Cisco DPC2203C, Installation And Operation Manual

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Chapter 4 Troubleshooting the Installation
54 72-4017315-01 Rev B
Troubleshooting for Telephony Installations
This section provides troubleshooting suggestions and check and correct tips for
telephony installations.
Common Troubleshooting Suggestions
The modem does not register a cable connection
The modem works with a standard, 75-ohm, RF coaxial cable. If you are using a
different cable, your cable modem will not function properly. Contact your service
provider to determine whether you are using the correct cable.
There is no dial tone when I lift the telephone handset

Your telephone wiring may be connected to the wrong RJ-11 port on the cable
modem. The cable modem has two telephone ports. Verify that you are
connected to the correct telephone port.

There may be a problem with your telephone set. Use a different telephone set
and listen to hear dial tone.

There may be a problem with your home telephone wiring. Use a telephone and
connect directly to the same RJ-11 port on the back of the unit. If the dial tone is
working here but does not work at other locations in the home, a professional
may need to diagnose and repair a problem with your telephone wiring.

Verify that the phone company has removed the previous telephone service from
your home telephone wiring.

Your telephone service may not be enabled from your cable telephony service
provider. Contact your cable telephony service provider for more information.