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TM508/TM512 Installation Guide Release 5 Standard 1.2 Mar 2007

3 Troubleshooting

Information

This chapter describes troubleshooting features.

Troubleshooting Interfaces

The Telephony Modem provides two troubleshooting interfaces: the

front panel LEDs and the telemetry block.

Front Panel LEDs The front panel LEDs provide information about DOCSIS and tele-

phony status.

The LED patterns shown in this section are valid for the default firm-

ware version installed on the Telephony Modem. See the Troubleshoot-

ing Guide corresponding to the actual firmware installed for updated

LED patterns.

Power-On Self Test Failure Pattern

When a Telephony Modem fails power-on self test (POST), it repeats

the following sequence:

• POWER LED on for 2 seconds; other LEDs off

• All LEDs flash rapidly (10 times per second) for 10 seconds

A Telephony Modem repeatedly displaying this sequence is defective

and should be replaced.

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Arris Touchstone TM508 Guida di Installazione Pagina 37