Different solutions for external 2M clocks of OSN 8800 and OSN 6800 devices

In OSN 8800, clock signals and frame headers do not need to pass the cross-connect board but the status signals are bound. In addition, the STG board of OSN 8800 must work with the cross-connect board. In OSN 6800, clock signals and frame headers do not need to pass the cross-connect board. Active/standby switching is implemented for cross-connect boards and STG boards in an associated way.

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