This read-write TruthValue allows an administrator to specify whether to respond to a remote loopback request on the E1/T1 interface, per its description. Enabling it lets the far end remotely trigger a loopback on this interface for testing, such as during circuit acceptance testing by a carrier. For example, a carrier performing end-to-end T1 circuit qualification with a customer would need this object enabled at the customer premise equipment so the carrier's remote loop-up test commands are honored.