Lucent Technologies Release 7 Facility Fault Sectionalization

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 lo oping around the DS-1 signal at
on-site access points to l ocalize the source of the prob lem to equipment and
wiring on either the near side or far sid e of the loop-around po int.
!WARNING:
The facility fault sectionalization tec hnique disrupts ser vice. When you
perform the looparound on a facility, make sure it is not the on-line
synchronization reference or a system outag e will occur.
When you use this technique to investigate problems on facilities with mu ltiplex
or DACS equipment, the technique b ecomes cumbersome b ecause all of the 64
Kbps (B-channels) or sub rate channels corresp onding to the DS-1 facility need
to be looped around .
Figure 9-100 shows a sequence of units (1 thou gh n) that may be connec ted as
the on-site equipment. A typ ical example is the case whe re the only on-site
equipment is channel-ter minating equipment d esignated Unit #1. A more
complex, less typic al example might have a DACS as Unit #1, a protec tion 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 techniq ue. It is important that you know the con figuration and
wiring of the equipment for the p roblem facility in order to sup port this technique.
Figure 9-100. Manual Looparound for Facility Fault Sectionalization
Since the technique is time c onsuming, 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)