Cause why TOA provides 16 ClientLP ports but supports only 8 ODU0 services in ODU0 non-convergence mode

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It is normal. The 32 ClientLP ports on the client side of a TOA board are mainly used when the TOA board is interconnected with a TOM board. If the first logical port of the TOM board uses channel 1, its second logical port can use only channel 2. When the TOA board is interconnected with the TOM board, the two boards must use the same channel. For example, if the TOM board uses channel 2, the TOA board must also use channel 2; otherwise, services will become abnormal. Therefore, two channels are designed for the TOA board in ODU0 non-convergence mode.

Other related questions:
Cause why THA provides 32 ClientLP ports but supports only 16 ODU0 services in ODU0 non-convergence mode
It is normal. The 32 ClientLP ports on the client side of a THA board are mainly used when the THA board is interconnected with a TOM board. If the first logical port of the TOM board uses channel 1, its second logical port can use only channel 2. When the THA board is interconnected with the TOM board, the two boards must use the same channel. For example, if the TOM board uses channel 2, the THA board must also use channel 2; otherwise, services will become abnormal. Therefore, two channels are designed for the THA board in ODU0 non-convergence mode.

Working mode of the TOA board when ODU0 services are configured on the board
When ODU0 services are configured, the working mode of the TOA board must be set to ODU0 non-convergence mode (Any -> ODU0).

Difference between the random and consecutive modes for configuring ODU timeslots when the LOA board works in ODU0 non-convergence mode
If the ODU timeslot configuration mode is set to Assign random, the board supports Any->ODU0->ODU2->OTU2. If the ODU timeslot configuration mode is set to Assign consecutive, the board supports Any->ODU0->ODU1->ODU2->OTU2. The difference between the two modes lies in whether the ODU1 chip is involved in mapping processing for intra-board cross-connections.

Whether one ODU0 service can be configured on the TN53ND2 board after two ODU0 services are deleted
1. If the ODU timeslot configuration mode is set to Assign random on the TN53ND2 board, one ODU1 service can be configured after two ODU0 services are deleted, which must be made on the TN53ND2 boards at both ends. Otherwise, services parsing fails, making services become unavailable. 2. If the ODU timeslot configuration mode is set to Assign consecutive on the TN53ND2 board, one ODU1 service cannot be configured after deleting two ODU0 services because there are mappings between ODU0 and ODU1 services.

Whether the HUNQ2 board of OSN 1800 supports the ODU0 cross-connections
The HUNQ2 board supports ODU0 cross-connections, and can cooperate with cross-connect boards to implement grooming for 32 x ODU0 services.

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