The E1 interface of an AR router cannot start up after loopback is performed on the interface

When the E1 interface of an AR router cannot start up after loopback is performed on the interface:

If the E1 is in unframed mode, run the undo fe1 detect-ais(E1-F) command or undo detect-ais(CE1) command.

AIS alarms, which are also called the upstream alarms, are used to indicate that problems occur in the receiving line of the local end device or the far end device does not work properly. Disable the AIS detection when configuring the E1 interface.

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