Constraints on loopbacks of the TN53NQ2 board

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A loopback on the TN53NQ2 board can apply only to service granularities received from the backplane side. For example, ODU0 granularities received from the backplane side can be looped back, but ODU1 granularities multiplexed from ODU0 granularities cannot be looped back on the TN53NQ2 board.

Other related questions:
Constraints on loopbacks of the TN53ND2 board
A loopback on the TN53ND2 board can apply only to service granularities received from the backplane side. For example, ODU0 granularities received from the backplane side can be looped back, but ODU1 granularities multiplexed from ODU0 granularities cannot be looped back on the TN53ND2 board.

Constraints on loopbacks of the TN53NS2 board
A loopback on the TN53NS2 board can apply only to service granularities received from the backplane side. For example, ODU0 granularities received from the backplane side can be looped back, but ODU1 granularities multiplexed from ODU0 granularities cannot be looped back on the TN53NS2 board.

Whether the TN53NQ2 board supports the WDM-side loopback
The TN53NQ2 board supports the WDM-side loopback only when ODU2 or ODU2e signals are received on the backplane side.

Identifiers TN53NQ201 and TN5M3NQ201 of a TN53NQ2 board
One TN53NQ2 board has two identifiers. TN53NQ201 indicates the pure board without any optical module, while TN5M3NQ201 indicates the complete board equipped with an optical module.

Whether the TN52NS2 board can function as the regeneration board of the TN53NQ2 board
The WDM-side signals of the TN52NQ2, TN53NQ2, TN54NQ2, or TN57NQ2 board can be regenerated using the TN12ND2, TN52ND2, TN53ND2, TN57ND2, TN55NO2, TN55NH2, TN53NQ2, TN54NQ2, or TN57NQ2 board.

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