3Com AccessBuilder 980/000048/001 User Manual
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Contents
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Introduction 1-3n Asynchronous dial DTE data rates from 300 to 115200 bps.n Modem configuration changes using the DTE interface or throught theManagement Controller Module.n Compatibility with the industry standard AT command set.n Storage of up to 20 telephone numbers in directory locations.n Dialling using AT commands, CCITT V.25bis commands or by raisingDTR on the Host to modem interface, or by data being sent to the DTEinterface.n High-speed transmission using asynchronous or synchronous, or UNIXdevices over full duplex dial networks, and 2-wire or 4-wire lines.n Self testing facilities providing local and remote loopbacks, includingCCITT-compatible V.54.n Five factory-set configurations and two user definable configurations.n Front panel LEDs to inform you of the current status of any of the threemodems.n Easy to install, configure and support.Implementation of V.32terboSupport of the V.32terbo transmission protocol is included as a feature inthe modems. V.32terbo is a non-proprietary extension of the widely usedCCITT V.32bis standard which increases the maximum data signalling ratefrom 14400 to 19200 bps over dial-up links or private lines.Compatibility between V.32terbo and V.32bis is maintained in a similarmanner as it is between V.32bis and V.32, in that an identical trainingsequence is used by each standard and that V.32terbo uses a subset ofthe speeds available in V.32bis.By default, each modem’s factory configurations enable V.32terbo to benegotiated as the optimum data rate on any given link allowing a 33%increase in line throughput, to 19200bps to be used wherever possible.Where the quality of the line is not good enough to enabletransmission at 19200bps, an intermediate speed of 16800 bps can be |
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