Front: FC4200 STM-1/OC-3 BNC-Fibre Converter
Rear: FC4200 STM-1/OC-3 BNC-Fibre Converter

STM-1/OC-3 to Fibre Converter

The FC4200 enables legacy OC-3/STM-1 electrical equipment to be connected to modern STM-1/OC-3 fibre equipment.

STM-1/OC-3 to Singlemode Long Haul Fibre Converter

  • 155Mbps fibre to BNC converter
  • Connects legacy OC-3/STM-1 electrical equipment to modern fibre equipment
  • Transparent clear channel operation for unframed or framed signals
  • Choice of multimode and singlemode fibre interfaces
  • Easy to install & maintain
  • Integral auto-sensing power supply (100-250V AC or -40V DC versions)
  • 12-24V DC power supply available on request
  • External alarm relay port
  • Compact modem style unit, built to European standards
  • Rack mounting kits for 2 or 18 units available

Legacy STM-1/OC-3 155Mbps equipment is often fitted with G.703 BNC electrical interfaces. The FC4X00 product family enables connection of this equipment across fibre.

The FC4X00 product family also enables connection of STM-1/OC-3 BNC electrical equipment to STM-1/OC-3 fibre equipment.

There are three models in the range:

  • FC4000: 155Mbps STM-1/OC-3 G.703 BNC electrical to multimode fibre converter
  • FC4100: 155Mbps STM-1/OC-3 G.703 BNC electrical to 30km singlemode fibre converter
  • FC4200: 155Mbps STM-1/OC-3 G.703 BNC electrical to 70km singlemode fibre converter

Using fibre optics the FC4200 extends the operating distance for a 155Mbps electrical signal to 70km using singlemode fibre. Despite these quoted maximum operating distances for the FC4X00 products, specific installations may only operate over lower distances due to the variations in losses of different types of fibre cable, the use of connecting fibre cables, or patch panels. When operating over 50% of the maximum distances it is advisable to calculate all fibre optic connector and cable losses and compare these with the fibre optic loss budget specified for this product.

The FC4X00 products are totally transparent to both payload and protocol, and as such will convert whatever information at 155Mbps is received from one fibre mode to the other. It requires minimal configuration and has a single LED for status.

The standard FC4X00 is supplied with SC fibre connectors and operates at a nominal wavelength of 1300nm. Other wavelengths are available on request, e.g. 850nm, 1550nm, 1550/1300 WDM. Other connector options are also available on request, e.g. ST, FC.

The FC4X00 has integral mains or 40 volt power supply, and can be desktop or rack-mounted. The FC4X00 range can easily be rack mounted in either a 1U two unit rack mount kit, a 6U eighteen unit rack mount kit.

The FC4X00 is also available in a card based format for use with the 4U 12-slot MetroCONNECT managed chassis.

The FC4X00 is part of a range of fibre conversion products from Metrodata. The wider product range offers fibre conversion solutions ranging from 2Mbps up to 155Mbps for electrical to fibre conversion, or 155Mbps, 622Mbps or Gigabit Ethernet for fibre mode or wavelength conversion.

FC4200: 155Mbps STM-1/OC-3 Electrical BNC to Long Haul Singlemode Fibre Converter
Interfacing between a switch with 155Mbps STM-1/OC-3 electrical BNC connectivity and a long haul singlemode STM-1/OC-3 leased line service

This application shows how an FC4200 unit can be used to interface between a legacy switch with 155Mbps STM-1/OC-3 electrical BNC ports and a standard STM-1/OC-3 leased line circuit delivered over long haul singlemode fibre. In this way historic Telecom switches with 155Mbps STM-1/OC-3 electrical BNC interfaces can be re-used in modern fibre based infrastructures, reducing costs and gaining benefits from the features of both legacy and modern equipment. This singlemode fibre could be across a city, or between cities (e.g. over a rented fibre).

STM-1 Electrical Interface
Port G.703
Interface Dual BNC (75ohm)
Line Coding CMI
Bit Rate 155 Mbps +/- 15ppm
Barrier Fully barriers per EN41003
Cable Lengths RG59 = 70m, UR202 = 80m
Singlemode Long Haul Fiber Interface
Port G.957
Interface Dual SC singlemode 8/125um
Wavelength 1300nm
Bit Rate 155 Mbps +/- 15ppm
Tx Power 0 to -5 dBm
Max Rx Power -8 dBm (may need an attenuator)
Rx Sensitivity -8 to -34 dBm
Optical loss budget -5 - (-34) = 29 dB
Compliance & Approvals
Safety EN60950
Temperature 0-45 deg C
Humidity 0-95% RH, non condensing
Pressure 86-106 kPa
Power Supply Options
-48 VDC -40 to -72 DC, 200-100 mA
AC Mains 100-250 VAC, 50-400 Hz, 65-25 mA IEC connector
Power Consumption 4.5 watts approx when operating
Type Modem, 1U high without feet, IP30C
Dimensions W x D x H (mm)
Rack mount 202 x 132 x 44 (without feet)
Tabletop 202 x 132 x 48 (with feet)
Part Number
Product AC Mains DC Power
FC4200 Singlemode longhaul to STM-1/OC-380-05-917
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2 Unit Rack mount Kit80-05-256
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18 Unit Rack mount Kit80-05-250
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MetroCONNECT FC4200 Module80-16-917
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Product variants with 12V to 24V DC operation are also available on request.

Product Downloads


Further Information

Related Products

Fibre Converters
  • E1/T1 G703 BNC/RJ45 equipment, e.g. routers or PBXs - FC1X00
  • Multimode Fibre interfaces at 155Mbit/s, e.g. routers - FC2X00: MM to SM SH/LH Fibre Mode Converter (100baseF, 155Mbps)
  • E3/DS3 G.703 equipment, e.g. routers or broadcast video equipment - FC3X00
  • STM-1/OC-3 BNC G703 equipment, e.g. core switches - FC4X00
  • Multimode Fibre interfaces at 622Mbit/s, e.g. routers - FC6X00
  • RS232, e.g. terminals - FIMO-232
  • V.35, V.36, X.21, e.g. routers or video conferencing equipment - FIMO2100
  • 1000BaseSX to 1000BaseLX Gigabit Ethernet Converter - FC-GigE
  • Simple method of delivering 4, 8 or 16 E1 services over redundant fibre - EMUX
  • Multiple Ethernet, E1 and T1 equipment - MetroLAN1000
  • Multiple Ethernet, E1, T1, E3 and DS3 equipment - MetroLAN2000
OC-3 Converters
STM-1 Converters

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