Digicom 3910, 3911 operation manual Glossary

Glossary

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
transmission	(five to eight bits) and one or more stop bits at the end.
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 September 1998 Glossary-1