The FOM-1091-C is a member of the FOM-1091 product series. The FOM-1090 and FOM-1091 fiber optic isolatormodem cards provides for full synchronous, asynchronous, or isochronous interfacing to serial data communications equipment. The unit is transparent to all data formats and protocol, and supports timing from the DCE and DTE as well as uncommon clocking styles such as gapped clock or gated clocks that stop in different states to indicate status. The status and direction of all supported signals is shown on front panel indicators in addition to power supply and optical link status for each card.
The user can achieve complete electrical isolation for NRZ data communications in areas of high electrical noise or in/out of RF shielded enclosures (SCIF). The fiber optic cable is not susceptible to induced impulse noise and since signal ground is not carried over the link, the signal is not affected by elevated ground potential from lightning or other sources. The fiber optic cable enhances privacy of communications. While a typical link consists of a FOM-1090 (DCE) at one end and a FOM-1091 (DTE) at the opposite end, a pair of the same units may be used together as when using two FOM-1090 DCE units to create a null modem link. In addition, a different interface may be selected at each end allowing the user to create a fiber link between two electrically incompatible interfaces without requiring a separate interface converter.