Reason why TOA boards support channel loopbacks only in ODU1_ODU0 mode

When the TOA board works in a mode rather than the ODU1_ODU0 mode, the service mapping path is ANY->ODU0 or ANY->ODU1. Similar to other line boards in this scenario, the TOA board supports only one channel of ODUk signals and does not support ODUk channel loopbacks. When the TOA board works in ODU1_ODU0 mode, the service mapping path is OTU1->ODU1->ODU0 (two channels of ODUk signals are supported). In this scenario, a channel loopback can be performed for the two channels of ODUk signals.

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