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 jack at the point where the cabling from the ICSU
plugs into the “dumb” block. If there is more than one “dumb” block,
choose the one that is closest to the Interface Termination feed or the fiber
MUX. This provides maximum coverage for loopback jack tests. Refer to
Figure 6-4
and
Figure 6-5
.
Installation
1. To install the loopback jack, simply disconnect the RJ-48 (8-wide)
connector (typically an H600-383 cable) at the appropriate interface point
and connect the loopback 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 connector on the
loopback jack.
3. Plug the male connector on the loopback jack cable into the network
interface point.
NOTE:
Do not remove the loopback jack after installation. This is not a test
tool and should always be available to remotely test a DS1 span.
Administration
1. At the management terminal, enter
change ds1
location
(the DS1
interface circuit pack for which the loopback jack was installed).
2. Be sure the
near-end CSU type
is set to
integrated
.
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.
