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Active (Operating)
A configuration area containing configuration options currently in use by the modem. When a
power cycle occurs, a reset is performed, or a save is issued using the DCP, this area is updated
with the contents of Active (Saved).
Active (Saved)
A nonvolatile configuration area containing the most recently saved configuration options. Any
changes made to configuration options can be saved using either the DCP's Save command or
by issuing an AT&W0 command.
ADp
Advanced Diagnostic protocol. An enhanced diagnostic communication protocol used with the
6700 and 6800 Series NMS and with certain front panel diagnostic functions.
analog loop
A test in which the modem's transmit VF signal is looped to its receiver.
analog signal
A type of signal composed of continuously variable values, used to transmit voice or data over
telephone lines.
Answer mode
The state of a modem that is ready to receive an incoming call.
ASCII
American Standard Code for Information Interchange. The standard for data transmission over
telephone lines. A 7-bit code establishes compatibility between data services. The ASCII code
consists of 32 control characters (nondisplayed) and 96 displayed characters.
Async Dial
A factory-preset configuration area containing the configuration options most often used in
asynchronous dial networks.
asynchronous
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.
transmission
AT Command mode
The idle state prior to the device establishing a successful connection with a remote device. It is
from the AT Command mode that AT Commands are issued.
AT command string
Several AT commands issued at once. The string is preceded by an AT prefix.
AT commands
The group of commands used to control and configure a device through a DTE, such as a
personal computer. The commands must begin with the characters AT and end with a carriage
return.
AT prefix
A prefix issued before AT commands that identifies the DTE's data rate, parity, and character
length.
autobaud
The mode in which the device automatically determines the asynchronous DTE data rate.
automatic answer
A capability to respond to a call received over a dial line.
automatic rate
A feature which allows modems to adjust their signaling rate based on current line conditions.
control
backplane
A common bus at the rear of a nest or chassis that provides communications and power to
circuit card slots.
3910-A2-GN32-40
Glossary
September 1998
Glossary-1
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