3Com AccessBuilder 980/000048/001 User Manual
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Contents
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Troubleshooting Guide 3-3Modem - Telephone Line ConnectionConnection Problems in Answering a CallModem does not receive a dial toneAttach a telephone direct to the wall outlet to check if a dial tone exists.Make sure the telephone line is connected to the appropriate modem’srear panel PSTN jack.Modem does not go off-hook and answer an incoming callCheck that the auto-answer ring count configuration option(S-Register 0) is set to a value other than 0.Check that the DTE is providing DTR to the modem.If the DTE does not provide DTR to the modem, check that the modem’sDTR signalling configuration option is set to ignore the state of DTR.Check that all cables are attached to the right connectors at the rear ofthe modem.Modem goes off-hook, answers, but does not connectPerform a local analogue loop test and check that data entered at theDTE is echoed back to the DTE.Check that the originating modem’s configuration is compatible withyour receiving modem’s configuration.Check that the originating modem recognizes your modem’s answer tone.Check that the originating modem supports your modem’s operatingprotocols.Force your modem to operate using the same transmission protocol asthe originating modem to see if they connect. |
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