DEFINITY ECS Release 8.2 Maintenance for R8.2csi
555-233-119 Issue 1
April 2000
Maintenance for csi systems
1-73Install DS1 CPE Loopback Jack (T1 Only)
1
3. On page 2 of the form, ch ange the supply CPE loopback jack
power field to y.
NOTE:
Setting this field to y informs the tec hnician that a loopbac k jack is
present on the facility. This allows a technician to d etermine 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 pac k and the 120A2 (or
later) ICSU have been successfully te sted using app ropriate maintenance
procedures. The DS1 span test c onsists of 2 sequential parts. Each part provides
a result indicating if there is a p roblem in the CPE wiring. CPE wiring may be
considered p roblem-free only if the results of both p arts are successful.
The first part of the span test powers-up the loop back jack and attempts to send
a simple code from the DS1 board , through the wiring and loopback jac k, and
back to the DS1 board. Maintenanc e software waits about 10 second s for the
loopback jac k to loop, sends the indic ation of the test results to the management
terminal, and proceed s to the second p art of the test.
The second part of the test sends the standard DS1 3-in-24 stress testing patter n
from the DS1 board, through the loopb ack jack, and b ack to a bit error detec tor
and counter on the DS1 board. The bit error rate c ounter may be examined at will
via the management terminal, and p rovides 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 b y entering busyout board UUCCSS
(where UUCCSS is the cabinet, carrier, and slot numb er 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 ad ministration form and confirm th at the TX
LBO field is 0dB. If not, record the current value and cha nge it to 0dB for
testing. Press Enter to implement the ch anges or press Cancel to chang e
nothing.