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DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Maintenance Object Repair Procedures
Page 10-859MAINT (EPN Maintenance Circuit Pack)
10
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
10-64 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.
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 10-242. TEST #228 MGR I Channel Local Loop Around Test — Continued
Error
Code
Test
Result Description/Recommendation
Continued on next page