Compact Designed Fibre Optic Modem provides the user the capability to establish communication between two E1 interfaces or between an E1/FE1 interface and an V.35 interface over an optical fibre link. The Fibre Optic Modem is designed to establish point-to-point fibre link at ranges longer than any copper modem can achieve. The Fibre Optic Modem establishes a secure, long range data fibre link between routers, multiplexers and other E1 devices. Compact Designed Fibre Optic Modem is featured with a clock with three clock mode options like internal, external and slave clock.