Cabletron Systems 3E08-04 User's Guide download pdf (Page 189)

Diagnostics and Troubleshooting

7-5

Failure Indicators

If an FDDI or Ethernet module has failed, its front panel STATUS

LED will be off.

NMS Failure Traps

As each module completes its power-up diagnostics, it saves

information on any detected failures. These results are passed to

the NMS when the power-up diagnostics are completed (assuming

the ATX is operational). The results sent to the NMS indicate which

component has failed.

7.3 DIAGNOSTICS WHILE ATX IS OPERATIONAL

The following diagnostics may be performed while the ATX is

operational:

• Local and remote loopback tests on any port.

• Power-up diagnostics on an Ethernet or Token Ring module.

7.3.1 Loopback Tests

Built-in local and remote loopback tests can be used to test

individual ports while the ATX is operational. When in local

loopback, a port is disconnected from its network. The ATX

generates loopback packets for the port, and the port loops the

packets back without sending them onto its network.

During a remote loopback test, the port is in normal operation,

sending, and receiving packets to its network. The ATX generates

loopback packets which are sent out of the port to a particular

destination device on the port's network. The destination device

echoes the packet back onto the network, and the originating port

receives the packet.

For both types of tests, normal operation is indicated when

generated packets are received back without errors. For remote

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Cabletron Systems 3E08-04 User's Guide Page 189