A CDE Definition
An ITU standard (1968) for automatic calling and/or answering equipment on dial-up lines. It has three modes: asynchronous (rarely used), character-oriented synchronous (bisync) and bit-oriented synchronous (HDLC/SDLC). Both synchronous versions were used in IBM AS/400 and other small-to-medium sized computers that did automatic dialing for remote job entry.
Due to the popularity of the Hayes AT Command Set, V.25bis is not used as widely in North America. It does not perform modem configuration functions and is limited to dialing and answering calls. See AT command set.
AT command set
(ATtention command set) A series of machine instructions used to activate features on an analog modem. Developed by Hayes Microcomputer Products and officially known as the Hayes Standard AT Command Set, it is used entirely or partially by most every modem manufacturer. AT is a mnemonic code for ATtention, which is the prefix that initiates each command to the modem. See Hayes Smartmodem.
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