... traditional PDH multiplexer and 1000Mbps Ethernet optical transceiver, and can realize the 4/8/16 E1s and four ... E1s and four 1000M Ethernet mixed multiplexing to optical fiber Optical interfaceDual optical interfaces, SFP optical module (LC interface), Hot pluggingThe line ... power down or fiber brokenE1 interfaceProvides 4/8/16 E1 interfaces, compliant to G.703, and balanced/unbalanced ...