- PDH multiplexer - 1/2/4/8/16 E1 - 1/2/4 Ethernet - RS485/232, Order Wire ... -T standard. featureOver 30 models of PDH device for wide spread application and suit for customer Bandwidth: N*64K, ... 622M, 1.25G, 2.5G1U device support up to 16*E1, PDH poll support up to 224 E1Services supported: E1 ... *Ethernet PDH with optical 1+1 4 / 8 / 16 E1 PDH Multiplexer, Optical Fiber Multiplexer, Fiber Optic Modem