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DEFINITY Enterprise Communications Server Release 6
Maintenance for R6vs/si
555-230-127
Issue 1
August 1997
Routine Maintenance Procedures
Page 5-71Install DS1 CPE Loopback Jack (T1 Only)
5
3. On page 2 of the form, change the supply CPE loopback jack
power field to y.
NOTE:
Setting this field to y informs the technician that a loopback jack is
present on the facility. This allows a technician to determine that the
facility is available for remote testing.
4. Enter save translation to save the new information.
DS1 Span Test
This test should only be performed after the DS1 circuit pack and the 120A2 (or
later) ICSU have been successfully tested using appropriate maintenance
procedures. The DS1 span test consists of 2 sequential parts. Each part provides
a result indicating if there is a problem in the CPE wiring. CPE wiring may be
considered problem-free only if the results of both parts are successful.
The first part of the span test powers-up the loopback jack and attempts to send
a simple code from the DS1 board, through the wiring and loopback jack, and
back to the DS1 board. Maintenance software waits about 10 seconds for the
loopback jack to loop, sends the indication of the test results to the management
terminal, and proceeds to the second part of the test.
The second part of the test sends the standard DS1 3-in-24 stress testing pattern
from the DS1 board, through the loopback jack, and back to a bit error detector
and counter on the DS1 board. The bit error rate counter may be examined at will
via the management terminal, and provides the results of the second part of the
test. The test remains in this state until it is terminated so that the CPE wiring may
be bit error rate tested for as long as desired.
1. Busy out the DS1 circuit pack by entering busyout board UUCCSS
(where UUCCSS is the cabinet, carrier, and slot number of the DS1
board).
2. At the management terminal, enter change ds1 <location> and verify the
near-end csu type is set to integrated.
3. Change to page 2 of the DS1 administration form and confirm that the TX
LBO field is 0dB. If not, record the current value and change it to 0dB for
testing. Press
Enter to implement the changes or press Cancel to change
nothing.
4. Enter test ds1-loop <location> cpe-loopback-jack. This turns on simplex
power to the loopback jack and waits about 20 seconds for any active
DS1 facility alarms to clear. A “PASS” or “FAIL” displays on the terminal.
This is the first of the 2 results. A “FAIL” indicates a fault is present in the
wiring between the ICSU and the loopback jack. The loopback jack may
also be faulty. A “PASS” only indicates that the loopback jack looped
successfully, not that the test data contains no errors. If a “PASS” is
obtained, continue with the following steps.