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Troubleshooting
CMTS Power and Booting Issues
149
! The OK LED of a NIC Module does not illuminate.
! The OPERATIONAL LED of a NIC Access Module does not illuminate.
! The CMTS could not boot from the flash disk. When the CMTS boots, it first attempts to
start the software image from the flash disk. If this fails, you can remove the flash disk to
force the CMTS to boot from the hard disk. Contact customer support for learn how to
remove the flash disk. Normally, you want the CMTS to boot from the flash disk.
! The CMTS was powered down and powered up in quick succession. We recommend
that you wait at least 10 seconds after powering down the CMTS before you power it up.
CMTS Powers Down
If the CMTS powers down, this might be caused by one or more of the following:
! Power has been disrupted to the system. See “CMTS Is Not Powering Up” on page 148.
! The power supplies in the CMTS have reached their over-temperature shutdown limit.
1. Check the ambient temperature in the headend or hub in which the CMTS resides.
The air cooling system might not be fully operative, and the ambient operating
temperature might have exceeded the maximum specification for the G10 CMTS of
40°C. See if an SNMP message was sent to the NMS or an entry was added to the
event log indicating the temperature of the CMTS exceeded the high threshold
(defined by the high statement).
2. Check that all empty module slots and power supply bays contain air management
modules, panels, and filler panels. In addition, the power supply faceplate must
always be installed while the CMTS is operating. These requirements ensure that
proper air ventilation occurs throughout the chassis.
3. Ensure that proper clearance is maintained between the G10 CMTS chassis and its
surroundings to allow adequate air ventilation to flow into the air intakes and out of
the air exhaust. See “Rack Mounting” on page 94 for clearance details.
4. One or more of the fans within a fan tray might have stopped rotating while the
CMTS was operating. If an SNMP message was sent to the NMS, an entry was added
to the event log indicating a fan failure, or a fan tray LED was illuminated red before
the CMTS powered down, you must replace the fan tray that contains the faulty fan.
A faulty Chassis Control Module will prevent the CMTS
from successfully booting up and might give the false
appearance that the DOCSIS Modules and the NIC Modules
are also faulty (based on their LED status). Determine the
operational status of the Chassis Control Module before
declaring any DOCSIS Modules or NIC Modules as faulty.