This read-write object sets the loopback mode of this xDSL interface, such as local or remote, analog or digital, and the desc notes the interface remains in that loopback mode, with service inhibited, until this object is explicitly set back to disabled. An admin uses it to isolate faults by looping the signal at a specific point in the local or remote path. For example, a technician trying to determine whether a fault lies on the customer side or the central-office side of a DSL line would set cXdslModeLoopback to loopbackDigitalRemote to test the remote segment specifically, then set it back to disabled once finished.