Difference in processing OSC bytes when the SCC board is online or offline

The automatic OSC byte pass-through function is set when the SCC board is online but it is also effective when the SCC board is offline. In the receive direction, OSC overheads can be automatically transmitted to the downstream even using this function even if the SCC board is offline.
In the receive direction, the OSC board receives overhead bytes (OSC bytes) and outputs them to the SCC board for parsing. In the transmit direction, the SCC board collects local management information and outputs the information to the OSC board who then transmits the information in the OSC overhead format.

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