Chapter 5. Diagnostics
193
Dual Channel Bank: T1-1 and T1-2 Line Loopback
Line Loop Set code received on span B input causes PCM to be looped back out span A's
output before reaching the LIUs, as well as being passed on to the input of LIU B. The
PCM from the output of LIU B is blocked. Line Loop Set code received on span A input
causes PCM to be looped back out span B's output before the LIUs, as well as being
passed on to the input of LIU A. The PCM from the output of the LIU A is blocked. See
Figure 5-21 for details.
Figure 5-21. Dual Channel Bank: T1-1 and T1-2 Line Loopback
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