Chapter 5. Diagnostics
190
Dual Channel Bank: Normal Operation
In Dual Channel Bank operation, the D/I Mux III acts as two separate channel banks, one looking
to T1-1, and the other looking to T1-2. The Dual CSU Interface routes incoming PCM from span
B to the input of LIU B, and sends PCM from the output of LIU B to the output of span B.
Incoming PCM from span A is sent to the input of LIU A, and PCM from the output of LIU A is
sent to the output of span A. The paths through both LIUs are blocked so information cannot
pass through the system. See detail in Figure 5-18.
Figure 5-18. Dual Channel Bank: Normal Operation
Dual Channel Bank: Bypass
Bypass mode is not allowed in Dual Channel Bank mode.
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