T1/E1 Loopback Operation for Maxim T1/E1/J1 Transceivers

Abstract: This application note contains an overview of the loopback functions for Maxim T1/E1/J1 transceivers. Loopback modes are useful for diagnostic testing of the device or equipment. In loopback mode, the device loops the signal from one end of the device to the other end of the sending device after it has passed through a network or across a particular link. The signals from both ends can be compared. The discrepancy between the two helps to trace the fault.