Chapter 5. Diagnostics
189
Drop-and-Insert: T1-2 Payload Loopback
Incoming PCM from span A is sent to the input of LIU A, then from the output of LIU A to
the input of LIU B, and finally from the output of LIU B to the output of span B. PCM from
the output of LIU A is also sent to the output of span A. Reference Figure 5-17.
Figure 5-17. Drop-and-Insert: T1-2 Payload Loopback
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