Board Description Board Description N1PQ1, N2PQ1 63xE1 service processing board N2PQ3 12xE3/T3 service processing board N1PQM 63xE1/T1 service processing board N1DX1 DDN service accessing and converging board N1PL3, N2PL3 3xE3/T3 service processing board N1DXA DDN service converging and processing board N1PL3A, N2PL3A 3xE3/T3 service processing board (The interfaces are available on the front panel.) N1SPQ4, N2SPQ4 4xE4/STM-1 electrical processing board N1PD3, N2PD3 6xE3/T3 service processing board N1MU04 4xE4/STM-1 electrical interface board N1D75S 32xE1 switching access board (75 ohms) N1D34S 6xE3/T3 switching access board N1C34S 3xE3/T3 switching access board N1D12S 32xE1/T1 switching access board (120 ohms) N1D12B 32xE1/T1 access board (120 ohms) N1DM12 DDN service interface board N1TSB4 4-channel electrical interface protection switching board N1TSB8 8-channel electrical interface protection switching board ATM boards that the OptiX OSN3500 supports Board Description Board Description N1ADQ1 4xSTM-1 ATM service processing board N1ADL4 1xSTM-4 ATM service processing board N1IDQ1, N1IDQ1A 4xSTM-1 ATM service processing board N1IDL4, N1IDL4A 1xSTM-4 ATM service processing
