Cabletron Systems 3T02-04 User Manual

For both types of tests, normal operation is indicated when generated 
packets are received back (after looping) without errors. For remote 
loopback tests, the ATX creates LLC Type 1 test packets for LANs and 
PPP echo-request packets for WANs and UARTs.

Both types of loopback tests can be initiated by the NMS, and test results 
are reported to the NMS.

The ATX diagnostic results are indicated in two ways: by observing the 
front panel LEDs (which are explained later in this chapter) or by reading 
NMS trap messages. Both power-up and loopback diagnostics produce 
traps, which are sent to the NMS and may be logged for future reference. 
In some cases it may be more convenient to simply observe the LEDs, but 
in most cases traps provide more information. There are no LEDs for the 
loopback tests—the results of these tests must be observed (i.e., accurate 
packet transmission) or read using an NMS (i.e., examine traps).

If the Token Ring module fails to power up when the ATX is on and 
functioning properly:

1. Check the status of ports using LCM.

2. Reset the Token Ring module and observe the power-up sequence 

again.