MAINT (EPN Maintenance Circuit Pack)
Issue 4 May 2002
10-1027555-233-123
Serial Channel Local Loop Around Test (#229)
This test checks the on-board circuitry of the EPN Maintenance circuit pack
associated with the serial links to the Expansion Interface circuit pack. Figure
10-63 on page 10-1028 shows the three serial interfaces on the EPN
Maintenance circuit pack and is meant to clarify that the two dealing with the
Expansion Links are being tested. A request is sent to the EPN Maintenance
circuit pack over the Active link via the Active Expansion Interface circuit pack
serial interface circuitry to test the serial interface circuitry of the standby
Expansion Interface circuit pack link. If a response is received, then by definition
the serial interface circuitry associated with the Active link is good.
2034 ABORT Background EPN Maintenance circuit pack maintenance is
running the MGR I Channel Local Loop Around Test.
1. Wait 30 seconds and retry the test a maximum of 5 times.
22801 ABORT Test disabled via software patch.
FAIL Test failed which means the EPN Manager I (G1) or G3MT
terminal is not usable.
1. Run the test three more times. Replace the EPN
Maintenance circuit pack if the test continues to fail.
PASS The serial interface circuitry on the EPN Maintenance circuit
pack which controls the EPN Manager I (G1) or G3MT
terminal is functioning properly. If there are still troubles with
the EPN Manager I (G1) or G3MT terminal, the problem may
be one of the following:
1. The EPN Manager I (G1) or G3MT terminal is not
configured properly. The connection between the EPN
Manager I (G1) or G3MT and the EPN Maintenance
circuit pack must be set up at 9600 baud.
2. The serial link from the back of carrier A to the EPN
management terminal may be defective. The serial link
consists of the connector on the back of carrier A labeled
TERM and the ribbon cable running to the EPN terminal.
3. The EPN terminal may be defective. Try another terminal.
4. Since this test is not 100 percent accurate, there may still
be problems with the EPN Maintenance circuit pack.
Table 10-371. TEST #228 MGR I Channel Local Loop Around Test — Continued
Error
Code
Te s t
Result Description/Recommendation
Continued on next page
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