Extend T3, E3, DS3 Circuits Over Fiber

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  • Critical DS3 environments such as Wireless, Utility and Military applications
  • Full duplex, constant transmission
  • T3 (DS3) or E3 coax fiber converter
  • Framing independent - supports framed or unframed and channelized or fractional unchannelized data
  • Supports B3ZS for T3 (DS3) and HDB3 for E3 codes
  • Features user-selectable Local and Remote Loop-Back modes and Force 1’s (AIS) to Coax and Fiber
  • Individual coax and fiber port enable/disable
  • LED displays for immediate visual status of each port
  • Meets ANSI, ETSI and ITU specifications
  • Compatible with wide variety of housings
  • Limited Lifetime Warranty

  • Made in USA

The RLH DS3 T3/E3 Fiber Link Card converts standard T3 (44.736Mbps) or E3 (34.368Mbps) coax for transmission over fiber optic cable, and can be used by telco service providers and enterprise level users to connect to communication devices such as Utility, Wireless, PBX, Multiplexers, Routers and video servers via fiber optic cable.

The T3/E3 Fiber Link Card operates in pairs, extending distances over fiber and improving noise immunity and quality of service while improving intrusion protection, and providing high voltage communications protection and network security.

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: 1310nm
Singlemode/Long Haul: 1310nm

Fiber Type/Distance:
Multimode (62.5/125µm): 3 miles/5km
Singlemode (9/125µm): 18 miles/30km
Long Haul (9/125µm): 37 miles/60km

COAX Type/Distance:
RG-59 75Ohm short-haul: 225ft/68.5m
RG-59 75Ohm long-haul (T3): 1245ft/380m
RG-59 75Ohm long-haul (E3): 1445ft/440m

Fiber Connector Type:

ANSI: T1.102, T1.107, T1.403, T1.404, T1-404a (T3), T1-408
ITU: G.703 (E3), G.704, G.706, G.751, G.921, G.926, O.151
ETSI: EN 300 689, 300 686, 300 687

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 +140˚F (-40˚C to +60˚C)

Operating Humidity:
95% non-condensing

DS3 (T3/E3)

DS3 (T3/E3) System

DS3 (T3/E3)

DS3 (T3/E3) Application


Download the RLH Data Sheet

Download the RLH User Guide

Download the Layout

Download the RLH DXF File

Download the DXF File

  • A complete system requires 2 cards
  • 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.