Channel Bank: Payload Loopback - Coastcom D/I Mux III System User Manual

Chapter 5. Diagnostics

Channel Bank: Payload Loopback

Payload loopback is initiated from the D/I Mux III software interface. In payload loopback, the
LIUs are included in the data path.
Incoming PCM from span B is sent to the input of LIU B, then from the output of LIU B to the input
of LIU A, and finally from the output of LIU A to the output of span A, as depicted in Figure 5-10.
PCM from the output of LIU B is blocked.
Figure 5-10. Channel Bank: Payload Loopback
182