3com S330 Manuale Utente

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, follow 
these steps:

1 From the Main menu, select [3] Fault Management to display the Fault 

Management menu shown earlier in Figure 133.

2 Select [5] Loopback from the Fault Management menu to display the Loopback 

Figure 136   Loopback Menu

3 Select the card type for which you want to conduct the loopback.

The Loopback menu for the selected port appears. Figure 137 shows the 
Loopback menu for the OC3/STM-1 port.

If you select a multiple-port card, you must also select the port for which you want 
to configure the loopback.