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E1/T1 G.SHDSL Two-Wire Extender/NTU  

This extender/NTU suits unbalanced E1/T1 connections—and needs only two wires.


Extended Double Diamond™ Warranty Available (3 Additional Year)

Product Highlights

  • Provides data rates up to 4.6 Mbps over 2-wire, voice-grade wiring.

  • Further Details

  • Selectable 64-kbps rates enable you to choose the bandwidth you need.
  • Supports distances up to 9.9 miles at lower speeds over 19 AWG wiring.
  • Probes voice-grade wiring to determine the optimum data rate supported.
  • Supports G.994.2 handshaking, enabling it to adapt the rate automatically to the existing line conditions.
  • Features an RJ-45 port for managing via a Telnet console connection.
  • Simple to set up and, once configured, operates transparently.
  • Transformer-coupled two-wire interface boasts 2500-VRMS isolation.
  • Works with other extender/NTUs to provide interface conversion along with network termination and extension.

  • Save in cabling costs! A BLACK BOX® E1/T1 G.SHDSL Two-Wire Extender/NTU works as a symmetrical high data rate DSL (G.SHDSL) modem and enables you to use just two wires to extend T1 or E1 communications at higher speeds in a point-to-point application.

    Featuring symmetric high-speed digital subscriber line technology, the G.991.2 standard device delivers rate-adaptive nx64 speeds as high as 4.6 Mbps.

    The extender/NTU works in a pair communicating across dry, two-wire copper cable of any gauge from 19 AWG (0.9 mm) to 26 AWG (0.4 mm). You may even be able to use the telephone wiring already connecting offices or buildings in your application.

    Using the DIP switch on the extender/NTU or a Telnet connection, you can set its rate in 64-kbps increments to provide a precise amount of bandwidth to users and to get either greater speed or greater distance. The extender/NTU uses Trellis Coded Pulse Amplitude Modulation (TCPAM) to enhance its performance and support distances twice as far as conventional TDM technologies—up to 9.9 miles (16 km) when using 19 AWG wiring and operating at 192-kbps speeds.

    The G.SHDSL Two-Wire Extender/NTU also includes a probe to determine the optimum data rate supported by the link between local and remote units. In addition, an error monitor inspects the line for intervals that exceed its user-set error threshold and, if necessary, restarts the link automatically.

    For easy troubleshooting, the extender/NTU features front-panel LEDs and other diagnostic tools for detecting errors on the two-wire connection. The E1/T1 extender/NTU also features a PRBS pattern generator and detector, and supports basic error rate (BER) testing.

    Use the E1/T1 G.SHDSL Two-Wire Extender/NTU to make G.703/G.704 connections. The extender/NTU features two BNC connectors and an RJ-48C jack, so it suits both unbalanced E1/T1 connections. Use this extender/NTU to connect to either a 75-ohm dual coax E1 or T1 network, or to link it to a 120-ohm E1 or 100-ohm T1 twisted-pair network interface. It supports local and remote loopbacks.

    Approvals CE
    Clocking Modes Internal, receive recovered
    Interconnection Cable Required Twisted-pair, unconditioned, dry, metal wire 19 AWG (0.9 mm) to 26 AWG (0.4 mm)
    Data Rates From 64 kbps to 4.6 Mbps in 64-kbps steps
    Distance 26 AWG (0.4-mm) wire: 4 mi. (6.4 km) at 192 kbps; 1 mi. (1.6 km) at 4.6 Mbps;
    24 AWG (0.5-mm) wire: 5.3 mi. (8.5 km) at 192 kbps; 1.3 mi. (2.1 km) at 4.6 Mbps;
    22 AWG (0.6-mm) wire: 6.6 mi. (10.6 km) at 192 kbps; 1.7 mi. (2.7 km) at 4.6 Mbps;
    19 AWG (0.9-mm) wire: 9.9 mi. (15.9 km) at 192 kbps; 2.5 mi. (4 km) at 4.6 Mbps
    Line Coding Trellis Coded Pulse Amplitude Modulation (TCPAM)
    Connectors Interface: (2) BNC F, (1) RJ-48C;
    G.SHDSL: (1) RJ-45 (2-wire polarity insensitive on Pins 4 and 5);
    Telnet console: (1) RJ-45
    Indicators (5) LEDs: Power LED, DSL, TM/ER, LINK, LOSS
    Power Input: 90-260 VAC, 50-60 Hz, autosensing, external
    Dimensions 1.5"H x 5"W x 4.7"D (3.9 x 12.7 x 10.6 cm)

    NOTE: Actual distance and link performance may vary depending on the environment and gauge and type of wire you use.

    This product works with:
  • GigaBase CAT5e 350-MHz Cable (EVNSL80, etc.)
  • T1 Cable (ETNMSR01)
  • Questions? Contact our FREE Tech Support.

    NOTE: Technical specification weight is the unit weight. It is not the packaged shipping weight. For shipping weight, please contact Black Box customer service at 1-800-316-7107.


    • X.21 G.SHDSL Two-Wire Extender/NTU User Manual
      User Manual for the ME231A-R2, ME232A-R2, & ME233A-R2 (Version 1)

    Accessory: ETNMSR01-0005

    T1 Cable, RJ-48C/RJ-48C, 5-ft. (1.5-m)

    T1 Cable, RJ-48C/RJ-48C, 5-ft. (1.5-m)

    Accessory: EVNSL85-0010

    GigaBase 350 CAT5e Patch Cable, Snagless Boots, Beige, 10-ft. (3.0-m)

    GigaBase 350 CAT5e Patch Cable, Snagless Boots, Beige, 10-ft. (3.0-m)

    Double Diamond Warranty
    Extended Double Diamond™ Warranty Available (3 Additional Year)

    Double Diamond™ Warranty (Standard)


    Take the risk out of equipment purchases with the Double Diamond™ Warranty from Black Box Network Services.

    The Double Diamond Warranty is our warranty that protects your Black Box® brand products* from accidental damage, including drops, water, and power surges.

    The E1/T1 G.SHDSL Two-Wire Extender/NTU comes with a standard 1 Year warranty already included.

    During the warranty period, Black Box Network Services will repair or replace your damaged equipment within one week of receipt at NO CHARGE!*

    Plus, get an Extended Double Diamond Warranty.

    You can also extend your warranty or protect a previously purchased Black Box® brand product** for an additional year—for only 10% of the purchase price! Or, extend your coverage for a full three years for only 20% of the purchase price!

    Ordering an extended warranty is easy: When viewing a product in your shopping cart, just select the one or three years of additional coverage in the dropdown menu under “Warranty Options.” For details, contact Customer Service at 724-746-5500.

    * Warranty subject to certain exclusions and limitations
    ** Certain products may not be eligible.

    What’s more, we also have a 45-day return policy. Simply call Customer Service for a Return Authorization (RA) number, return your product in new condition and in the original package, and receive a full refund.

    Product SKU Price Quantity
    X.21 G.SHDSL Two-Wire Extender/NTU ME232A-R2 $477.70
    V.35 G.SHDSL Two-Wire Extender/NTU ME233A-R2 $477.70

    Add to Cart

    Price: $420.15

    On Back Order




    Shipping Info

    Weight: 1.622 lbs.
    HxWxD: 3.75 x 7.6 x 10.3 in.

    What’s more, we also have a 45-day return policy. Simply call Customer Service for a Return Authorization (RA) number, return your product in new condition and in the original package, and receive a full refund.

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