AT&T DEFINITY Remote Port Security Device - Manual (Page 97)

Replacing the PBX Modem
To test whether the problem diagnosed by the Modem Ring Test is in the PBX modem, perform
the following procedure:
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Disconnect the modular telephone plug from the PBX modem and connect a touch-tone
telephone to the modem.
Call the RMATS channel from a touch-tone telephone and perform the Modem Ring Test
described in this chapter.
If the phone you substituted for the modem rings, have someone answer it. If the connection
is fine, the problem is in the modem.
If the call fails to ring the telephone, or the connection is faulty, it is likely that the modem is
fine. Go to the next step.
Remove the touch-tone telephone and reconnect the modem, but this time use a different
cable between the RPSD Lock and the modem. Call the modem again from a telephone.
If the system functions properly, the problem is in the cable.
If the system continues to malfunction, go to the next step.
Remove the substitute cable and put the original back in. Disconnect the RPSD Lock from
the CO line and replace the Lock with a touch-tone telephone. Again, call the RMATS
channel from a second telephone.
If the telephone you substituted for the Lock rings, answer it. If the phones work properly,
the problem is in the RPSD Lock. Replace the Lock. See
Replacing the RPSD Lock in
this chapter.
5-10 Troubleshooting