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Troubleshooting
25
High Speed Cable Modem
(approximately 10 seconds). The cable modem is resetting its cable interface and
restarting the registration process. If this error message is seen multiple times in the
event log, contact the L3 ISP support and provide them the information about the T2
time-outs in the event log.
• T3 Timeout. The cable modem sent 16 ranging request messages without receiving a
ranging response message in reply from the CMTS. The cable modem is therefore
resetting its cable interface and restarting the registration process. This typically is
caused by noise on the upstream when the cable modem’s power level is insufficient to
transmit any messages. If the cable modem cannot raise its upstream transmit power
level to a level that allows successful communication within the maximum time-out
period, it resets its cable interface and restarts the registration process. This is an error in
the power levels and causes the connection to drop. Contact the L3 ISP support and
provide them the information about the T4 time-outs in the event log.
• T4 Timeout. The cable modem did not received a station maintenance opportunity in
which to transmit a ranging request message within the T4 time-out period (30 to 35
seconds). The cable modem is resetting its cable interface and restarting the registration
process. Typically, this indicates an occasional, temporary loss of service, but if the
problem persists, check for possible service outages or maintenance activity on this
particular MSO headend system. Contact the L3 ISP support and provide them the
information about the T3 time-outs in the event log.
• T6 Timeout. The cable modem sent three registration requests to the CMTS without
receiving a registration response within the T6 time-out period (3 seconds). The cable
modem is therefore resetting its cable interface and restarting the registration process.
This problem can also occur if the DOCSIS configuration file is corrupt, or some other
issue is occurring on the MSO network. Contact the L3 ISP support and provide them the
information about the T6 time-outs in the event log.
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