Extend 56Kbps Frame Relay Circuits Over Fiber – Line Powered

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  • 9.2 Kbps to 64 Kbps data rate
  • 4 Wire Frame Relay 64 Kbps DDS
  • Adtran® Total Reach® and Westell® compatible
  • Environmentally hardened, superior operating temperature range
  • 1 kHz to 300 kHz bandwidth
  • Dual power capable, line or 24-56VDC
  • Available in Single or Multi-mode
  • Available with ST or SC Connectors
  • Compatible with wide variety of housings
  • Available pre-installed in housings
  • NEBS Level III approved
  • Limited Lifetime Warranty

  • Made in USA

NEBS Level 3

The 4 Wire 56k DDS fiber link card processes incoming bipolar signals within a bandwidth of 1 kHz to 300 kHz at a data rate range of 19.2 Kbps to 64 Kbps. This is an excellent fit for 56Kbps systems, and compatible down to 19.2Kbps.

This fiber link card is designed to be installed into any of the RLH fiber link card housings, and occupies a single card slot.


For a comprehensive review of the product specs, please see the Data Sheet, or feel free to contact us with any questions.

Transmission Method:
Frequency modulated light via two optical fibers

Multimode: 850nm
Singlemode: 1310nm

Fiber Type/Distance:
Multimode (62.5/125µm): 1.2 miles/2km
Singlemode (9/125µm): 9 miles/15km; Long Haul 31 miles/50km

Fiber Connector Type:
ST or SC

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)

Operating Humidity:
95% non-condensing

4 Wire 56Kbps DDS Application

4 Wire 56Kbps DDS Application

The RLH Frame Relay 64 Kbps Sub card will pass sealing current to power the Westell® 56Kbps DDI 5740l3 200 Mechanics Remote Module/NIU. The Part# is DDI5740I3, CLEI# NCC1MFN4AA, Description: Digital Data Interface Module with Line Powering.

The Fiber Optic Link Frame Relay 64 Kbps system is compatible with the Adtran® Total Reach® 2-wire system, by using the Adtran remote unit part new part number: 1292023L5 CLEI# D4OIKXU8AA . The obsolete part number is 1292021L5. The List 5 remote unit will pass through sealing current to power the Fiber Optic Link Frame Relay CO Card. The Sealing Current Switch on the CO Card must be in the OFF position.

4 Wire 56Kbps DDS Application

4 Wire 56Kbps DDS Application


Download the RLH Data Sheet

Download the RLH User Guide

Download Layout

Download Layout

Download the DXF File

Download the DXF File

Download the DWG File

Download the DWG File

  • A complete system requires a CO card and a SUB card
  • This card is designed to be installed into a Card Housing

Please submit a quote request or contact your RLH sales representative for pricing and delivery information.