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Async/Sync RS232 Extender over CATx - DB25 Female to RJ-11/RJ-45/Terminal Block

Extend async or sync RS-232 data beyond the 50 ft limitation over CATx at data rates up to 38.4 kbps and reach distances up to 12 miles.

Item #:  Async/Sync RS232 Extender over CATx - DB25 Female to RJ-11/RJ-45/Terminal Block


Call 877-877-2269 for pricing and to place order.
Please Note: Once ordered, this product cannot be cancelled or returned for credit.
Call for Pricing
*Price excludes GST

Product Features

  • Synchronous or asynchronous operation
  • Supports data rates up to 38.4 kbps
  • Two-wire/half duplex or four-wire/full or half duplex
  • V.52 and V.54 test modes
  • Internal, external, or receive loopback clocking in sync mode.
  • Supports RJ-45, RJ-11, and terminal block connections.
  • Interface powered by data and handshake signals no AC power required


  • Nonpowered, so you can install it where it's most convenient.
  • Supports RJ-45, RJ-11, and terminal block connections.
  • Internal, external, or receive loopback clocking in sync mode.
  • V.54 loopback and V.52 BERT pattern generator.
  • Built-in LEDs enable you to monitor test mode operation.
  • Transformer isolation and surge protection guard against data loss.
  • Automatic line equalization.

  • The Universal Sync/Async Short-Haul Modem gives you the flexibility to use it in almost any UTP or STP application. It's non-powered to you can use it almost anywhere without worrying about power. It provides data rates up to 38.4 Kbps and distances up to 12 miles (19.3 km.). In synchronous mode, the SHM supports internal, external, or receive loopback clocking.

    The SHM incorporates two V.54 and two V.52 BER test modes, which can be activated via the RS-232 interface. Monitor test mode operation via the built-in LEDs. The SHM also has transformer isolation and surge protection to guard against data loss. It's designed to plug directly into the RS-232 interface. The UTP or STP cable is connected via RJ-11, RJ-45, or a terminal block.

    Tech Specs

    Must be used in pairs.

    * Technical specification weight is the unit weight. It is not the packaged shipping weight. For shipping weight, please contact Black Box customer service at 1-877-877-2269.



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