... circuit ,a point to point ,link circuit ,loop optical transmission equipment . It can supply 4/8/16/24 interfaces , ... to DTE ( data terminal equipment )2.supply order E1 opposite terminal loop back function ,optical home terminal self-loop ... single fiber ,duplex fiber ,optional6.receiving sensitivity : superior to -36dBm7.optical power output : -8 dBm ~-15dBmRS232 interface 1.working pattern : ...