Instruction manual

Glossary-13920-A2-GH30-40 October 1998
Glossary
Active (Operating) A configuration area containing configuration options currently in use by the modem.
Any time a power cycle occurs or 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.
ADp Advanced Diagnostic protocol. An enhanced diagnostic communication protocol used
with the 6800 Series NMS and with certain DCP diagnostic functions.
analog loop See local analog loop.
analog signal A signal, such as a voice, that varies continuously.
Answer mode The modem is in a state where it is ready to receive an incoming call.
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. Refer to Appendix E.
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 mode The idle state prior to the modem establishing a successful connection with a remote
modem. It is from the AT Command mode that AT Commands are issued.
AT commands AT commands are issued from an asynchronous DTE, such as a PC, and control the
modem’s operation and software configuration. 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 The modem automatically determines the asynchronous DTE data rate when using AT
commands.
automatic answer A capability to respond to a call received over a dial line.