FOM-40 fiber optic modem from RAD
FOM-40 is a long-range fiber optic modem that transmits data over up to 100 km (62 miles), and is a secure data link between
computers, routers, multiplexers, and other data communication devices. The RAD FOM-40 operates at twelve selectable
synchronous data rates from 56 kbps to 2048 kbps. The FOM-40 converts electrical signals from the DTE into optical signals
via a laser diode. At the opposite end of the fiber, the optical signals are converted back into electrical signals, in compliance with the
RAD FOM-40 DTE interfaces available are:
G.703 Codirectional (64 kbps)
FOM-40 operates with several grades and sizes of fiber optic cable. Different optical interfaces
850 nm VSCEL for use with multimode fibers
1310 nm laser for use with single mode fibers
1550 nm laser for use with single mode fibers for an extended range of up to 100 km (62 miles).
RAD FOM-40 offers Three clocking modes for maximum flexibility:
internal clock, receive loopback clock and external DTE clock.
FOM-40 Diagnostics include local analog and digital loopbacks, and remote digital loopback. The loopback commands are controlled
either by a manual switch, or via the DTE interface signals. A front panel switch generates an internal pseudo-random test pattern
(511 bits) according to the ITU V.52 standard, for testing end-to-end connectivity. An ERROR LED flashes whenever a bit error is
A card version of FOM-40 is available for installation in RADís ASM-MN-214 rack.
RAD FOM-40 product data sheet (pdf)