Neptune M28876 Ethernet Media Converters

Neptune Ethernet Media Converter

Moog Protokraft Neptune series fiber optic Ethernet media converters consist of optoelectronic transmitter and receiver functions integrated along with the 10/100Base-TX to 100Base-FX or 1000Base-T Ethernet electrical to 1000Base-LX or 1000Base-SX Ethernet optical media conversion circuitry into an environmentally sealed unit.

The optical transmitters are high performance 1310 nm FP Lasers, LEDs or 850 nm VCSELs. The optical receivers consist of GaAs or InGaAs PIN and preamplifier assemblies and limiting post-amplifiers. The optical interface to the Neptune series optical media converters is a MIL-DTL-28876 fiber optic connector enabling interconnection to preterminated M28876 optical fiber cable assemblies. The electrical interface to the Neptune series optical media converters is a MIL-STD-83513 Micro D-Subminiature connector enabling connection to a customer supplied cable assembly.


  • Compliant with IEEE-802.3:2005 Fast or Gigabit Ethernet
  • Optical fiber link distances up to 10 km
  • Maximum optical channel bit error rate less than 1x10-12
  • Operating temperature range from -40°C to +85°C
  • Shock, vibration and ESD resistant per MIL-STD-810
  • Olive drab cadmium or nickel plating meets stringent EMI / RFI performance specifications
  • Aluminum alloy case and connectors are strong, durable, corrosion resistant and lightweight
  • M28876 compliant optical fiber connector interface
  • MIL-DTL-83513 electrical interface provides robust interconnection to system wiring
  • Sealed against liquid and solid contaminants
  • 28 VDC (16.36 VDC) power supply

Note: Other wavelength, mounting and port count options are available.

Typical Applications

Neptune series Fast and Gigabit Ethernet media converters enable high speed network communications over long distances in harsh environments.

  • Network switch / router rack-to-rack links
  • Storage or computation clusters
  • Naval Ethernet media converter