Demand test descriptions and error codes - Avaya Support

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 every 64-kbps (B-Chel) or subrate
chel corresponding to the DS1 facility needs to be looped around.
Figure 85: 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 chel-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 86: 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 85: 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.
912 Maintenance Alarms for Communication Manager, Media Gateways and Servers
Span
line
side
sync4 LJK 072501