• FOM-20 Fiber Optic Modem, provides a secure, long range data link between computers, routers, multiplexers and other data communication devices. It operates at 16 selectable synchronous or asynchronous data rates from 19.2 kbps to 256 kbps.

• The built-in Ethernet option enables a cost-effective LAN to LAN connectivity with no need for an external bridge.

• FOM-20 converts electrical signals from DTE equipment into optical signals via an infrared light emitting diode or laser diode. At the opposite end of the fiber, the optical signals are converted back into electrical signals in compliance with the appropriate interface.

• The following DTE interfaces are available:
  • V.24/RS-232
  • V.35
  • X.21
  • RS-530
  • V.36 (RS-449)
  • Built-in Ethernet bridge
  • G.703 Co-directional (64 kbps).

• FOM-20 is designed to operate with several grades and sizes of fiber optic cable. Different optical interfaces are available:
  • 850 nm for use with multimode fibers
  • 1300 nm for use with single mode fibers
  • 1300 nm laser diode
  • 1550 nm laser diode.

• Immunity is provided against electrical interference, such as EMI, RFI, spikes and differential ground loops. Protection is provided against sparking and lightning and a secure link is maintained in hazardous or hostile environments.

• Three clocking modes are provided for maximum flexibility: Internal clock, Receive Loopback clock and External DTE clock.

• FOM-20 utilizes a Phase Locked Loop (PLL) circuit to recover jitter-free data and clock from the optical signal.

• V.54 diagnostics are used for 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 ITU V.52 standard, for testing end-to-end connectivity. An ERROR LED flashes whenever a bit error is detected.

• FOM-20 is available as a standalone unit (1U, 1.75" in height). A special hardware ordering option (RM-9) is available for mounting one or two standalone units side-by-side in a 19" rack.

SPECIFICATIONS

• Fiber Optic Modem data rates: 19.2 to 256 kbps
• Async/Sync operation
• Supports various types of single or multimode fiber
• Extended transmission range up to 140 km / 85 miles using laser diode option
• Digital interfaces: V.24/RS-232, V.35, X.21, RS-530, V.36 (RS-449), built-in Ethernet bridge and G.703 Codirectional
• AC and DC versions
• Diagnostic V.54 loops and built-in V.52 BERT
• Available as a card to fit the ASM-MN-214 rack

FOM 20/*/#/+/&
Fiber optic modem

FOM 20R/#/+
Fiber optic modem card for ASM-MN-214

ORDERING

FOM-20/115/FC13/V24
FOM-20/115/FC13/V35
FOM-20/115/FC13L/V24
FOM-20/115/FC15L/V35
FOM-20/115/FC85/V24
FOM-20/115/SC13/530
FOM-20/115/SC13/V35
FOM-20/115/SC13L/V35
FOM-20/115/SC85/V35
FOM-20/115/SM85/V35
FOM-20/115/ST13/530
FOM-20/115/ST13/V24
FOM-20/115/ST13/V35
FOM-20/115/ST13L/V24
FOM-20/115/ST15L/V24
FOM-20/115/ST85/530
FOM-20/115/ST85/703/TB
FOM-20/115/ST85/V24
FOM-20/115/ST85/V35
FOM-20/115/ST85/V36
FOM-20/115/ST85/X21
FOM-20/230/FC13L/V24
FOM-20/230/ST85/530
FOM-20/230/ST85/V35
FOM-20/48/FC13L/V24
FOM-20/48/ST13/G703/RJ
FOM-20/48/ST13/G703/TB
FOM-20/48/ST13/V24
FOM-20/48/ST13/V36
FOM-20/48/ST85/G703/RJ
FOM-20/48/ST85/G703/TB
FOM-20/48/ST85/V36
FOM-20/R/ST85/V36

 
APPLICATION