Server Alarms - Avaya Support

SYNC (Port Network Synchronization)
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.
Figure 120: Manual Looparound for Facility Fault Sectionalization 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 Figure 121: Facility Fault Sectionalization 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 120: Manual Looparound for Facility Fault Sectionalization
Switch
TN722,
TN767, or
TN464
DS1 interface
Manually
wired
loop-around
Pairs open
at next unit
Next unit
(#1)
Next unit
(#N)
Since the technique is time consuming, fix any DS1-BD (DS1 Interface Circuit Pack), UDS1-BD
(UDS1 Interface Circuit Pack), STRAT-3 (Stratum-3 Clock), or SYNC (Port Network
Synchronization) errors first that are not slip errors.
Span
line
side
sync4 LJK 072501
Communication Manager Release 5.0 Issue 4 January 2008 1271