Coastcom D/I Mux III System User Manual

Chapter 5. Diagnostics
194
Dual 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; line loopback does not include the LIUs. In payload loopback,
the loopback occurs after rather than before the LIUs.
Dual Channel Bank: T1-1 Payload Loopback
PCM from span B (T1-1) is sent to the input of LIU B. The output of LIU B is looped to the
input of LIU A. The output of LIU A is sent out on span A (T1-1). The input from span A
(T1-2) is blocked, as is the output path to span B (T1-2). In other words, the T1-2 side of
the D/I Mux III is now disconnected from the network. The LIUs are configured to allow
data input on span B (T1-1) to be output on span A (T1-1). The data input on span B (T1-
1) will be dropped to both T1-1 and T1-2 line cards. See detail in Figure 5-22.
Figure 5-22. Dual Channel Bank: T1-1 Payload Loopback

Coastcom D/I Mux III System Specifications

General

Brand	Coastcom
Model	D/I Mux III System
Category	Multiplexer
Language	English