DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Additional Maintenance Procedures
6-10DS1 CPE Loopback Jack (T1 Only)
6
DS1 CPE Loopback Jack (T1 Only)
Using the DS1 CPE Loopback Jack (apparatus code 700A, comcode
107988867), a technician can test the DS1 span between the system and the
network interface point. The loopback jack is required when DC power appears
at the interface to the ICSU.
The loopback jack isolates the ICSU from the DC
power and properly loops the DC span power
.
NOTE:
The loopback jack operates with any vintage of TN767E (or later) or
TN464F (or later) DS1 circuit packs and with G3V3 EDI Release 3 (or later)
software. The loopback jack operates with the 120A2 (or later) Integrated
Channel Service Unit (ICSU) only;
not
the 31xx series of Channel Service
Units or other external CSUs or earlier ICSUs.
Loopback Jack Installation
Configurations Using a Smart Jack
The preferred location of the loopback jack is at the interface to the Smart Jack.
This provides maximum coverage of CPE wiring when remote tests are run using
the loopback jack. If the Smart Jack is not accessible, install the loopback jack at
the extended demarcation point.
1. If there is no extended demarcation point, install the loopback jack directly
at the network interface point as shown in Figure 6-1
.
2. If there is an extended demarcation point and the Smart Jack is not
accessible, install the loopback jack as shown in Figure 6-2
.
3. If there is an extended demarcation point, but the Smart Jack is
accessible, install the loopback jack as shown in Figure 6-3
.
backup disk
20 Make extra backup copies of the new files
as needed.
set vector f spe-maint
1 Sets the coredump vector to take a
coredump when the system reboots.
Restore the system as described above.
Table 6-2. Software Update—Duplicated SPE — Continued
Step
Time
(min) Remarks
Continued on next page
