StarCAD 9000 allows loopbacks to be performed on the two Network Interfaces (T1/E1/xDSL).
To access the Loopback menu, go to the Maintenance Menu and select Loopbacks.... Choose the Span/NI (A or B) to apply the loopback to. Remote (towards the Network/away from the system) and Local (towards the system) loopbacks are supported.

Remember to remove loopback (select None) to put the unit back in service.
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