ABSTRACT: This Technical Reference (TR) describes an interface between loop carrier systems and loop testing systems. This interface is
applicable to the testing of single party, multiparty, and coin telephone services provided over loop carrier systems that interface
with local switching systems on an analog basis. The information in this TR will allow manufacturers of loop carrier systems and
manufacturers of loop testing systems to independently design their systems to be compatible with each other and with present loop
TR-TSY-000465 replaced TA-TSY-000465 and TR-363-23331-84-01.