ARRIS TM602 User Guide - Manual (Page 68)

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Getting Battery USB Ethernet
Safety Started Installation Installation Drivers Configuration Usage Troubleshooting Glossary
– If so, unplug the RJ-11 connector at the back of the Telephony Port
and plug in a known working phone. If you now have dial tone, the
problem is with the house wiring. Contact your MSO or a qualified
wiring technician to correct the house wiring. If you still do not have
dial tone, contact your service provider.