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Diagnosing Problems from the ATM Media LEDs
The following section details problems that can occur with ATM media modules.
WRONG SLOT LED is ON.
Explanation: Either the ATM backplane is not installed in the ONcore or the ATM
media module has been inserted in an incorrect slot.
Steps to Take:
1. Check that the backplane is installed (in the upper part of the ONcore).
2. Check that the ATM media module has not been inserted in an incorrect slot (slot 9,
10, or 11), which is reserved for ATM Switch/Control modules.
No LED is ON.
Explanation: This is the default behavior when you install an ATM media module that
has never been used; the ports are disabled so no light is on. If this is not the case,
follow the steps below.
Steps to Take:
1. Check that the module is connected to the backplane correctly. Unplug the module,
then plug it back in carefully. When you feel that the module is almost inserted, use
the levers to push it in completely. (see Figure 2-2 on page 2-4.)
2. If the ports are not enabled, check that the module is working correctly by issuing
the SHOW MODULE and SHOW PORT commands.
3. Check that the power budget has not been exceeded. Before adding a power
supply, check that this is the real cause, by issuing the SHOW POWER BUDGET
command. If a DMM module is installed, this command must be issued from the
DMM console. If necessary, add a power supply.
Refer to the
3Com ONcore Hub Installation and Operation Guide
(17-00362) to see
if there is a problem associated with the power budget.
7-4 ONcore ATM Switch/Control Module: Installation and User's Guide