- PDH multiplexer - 1/2/4/8/16 E1 - 1/2/4 Ethernet - RS485/232, Order Wire - Factory Price, 3 year warranty, 7X24 ... .5G1U device support up to 16*E1, PDH poll support up to 224 E1Services supported: E1, Ethernet, FXS, FXO, V.35, V.24 ... optical 1+1 FOM-16E1-nED16*E1+1*Ethernet PDH with optical 1+1 4 / 8 / 16 E1 PDH Multiplexer, Optical Fiber Multiplexer, Fiber ...