Zhone 3821Plus User's Guide download pdf (Page 161)

Glossary-13821-A2-GB20-40 January 1999

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, 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 by issuing an

AT&W0 command.

analog loop 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 it is ready to receive an incoming call. For example, an ATA

(Answer) command has been issued to place the modem into online answer mode. The

modem has been forced off-hook and is generating an answer tone, beginning the

handshaking process with the calling modem.

ASCII This code (American Standard Code for Information Interchange) is a 7-bit code which

establishes compatibility between data services. ASCII is the standard for data

transmission over telephone lines. The ASCII code consists of 32 control characters

(nondisplayed) and 96 displayed characters.

asymmetric rate In V.34, the ability of a device to transmit at a different rate than it receives.

Async Dial A factory preset configuration area containing the configuration options most often used

in asynchronous dial networks.

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 DTE, that allow control of the

modem while in Command mode. All commands must begin with the characters AT and

end with a carriage return.

AT prefix A prefix issued before every AT command (except A/ and +++) which identifies the

DTE’s data rate, parity, and character length.

autobaud To automatically determine the asynchronous DTE data rate.

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Zhone 3821Plus User's Guide Page 161