• The FOM-5A and FOM-6A, Asynchronous Fiber Optic Modems, are used for local data distribution connecting full or half duplex async computers and terminals. A pair of modems ensures integrity of data transmission over fiber optic cable at distances up to 3 km (2 miles).

• FOM-5A is a miniature version of FOM-6A. Both modems are fully compatible and offer the same features. FOM-5A is 78 mm (3.1 in) by 18 mm (0.7 in); FOM-6A is 110 mm (4.3 in) by 24 mm (0.9 in).

• FOM-5A and 6A feature a switch-selectable DTE/DCE option. This allows operation as DTE, for connection to another DCE such as a multiplexer port, eliminating the need for a cross cable. The carrier can be strapped for either continuous operation, or for switched operation controlled by the RTS signal, for transfer of a control signal end-to-end. A LED indicator lights whenever data transmission takes place.

• The delay between Request to Send and Clear to Send can be set for 2 or 15 msec.

• Innovative circuitry allows FOM-5A and 6A to operate without connection to the mains supply, by using ultra low power from the data and control signals.

• Both modems are provided in a plastic enclosure. FOM-6A can optionally be supplied in a metal case to reduce radiated emission (see Ordering).

Note: With FOM-6A in a metal case, the LED indicator is not available.

• FOM-5A and 6A incorporate all the advantages of a fiber optic system, providing:
  • Lower attenuation than with copper wire;
  • EMI/RFI immunity, saving the cost of expensive and heavy shielding, and complex error checking routines;
  • Almost absolute security and reduction in the cost of data encryption; eavesdropping is virtually impossible as negligible power is radiated from the fiber;
  • Safety and electrical isolation: no spark hazard and no ground-loop noise problems.

Note: Attenuation is not related to frequency.

SPECIFICATIONS

• Asynchronous transmission up to 19.2 kbps
• Transmission range up to 3 km (2 miles), regardless of data rate
• Full of half duplex
• Transfers one control signal end-to-end
• DCE-DTE switch
• No external power required
• Plugs directly into V.24/RS-232-C terminal connector
• LED indicator for transmit data
• Compact, lightweight, easy to install

FOM-5A/*/+
Asynchronous Fiber Optic Modem, Sub-miniature

FOM-6A/*/+/#
Asynchronous Fiber Optic Modem, Miniature

ORDERING

FOM-5A/F/FC
FOM-5A/F/SC
FOM-5A/F/SMA
FOM-5A/F/ST
FOM-5A/M/SMA
FOM-5A/M/ST
FOM-5S/F/SMA
FOM-5S/F/ST
FOM-5S/M/SMA
FOM-5S/M/ST
FOM-6A/F
FOM-6A/F/FC
FOM-6A/F/SC
FOM-6A/F/ST
FOM-6A/F/ST/38.4
FOM-6A/F/W
FOM-6A/F/W/ST
FOM-6A/M
FOM-6A/M/SC
FOM-6A/M/ST
FOM-6A/M/ST/38.4
FOM-6A/M/W
FOM-6A/M/W/ST
FOM-6AV/F/FC
FOM-6AV/F/FC13
FOM-6AV/F/ST13
FOM-6AV/F/ST85
FOM-6AV/M/ST13
FOM-6AV/M/ST85

 
APPLICATION