits at the end.
AT command set
A group of commands, issued from an asynchronous computer,
that allows control of the modem while in Command mode.
AT command string
This consists of several AT commands issued at once. The
string is preceded with an AT prefix.
AT prefix
A prefix issued before every AT command (except A/ and +++)
which identifies the computer's data rate, parity, and character
length.
Issue 2 July 1995
GL-1