DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-1578SYNC (Synchronization)
9
Facility Fault Sectionalization
DS-1 facility fault sectionalization involves looping around the DS-1 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 looparound 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 all of the 64
Kbps (B-channels) or subrate channels corresponding to the DS-1 facility need
to be looped around.
Figure 9-100
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 DS-1-level microwave radio system as Unit #3.
The flowchart in Figure 9-101
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 9-100. Manual Looparound 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.
Next
Unit
(#1)
Pairs Open
at Next
Unit
Manually
Wired
Loop-Around
TN722,
TN767, or
TN464
DS1 interface
G3r System
Span
Line
Side
Next
Unit
(#N)
