Hong Telecom Equipment Service LTD

SDH OptiX OSN 7500 II PDH Boards below: The PDH boards include the PDH service interface boards and PDH service processing boards, to transmit/receive and process E1/T1 signals, E3/T3 signals, E4/STM-1 electrical signals, and DDN signals. PQ1 (63xE1 service processing board). PQM (63xE1/T1 service processing board). PQ3 (12xE3/T3 service processing board). DX1 (DDN service accessing and converging board). SPQ4 (4xE4/STM-1 electrical processing board). D12B (32xE1/T1 access board). D12S (32xE1/T1 switching access board). D75S (32xE1 switching access board). D34S (6xE3/T3 switching access board). MU04 (4xE4/STM-1 electrical interface board). DM12 (DDN service interface board). TSB8 (8-channel electrical interface protection switching board). 1 Relationship between the feature code of the PQ1 and the type of interface impedance Board Feature Code Type of Interface Impedance SSN2PQ1A01 A01 75-ohm SSN2PQ1B01 B01 120-ohm 2 Function...