FIBER-OPTIC TRANSCEIVER

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ADC's Fiber-Optic Transceiver units (referred to as a "FOM," short for Fiber-Optic Modem) interface data terminal equipment ("DTE") to a fiber-optic communications channel. A pair of FOMs provide virtual RS-232 connections between two distant computer devices. A network of FOMs will allow many devices to share a common channel provided the attached instruments are designed for party-line (Master/Slave) communications. The latter is typical of process and supervisory control system applications.

FOMs are situated between the communications port of each DTE device and the fiber cables, and constitute a "node" in a fiber-optic network. The conversion of RS-232 signals to light (and back again) is completely transparently to the attached computers. FOMs also function as repeaters, independently of any attached DTE device. The maximum allowable length of fiber cable between any two FOM nodes is 16,000 feet (5,000 m).

A FOM network provides the same functionality as Bell 103/202 type modems operating over 2/4 wire circuits, and hence FOMs are frequently referred to as "fiber-optic modems." Using light as a transmission medium provides additional benefits including greater distances between nodes and protection from line-borne transients.

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APPLICATIONS

• Industrial system communications
• Process I/O networks
• Short/Long haul modems

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FEATURES

• Inexpensive and easy to install
• Light transmission/conversion completely transparent to connected DTE devices
• Small size and low power consumption
• Far internode distances allowed for widearea systems
• Configurable TxD gain allows output levels to be fine-tuned to particular sites
• High immunity to induced, electromagnetic, and RF interference for safe and reliable communications channel
• Industrial quality components and workmanship for long and reliable operation

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SPECIFICATIONS

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Operating environment (electronics)

• Standard -10 to +70°C temperature
• 0 to 95% relative humidity (non-condensing)

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Operating power

• 10-14VDC input power
  (AC/DC-DC converters/chargers available)
• Typical logic current drain 25mA (-7dB TX setting) to 46mA (0dB TX setting)

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Fiber cable terminations

• 4 connections (for 2 TxD/RxD cable pairs)
• ST or SMA type as specified
• Recommended cable: 62.5µm core/125µm cladding, duplex fiber optic cable

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Communication port (to Master or Slave)

• Data rate (set by connected DTE)
  • RS-232 interface (DE9 female), transparent from DC to 115,200bps
  • RS-422 & RS-485 interface (DE9 female), transparent from DC to 1.5Mbps
• Asynchronous or synchronous communications

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LED indicators

• Unit power
• Cable 1 ("TX Line") data
• Cable 2 ("RX Line") data

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Physical

• Size: 4.5" X 2.3" X 0.6" (114 X 59 X 15mm)
• Standard panel mounting
• Optional plastic enclosure for desktop applications

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ADDITIONAL INFORMATION

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ORDERING INFORMATION

200139: FIBER-OPTIC TRANSCEIVER

This assembly is provided in the following versions (XXX designation of part number).

• -001: Card assembly, ST connectors
• -002: Card assembly, SMA connectors

200139-001 $339

200139-002 $339

OPTIONAL CASE (KIT). Plastic enclosure, panels. Holds 1-2 FOMs
004000-001 $13

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