User Guide

DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Maintenance Object Repair Procedures
Page 10-1601UDS1-BD (UDS1 Interface Circuit Pack)
10
DS1 board to the CSU Module (DS1 board edge, connection, and CSU Module
edge). This test will only be performed if the AT&T 120A1 CSU Module is present,
administered, and connected to a 1.544 Mbps TN464F DS1 circuit pack on the
back of the port carrier.
The test is destructive and can only be initiated by a system technician
demanded
test ds1-loop PCSS ds1/csu-loopback-tests command.
All trunks or ports on the UDS1 Interface circuit pack must be busied out via the
system technician busyout board command before running the ELB Test.
When the ELB Test is initiated, maintenance software sends an appropriate
message to the TN464F UDS1 Interface circuit pack to start the test. The board
will set up the ELB loopback, transmit a test pattern, and verify that the pattern is
received unaltered through the loopback. If the transmitted and received pattern
is different, the test fails.
In addition, the DS1 circuit pack hardware applies a DC current while the test is
running in order to detect any broken wires which may not be detected by the
loopback pattern itself.
When the test is complete, all trunks or ports on the TN464F UDS1 Interface
circuit pack are restored to the in-service state after the release board command
is entered.
Table 10-470. TEST #1210 CSU Equipment Loopback Test
Error
Code
Test
Result Description/ Recommendation
ABORT Internal System Error
1. Retry the
test ds1-loop PCSS
ds1/csu-loopback-tests
command at 1-minute
intervals a maximum of 5 times.
2. If the test continues to abort, escalate the problem.
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