DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Additional Maintenance Procedures
6-11DS1 CPE Loopback Jack (T1 Only)
6
Configurations without a Smart Jack
1. Install the loopback jac k at the point where the cabling from the ICSU
plugs into the “d umb” block. If there is m ore than one “dumb” b lock,
choose the one that is closest to the Interface Termination feed or the fiber
MUX. This provides maximum coverage for loop back jack tests. Refer to
Figure 6-4 and Figure 6-5.
Installation
1. To install the loopback jack, simpl y disconnect the RJ-48 (8-wide)
connector (typic ally an H600-383 cable) at the app ropriate interface point
and connect the loop back jack in series with the DS1 span. See Figure 6-1
through Figure 6-5.
2. Plug the H600-383 cable from the ICSU into the female c onnector on the
loopback jack.
3. Plug the male connector on the loop back jack cab le into the network
interface point.
NOTE:
Do not remove the loopback jac k after installation. This is not a test
tool and should always b e available to remotely test a DS1 span.
Administration
1. At the management terminal, enter change ds1
location
(the DS1
interface circuit p ack for which the loopb ack jack was installed).
2. Be sure the near-end CSU type is set to integrated.
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 tech nician 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 pack and the 120A2 (or
later) ICSU have been successfully te sted using approp riate maintenance
procedures. The DS1 span test c onsists of 2 sequential parts. Each p art 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 part s are successful.