Fiber Optic Isolator/Converter/Modem

Used in pairs, the FOI-4141 (to DCE) and FOI-4411 (to DTE) provide end-to-end conversion, extension and electrical isolation of RS-232 circuits up to a maximum data rate of 1 Mbps. Multimode optics extends the distance to 2km, while singlemode optics extends the distance to 20km.

These units are transparent to all handshaking protocols and accept data and clock signals. A regeneration switch on the FOI-4141 allows users to toggle between synchronous applications that require send timing (ST) and asynchronous or synchronous applications that require terminal timing (TT).

The units support tail circuit and null modem functions for DCE to DCE or DTE to DTE communications. An alternate interface (V.35 or RS-422) may be installed at the opposite end, allowing the user to create a link between two electrically incompatible interfaces without requiring a separate interface converter.

The units can be used in areas of high electrical noise or in and out of RF shielded enclosures. The fiber optic cable is not susceptible to interference caused by impulse noise, crosstalk, or EMI. Patton recommends “T” units for high security applications because they have been TEMPEST tested and approved.

FOI units can be mounted in several redundant powering chassis; rack and wall mount options including Tempest and NEMA alternatives

Features

• Serial Data to Fiber supporting TIA/EIA -232, -423, -694, -723 and MIL-STD-188C

• Supports Data Rates from DC to 1 Mbps

• Multimode extension of up to 1.2 miles (2 km)

• Singlemode extension up to 12.4 miles (20 km)

• Tail circuit and null modem functions for DCE to DCE or DTE to DTE

• Can be paired with other FOI with V.35 or RS-422 interfaces for interface conversion

• Rugged metal enclosures with RFI shielding

Applications

A typical link consists of a FOI-4141 (to DCE) and a FOI-4411 (to DTE) with a duplex fiber cable in between.