Troubleshooting Checklist
MicroMMAC Installation Guide
Page 5-3
5.2 TROUBLESHOOTING CHECKLIST
If your MicroMMAC is not operating properly, Table 5-1 describes some
of the problems that may occur, possible causes for the problem, and
suggestions for resolving the problem.
Table 5-1
Troubleshooting Checklist
Problem
Possible Causes
Recommended Action
No LEDs on.
Loss of Power.
Check that the MicroMMAC
has adequate power.
Cannot contact the
MicroMMAC from
in-band
management.
Improper
Community Names
table.
MicroMMAC does
not have an IP
address.
No link to device.
Refer to the
MicroMMAC Local
Management User’s Guide for
Community Names Table setup
and IP address assignment
procedures.
Check the link to the
MicroMMAC.
User-entered
parameters (IP
address,
Community Names,
etc.) are lost when
device is powered
down.
NVRAM reset
switch has been
toggled and
user-entered
parameters have
been reset to the
factory default.
See Chapter 2 for proper use of
the NVRAM switch.
If NVRAM is defective, call
Cabletron Systems Technical
Support.
No power to an
external
transceiver
connected to an
EPIM-A.
AUI cable may be
defective.
Transceiver may be
defective.
EPIM is defective.
Replace AUI cable.
Replace transceiver.
Replace EPIM.
High Number of
collisions on EPIM
ports.
External
transceiver has
SQE enabled.
Disable SQE.
