Position of the DCM module on an NE

If only one OBU board is configured on the NE, the DCM/DCU must be placed between a VOA and the OBU on the line.
If only one OAU board is configured on the NE, the DCM/DCU must be placed between the TDC and RDC ports of the OAU board on the line.
If OAU+OBU or OPU+OBU are configured on the NE, the DCM/DCU must be placed between the two OA boards.

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