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1000 Base-T Ethernet

Model #: FOI-1GBT


The FOI-1GBT provides complete electrical isolation for 1000BASE-T Gigabit Ethernet communications. The unit has an automatic MDI/MDIX switch over capability that allow users to use either a straight or crossover cable for all LAN configurations. The copper interface is fully automatic. If TP+ and TP- are reversed, the unit will automatically swap the polarity internally. Similarly, if the transmit and receive pairs are reversed, the unit will automatically swap both pairs internally. Therefore, either a crossover or straight cable can be used.

The unit 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. Privacy of communications is also enhanced because the fiber optic cable does not radiate any emissions. In addition, fiber optic cable offers much longer transmission distances than copper wiring. Traditional 1000BASE-T Cat5e cabling is limited to a maximum distance of 100m, but multimode optics on the unit can extend the distance to 550m, while singlemode optics can further extend the distance to 5km.A typical link consists of two FOI-1GBT, one at each end of the network, with a duplex fiber optic cable between them.

Flexible Mounting and Powering Options

The FOI-1GBT is part of the FOI line of products designed for ruggedized mil applications. It is housed in the familiar FOI shielded can enclosure. For standalone applications it can be powered by adding a PSQ‐4909 AC supply or a PSQ‐4920 DC power supply (not included). Optionally, up to 8 FOI units can be mounted on CMA chassis adapters and installed in an RMC‐3101 or RMC‐2101 rack mount chassis. The units are powered redundantly by a common back plane connection.

  • 1000BASE-T Ethernet to Fiber Converter
  • Compliant with: IEEE 802.3ab
  • Optically compatible with Ethernet optical standards
Power Requirement Voltage Range (V)
Supply Current (mA)
Data rate 100 Mbps
Line Encoding PAM5 (Pulse Amplitude Modulation 5)
Environmental Storage Temperature (°C)
OperatingTemperature (°C)
Interface Connector RJ-45
Case Dimensions Size 4
4.5 in (114 mm)
1.453 in (37 mm)
2.562 in (65 mm)
2 lb (0.9 kg)
Max Distance
Output Power
RX Sens Loss Budget
62.5 / 125 μm
2 km (10Base) 300m (100Base)
820 nm
-18 dBm
-30 dBm 12 dB
Singlemode 9 /125 μm 20 km 1300 nm -15 dBm -32 dBm 17 dB
PDF Document Datasheet
PSQ-4909 Power Supply for size 4 FOI type isolator stand-alone configuration
WMA-3002 Wall mount adapter for FOI type isolators
RMC-3101 19" Rack mount chassis, 5 1/4" (3U)  for FOI type isolators
CMA-3002 Chassis Mounting Adapter for FOI type isolator
Standalone Operation  
PSQ-4909  Standalone AC Power Supply
PSQ-4920 Standalone DC Power Supply
WMA-3002 Wall Mount Adapter
WMA-2001 Wall Mount Adapter with ST Optical Patch
Chassis Mounting  
RMC-2101 2U, 19" Rack Mount Chassis. Holds up to 9 FOI Modules
CMA-2001 Chassis Mount Adapter for RMC-2101 Chassis. (1) per FOI Module required
PSM-2010 Spare Power Supply for RMC-2101
RP2 16 Channel Modular Bolt-On Connector Panel for RMC-2101
RMC-3101 3U, 19" Rack Mount Chassis. Holds up to 9 FOI Modules
CMA-3002 Chassis Mount Adapter for RMC-3101 Chassis. (1) per FOI Module required
PSM-3010 Spare Power Supply for RMC-3101
Industrial Solutions
RMC-3700  Environmental Enclosure for FOI Modules
CMA-3002 Chassis Mount Adapter for RMC-3101 Chassis. (1) per FOI Module required
PSM-3010 Spare Power Supply for RMC-3101

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