User`s guide

System Troubleshooting and Diagnostics
5.7 Using Loopback Tests to Isolate Failures
While the test is running, the LED display on the console module should
alternate between 6 and 3. A value of 6 latched in the display indicates a test
failure. If the test fails, one of the following parts is faulty: the KA52/53 or the
cabling.
To test out to the end of the console terminal cable:
1. Plug the MMJ end of the console terminal cable into the back BA42B.
2. Disconnect the other end of the cable from the terminal.
3. Place an H8572 adapter into the disconnected end of the cable.
4. Connect the H3103 to the H8572.
5. Cycle power and observe the LED.
5.7.2 Embedded Ethernet Loopback Testing
Note
Before running Ethernet loopback tests, check that the problem is not
due to a missing terminator on a ThinWire T-connector.
Test 5F is the internal loopback test for SGEC (Ethernet controller).
>>>T5F
For an external SGEC loopback, enter "1".
>>>T5F1
Before running test 5F on the ThinWire Ethernet port, connect an H8223
T-connector with two H8225 terminators.
Before running test 5F on the standard Ethernet port, you must have a
12–22196–02 loopback connector installed.
Note
Make sure the Ethernet Connector Switch is set for the correct
Ethernet port.
T 59 polls other nodes on Ethernet to verify SGEC functionality. The Ethernet
cable must be connected to a functioning Ethernet. A series of MOP messages
are generated; look for response messages from other nodes.
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