Chapter 5: Troubleshooting
Page 5-4
IRM3 User’s Guide
5.2 TROUBLESHOOTING CHECKLIST
If your IRM3 is not operating properly, the following checklist describes
some of the problems that may occur with the IRM3 installed in an
MMAC, possible causes for the problem, and suggestions for resolving
the problem. Figure 5-1 shows the LED locations.
Table 5-2
Troubleshooting Checklist
Problem
Possible Causes
Recommended Action
No LEDs on.
Loss of power to the
MMAC.
Check that the MMAC power supply
module is properly installed and plugged
into a live outlet.
Check the power supply LEDs to see if
they are green.
No Local
Management
Password screen.
Terminal Setup not
correct.
Improper console
cable pin-outs.
Refer to Chapter 4 for setup procedures.
Refer to Chapter 4 or Appendix A for
console pinouts.
Cannot contact
IRM3 from in-band
management.
Improper Community
Names table.
IRM3 does not have an
IP address.
No link to device.
Refer to Chapter 4 for Community
Names table setup.
Refer to Chapter 4 for IP address
procedures.
Check link to device.
A port on the IRM3
cannot access the
network, while other
ports on the same
IRM3 are able to.
The port is off or
segmented.
Port cable is defective.
Use Local or Remote Management to
enable the port.
Use a different cable.
User parameters are
lost when device is
powered down.
Battery jumper (H1) is
in the wrong position,
or battery is not
charged.
Refer to Chapter 3 for the proper H1
jumper setting. If battery is defective, call
Cabletron Systems Technical Support.
No power to an
external transceiver
connected to AUI
port.
Fuse F1 is blown.
AUI cable is defective.
Replace fuse.
Replace AUI cable.
High number of
collisions on AUI
port.
External transceiver
has SQE enabled.
Disable SQE.
