SA
-FOM4 Installation Description
SA
-FOM4-2.0-20030102
3. Loopback Testing
This section explains the loopback testing theory. For
operation details, please refer to Unit 4 DIP Switch
Operation or Unit 5 CID Console Operation.
SA
-FOM4 is equipped with loopback testing function. This
function enables user to locate the fail point of signal
connection or equipment.
Notice
Please notice that while performing loopback testing,
either local loopback or remote loopback, the
corresponding E1 tributary should be set to Out of Service
(OOS) status.
3.1 E1 Local Loopback (E1LLB)
E1 Local Loopback loops the received E1 signal
immediately to the transmit direction at the E1 input for any
E1 channel as shown in the figure listed below.
NEAR END
FAR END
4*E1
(EIO)
OPTICAL
(OPT)
4*E1
(EIO)
OPTICAL
(OPT)
E1 LOCAL
LOOPBACK
(T1LLB)
Figure 4 Local Loopback Diagram
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Summary of Contents for SA-FOM4
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