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178
C
HAPTER
5: P
ATH
B
UILDER
S330 D
IAGNOSTICS
AND
P
ERFORMANCE
S
TATISTICS
Using Loopbacks
Loopbacks allow you to check circuit continuity between one point and another.
You should use the PathBuilder S330/S310 loopback feature to check continuity to
the nearest point first, and if the circuit is valid to that point, then loop to the next
point. If a circuit has been compromised, isolating the problem between two
points should help you identify and resolve the problem.
To access the loopback modes supported by the PathBuilder S330/S310 switch:
1
From the main menu, select
[3] Fault Management
to open the Fault Management
menu shown earlier in Figure 148.
2
Select
[5] Loopback
from the Fault Management menu to open the Loopback
menu, shown in Figure 151.
Figure 151
Loopback Menu
3
Select the card type for which you want to conduct the loopback to open the
Loopback menu for the selected port. Figure 152 shows the Loopback menu for
the OC3/STM-1 port.
If you select a card type for which the PathBuilder S330/S310 switch
does not
support loopbacks, a message appears, informing you that no loopback feature is
available for that card type.
If you select
a multiple-port card
, you must also select the port for which you want
to configure the loopback.