Chapter 5. Diagnostics
195
Dual Channel Bank: T1-2 Payload Loopback
PCM from span A (T1-2) is sent to the input of LIU A. The output of LIU A is looped to the
input of LIU B. The output of LIU B is sent out on span B (T1-2). The input from span B
(T1-1) is blocked, as is the output path to span A (T1-1). In other words, the T1-1 side of
the D/I Mux III is now disconnected from the network. The LIUs are configured to allow
data input on span A (T1-2) to be output on span B (T1-2). The data input on span A (T1-
2) will be dropped to both T1-1 and T1-2 line cards. See Figure 5-23 for details.
Figure 5-23. Dual Channel Bank: T1-2 Payload Loopback
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