Specifications

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3.8.1 Loop test (optical loop system only)
This test checks the line status of the forward and reverse loops upon completion of
the wiring of the optical loop system. Also, when a loopback is being executed, it
checks the station that executes the loopback.
For example, in the system shown below, where the IN/OUT connectors of station
number 4 are connected in reverse, conduct a loop test using the GX Developer
connected to station number 1.
The monitor screen shown below is displayed to verify that the loopback is executed
between station number 3 and 5 because station number 4 is faulty.
GX Developer
Station
No.1
Loopback
IN OUT
IN OUT
IN OUT
INOUT INOUT
Loopback Faulty station
Station
No.2
Station
No.3
Station
No.4
Station
No.5