FME Series Fiber Modem can modulate G.703 E1 signal or V.35 signal to single-mode or multimode fiber which extend the transmitting distance of E1 signal greatly.E1 signal support framed and unframed mode.When in framed mode,continuous or discontinuous time-slot can be selected,E1 fiber modem and V.35 fiber modem can be used together.Both of them are widely used in extending uesr interface in ATM or DDN