E-1, E1 Repeater, E-Extender

A simple E1 Repeater for customer owned cable

  • E-1 4-wire repeater
  • Extends in-house E-1 lines
  • Up to 4000 feet between units
  • RJ-45 or screw down connectors
  • Simple connection to a 4-wire line
  • Inexpensive solution to long cable runs
  • 120/240 VAC, 12/24/48, or 125 VDC powered
  • 1U high rack mountable; 1,2, or 3 x19" rack
  • 20 slot chassis option

Additional RJ-45 Adapter



Download the Manual (PDF version)


How to order


The DCB E-Extender is a 4-wire repeaters for use on customer owned lines or to extend telephone company demarcs. The Extenders are used to extend in-house E-1 lines in campus and high-rise environments.

Note: This product is NOT intended for 10BaseT or Ethernet. E1 modulation is designed for use with twisted pair solid wire phone cables. The E-extender does NOT extend ethernet connections... only E1 connections.

Each pair of E-1 Extenders may be located up to 4000 feet apart. The Extender circuitry is rated to -43 dB dynamic range at the E-1 rate of 2.048 Mbps. As implemented, the parts are slightly de-rated to provide long life at extended temperature range. Therefore the distances specified in this document are only 4000 feet. Solid copper 22 or 24 AWG, two twisted pair is the preferred cable for connection between the Extenders. Connection to the Extender is made through RJ-45 modular connectors or 4-wire screw down barrier strips. Each Extender comes standard with two screw down barrier strips and one RJ-45 connector. If only RJ-45 connections are desired, extra RJ-45 adapters (part number 9502122) may be ordered.

The 120/240 VAC E-Extenders are powered by a small wall-mount transformer. The Extenders are designed for connections between E-1 equipment such as PBXs, E-1 multiplexers, E-1 line drivers, CSUs, routers or any other E-1 equipment requiring long customer owned cable runs. E-Extenders may be used to connect this equipment across a campus, between floors of a high-rise office building or between office buildings with underground cable runs. The E-Extenders are transparent to the type of data sent over the E-1 link. The data can be D-4 format, ESF, PRI, G.703, G.704, etc.

The Extenders are most often used in pairs to extend a telephone company demarc. For example, if a CSU or DSU is limited to 655 feet and is connecting to a phone company smart jack demarc which is limited to 655 feet, the E-Extenders are used in pairs to extend that distance up to 5000 feet.

E-1 repeater
Extends E-1 bi-polar signal
Up to 4000 feet between E-Extenders
Two twisted pair solid copper 22 or 24 AWG
Other types will affect operational distance
Front panel power LED

RJ-45 modular 8-conductor connectors
Pin 1 = Receive
Pin 2 = Receive
Pin 4 = Transmit
Pin 5 = Transmit

4-Wire barrier strip
Pin 1 = Receive
Pin 2 = Receive
Pin 3 = Transmit
Pin 4 = Transmit

Connect the transmit pair of one Extender to the receive pair of the other Extender. Pairs are not polarity sensitive Units supplied with 2 screw down connectors, 1 RJ-45 connector
A cable cross-over is required between two Extenders if using straight RJ-45 cables. This cable connects the receive pair to one Extender to the transmit pair of the other Extender.



Questions? Phone us toll free at 800-432-2638

One RJ-45 connector and two screw terminal connectors are included with each E-Extender.
Item Number Description Price Buy Now!
E-Extender E-1 Line repeater for up to 1200 meters w/ 120VAC power input $ 650 Qty:
E-Extender/12VDC E-1 Line repeater for up to 1200 meters w/ 9-18 VDC power input $ 725 Qty:
E-Extender/24VDC E-1 Line repeater for up to 1200 meters w/ 19-36 VDC power input $ 725 Qty:
E-Extender/48VDC E-1 Line repeater for up to 1200 meters w/ 38-72 VDC power input $ 725 Qty:
9501030 External 125 VDC power supply for standard E-Extender $ 125 Qty:
9500095 Customer's E-Extender to telephone company demarc straight-through RJ45 cable $ 12 Qty:
9500099 Customer equipment to customer equipment E-1 RJ45 crossover cable $ 12 Qty:
9502122 Additional RJ adapter $ 12 Qty:
5003011 Additional screw terminal adapter $ 12 Qty:
E1-KIT E-1 installation accessory kit $ 49 Qty:
9500106 E-1 loopback plug, RJ-45/48C $ 5 Qty:
9902095 19" rack shelf for 1 to 3 E-extenders $ 75 Qty:
L-1 20 slot 19" rack chasis $ 1,680 Qty:

Data Comm for Business Inc.
2949 County Road 1000 E
Dewey, Il 61840
Voice: 217-897-6600
Toll Free: 800-4-DCB-NET
Toll Free: 800-432-2638
Email: Contact Page
Web: www.dcbnet.com
Fax: 217-897-8023
All DCB web pages copyright ©1995- Data Comm for Business, All rights reserved.
EtherPath®, EtherSeries®, EtherPoll®, EtherBridge® and EtherModem® are Registered Trademarks of Data Comm for Business, Inc.