Maintenance-Object Repair Procedures
555-233-143
8-1522
Issue 1 May 2002
Facility Fault Sectionalization
DS1 facility fault sectionalization involves looping around the DS1 signal at on-site
access points to localize the source of the problem to equipment and wiring on
either the near side or far side of the loop-around point.
!
WARNING:
The facility fault sectionalization technique disrupts service. When you
perform the loop around on a facility, make sure it is not the on-line
synchronization reference or a system outage will occur.
When you use this technique to investigate problems on facilities with multiplex or
DACS equipment, the technique becomes cumbersome because every 64-kbps
(B channel) or subrate channel corresponding to the DS1 facility needs to be
looped around.
shows a sequence of units (1 though n) that may be connected as the
on-site equipment. A typical example is the case where the only on-site
equipment is channel-terminating equipment designated Unit #1. A more
complex, less typical example might have a DACS as Unit #1, a protection switch
as Unit #2, and a DS1-level microwave radio system as Unit #3.
The flowchart in
gives an overview of the facility fault
sectionalization technique. It is important that you know the configuration and
wiring of the equipment for the problem facility in order to support this technique.
Figure 8-93.
Manual Loop-Around for Facility Fault Sectionalization
Since the technique is time consuming, fix any DS1-BD, UDS1-BD, STRAT-3, or
SYNC errors first that are not slip errors.
TN722,
TN767, or
TN464
DS1 interface
Manually
wired
loop-around
Pairs open
at next unit
Next unit
(#1)
Next unit
(#N)
Span
line
side
sync4 LJK 072501
Switch
Summary of Contents for S8700 Series
Page 50: ...Maintenance Architecture 555 233 143 1 26 Issue 1 May 2002 ...
Page 74: ...Initialization and Recovery 555 233 143 3 12 Issue 1 May 2002 ...
Page 186: ...Alarms Errors and Troubleshooting 555 233 143 4 112 Issue 1 May 2002 ...
Page 232: ...Additional Maintenance Procedures 555 233 143 5 46 Issue 1 May 2002 ...
Page 635: ...status psa Issue 1 May 2002 7 379 555 233 143 status psa See status tti on page 7 406 ...
Page 722: ...Maintenance Commands 555 233 143 7 466 Issue 1 May 2002 ...