This chapter describes the PDH boards that the OptiX OSN 550 supports.
6.1 SP3D
The SP3D is a 42xE1/T1 electrical interface board.
6.2 PL3T
The PL3T is a 3xE3/T3 electrical interface board.
6.3 TPS
Two PD1 boards and one DMS board work together to provide tributary protection switching
(TPS).
6.4 PD1
The PD1 is a 32xE1/T1 tributary service processing board.
6.5 DMS
The DMS is a 32xE1/T1 electrical interface board.