A-3
Cisco ASR 901 Series Aggregation Services Router Hardware Installation Guide
OL-23778-01
Appendix A Troubleshooting
Problem Solving
Troubleshooting Cables, and Connections
Network problems can be caused by a cable or cable connection, or external device such as a modem,
transceiver, hub, wall jack, WAN interface, or terminal. See
Table A-3 for information to help you isolate
the problem.
Table A-2 Interpreting Environmental Reporting Features
Symptom Possible Cause Corrective Action
The router operates at an
abnormally high temperature.
The following message appears
on the console screen:
%SYS-1-OVERTEMP: System
detected OVERTEMPERATURE
condition. Please resolve
cooling problem immediately!
There is a fan failure.
There is an air conditioner
failure in the room.
The air flow to cooling vents is
blocked.
Take corrective steps. For
information about environmental
operating conditions, see the
System Specifications, page 1-7).
Table A-3 Troubleshooting Cables, and Connections
Symptom Possible Cause Corrective Action
The router is experiencing
network problems.
The router does not boot
properly.
The router constantly or
intermittently reboots.
Check the router chassis or
software. For warranty
information, refer to the Cisco
Information Packet publication
that shipped with your router or
contact customer service.
The router boots, but the console
screen is frozen.
Verify that the parameters for
your terminal are set as follows:
(a) The terminal should have
the same data rate as the
router (9600 bps is the
default).
(b) 8 data bits.
(c) No parity generated or
checked.
(d) 2 stop bits.
The router powers on and boots
only when a particular cable is
disconnected.
There may be a problem with the
module or cable. For warranty
information, refer to the Cisco
Information Packet publication
that shipped with your order or
contact customer service.
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