• The FOM-8, Synchronous/Asynchronous Short Range Modem, is used for local data distribution, connecting full or half duplex Sync or Async DTEs to other DTEs, over fiber optic cable. FOM-8 operates at data rates up to 19.2 kbps.

• FOM-8 performs diagnostic loops in compliance with ITU V.54 standard. Two V.54 loops are available: analog loop (V.54 Loop 3) and remote digital loop (V.54 Loop 2). The loops are activated by DTE interface signals Circuit 141 (Pin 18) and Circuit 140 (Pin 21).

• Asynchronous transmission is provided by internal conversion from Async to Sync in compliance with ITU V.22 bis standard. Different Async formats are switch selectable.

• In the Synchronous mode, transmit timing is provided by three alternative sources:
  • Internal oscillator
  • External clock
  • Loopback clock derived from the receive signal.

• The modem's carrier can be strapped for either continuous operation, or for switched operation. In switched operation, the carrier is controlled by the RTS signal, and enables transfer of a control signal end-to-end.

• FOM-8 is designed to operate with several grades and sizes of fiber optic cable. Two different optical interfaces are available:
  • 820 nm for use with multimode fibers
  • 1300 nm for use with single mode fibers.

• FOM-8 incorporates all the advantages of a fiber optic system:
  • Lower attenuation than with copper wires; additionally, attenuation is not related to frequency.
  • EMI/RFI immunity, which saves the cost of expensive and heavy shielding and complex error checking devices.
  • Security is almost absolute. The cost of data encryption is reduced. Eavesdropping is virtually useless, as the fibers generate negligible power.
  • Safety and electrical isolation - no spark hazard or ground-loop noise problems.

• Innovative circuitry design allows operation without a power supply, by using ultra-low power from the standard RS-232/V.24 data and control signals. For proper operation, both data and at least one control signal must be connected. i.e. Transmit Data, Receive Data, Signal Ground, and either RTS or DTR.

• FOM-8 is compatible with the CMN-CF8 card of the 19" CMN-16 modem rack.

SPECIFICATIONS

• Synchronous or Asynchronous transmission
• Data rates up to 19.2 kbps
• V.54 diagnostics, including local and remote tests
• Supports transmission over single mode or multimode fiber
• Full or half duplex
• Plugs directly into the RS-232/V.24 connector
• Internal, external, or receive clock
• Ruggedized metal enclosure
• No AC power required
• Miniature, lightweight, easy to install
• Card version for 19" modem rack

FOM-8/*/+/#
Synchronous/Asynchronous Short Range Modem

ORDERING

FOM-8/F/FC/13
FOM-8/F/SMA
FOM-8/F/ST
FOM-8/F/ST/13
FOM-8/M/SMA
FOM-8/M/ST
FOM-8/M/ST/13

 
APPLICATION