RLH Industries, Inc.
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RLH2 Wire POTS Fiber Link Cards

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The 2 Wire POTS (Plain Old Telephone Service) system provides transmission of standard analog phone, telemetering, or PBX loop start signals over two optical fibers. The system transmits signals in the voice-frequency or audio range (300Hz~3500Hz) while providing ringing and off-hook detection. Common applications include telephone, faxes, and dial-up modems.

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This fiber link card is NEBS Level III approved, is designed to be installed into any of the RLH Fiber Link Card Housings, and occupies a single card slot.

A complete system uses one CO and one Sub card.

Note: Special modifications are available for forward disconnect (SM07) and square wave ringing (SM10). Contact the factory for additional information.

  • Compatible with all 2 Wire POTS systems
  • CO side is loop powered
  • Available in Single and Multimode
  • Available with ST or SC Connectors
  • Convenient sub card LED status indicators
  • Compatible with a wide variety of Card Housings
  • Limited Lifetime Warranty
  • Made in USA

  • Transmission Method: Frequency modulated light via two optical fibers
  • Wavelength:
    • Multimode: 850nm
    • Singlemode: 1310nm
    • SM Long Haul: 1310nm
  • Fiber Type/Distance:
    • Multimode (62.5/125µm, 50/125µm): 1.5 miles/2.5km
    • Singlemode (9/125µm): 9 miles/15km; Long Haul 37 miles/60km
  • Fiber Connector Type: ST or SC
  • Dimensions: 7in. x 4in. x 1in. (177.8mm x 101.6mm x 25.4mm) (Standard RLH Fiber Link Card Form Factor)
  • Operating Temperature: -40°F to +158°F (-40°C to +70°C)