Multi-Tech Systems MT5634ZBA - Manual (Page 46)

Chapter 6 - Troubleshooting
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MultiModemDID User Guide
DID Troubleshooting
• Make sure that the MT5634ZBA-DID parameters match the DID line. Refer to the *D command.
Also, verify that your fax software is configured to match the analog DID trunk line and the
MT5634ZBA-DID parameters.
• If callers are receiving an immediate busy signal or are allowed a short connection but become
unexplectedly disconnected after a short time, try reversing the TIP and RING wires. The central
office is sensitive to the DC polarity and this will reverse the polarity.
• If the MT5634ZBA-DID line is out of service, verify that the DC voltage is being applied by the
MT5634ZBA-DID to the DID line. This voltage should be applied to the line at all times, even
when the PC is not in use. The central office will check the line occasionally and if a voltage is
not sensed, the line may be put out of service. If this has occurred, call the phone company to get
the line back in service. Be sure to have you DID line information available.
• Note that the DID and POTS ports on the MT5634ZBA-DID cannot operate simultaneously. You
can use only one port at a time since they share common circuitry within the modem.
• If the MT5634ZBA-DID is totally inoperational, verify that the power supply shipped with modem
is connected properly to the modem and the wall outlet.
Important: Use the power source shipped with your modem. If you use any other power source,
you could damage the MT5634ZBA-DID and void the warranty.