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Industrial > Modems, CSU/DSUs, Muxes


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38887

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Asynchronous Local RS-232 Multiplexor, 4-Port  

A mux that won't shortchange you for short distances.

38887

Extended Double Diamond™ Warranty Available
(3 Additional Year)

Product Highlights

  • Time-division multiplexor with an integral short-haul modem.
  • Economical alternative to stat muxes.
  • Four async ports.


  • Description

    Asynchronous Local RS-232 Multiplexor, 4-Port


    Quick Facts

  • Time-division multiplexor with an integral short-haul modem.
  • Economical alternative to stat muxes.
  • Four async ports.

  • Further Details

  • Screw terminal interface on composite port.
  • Support speeds up to 64 kbps per port.
  • Operate at distances up to 3000 feet (914.4 m) over two 24 AWG twisted-pair cables.
  • Plug-and-play installation—no option switches to set.


  • If you're looking for an economical alternative to leased-line modems and statistical multiplexors, the BLACK BOX® Asynchronous Local RS-232 Multiplexor gives you speed and savings in your async environment!

    Here's an economical alternative to more expensive stat muxes.

    Our Async Local RS-232 Mux is a time-division multiplexor that supports 4-channel speeds up to 64 kbps. All ports operate at maximum throughput levels with virtually no multiplexing delay. All models have an internal line driver for twisted pair. The units' internal line drivers provide limited-distance communication over private networks with point-to-point twisted-pair cabling.

    Our Asynchronous Local RS-232 Multiplexor automatically adapts port speeds to the rates of your individual terminals—no clock source is required. Plus, synchronization between multiplexors is maintained automatically.

    NOTE: Must be used in pairs.

    This product works with:
    • CAT5 100-MHz Solid-Conductor Cable, 4-Pair, Straight-Pinned (EYN737MS)
    Questions? Contact our FREE Tech Support.


    Technical Specifications for Asynchronous Local RS-232 Multiplexor, 4-Port:

    Distance (Maximum) 3000 ft. (914.4 m) on (2) twisted-pair cable (24 AWG)
    Multiplexing Technique Time division
    Operation Full-duplex
    Speed (Maximum) 38887: 64 kbps per port;
    38889: 38.4 kbps per port;
    38891: 19.2 kbps per port
    Protocol Async
    Interface Channel: RS-232;
    Composite: 4-wire terminal block
    Connectors Channel: 38887: (4) RJ-45; 38889: (8) RJ-45; 38891: (16) RJ-45;
    Composite: 4-screw terminal block
    Power 115-VAC, 60-Hz external power supply
    Size 38887, 38889: 1.7"H x 7"W x 5.3"D (4.3 x 17.8 x 13.5 cm);
    38891: 2.2"H x 7"W x 5.3"D (5.6 x 17.8 x 13.5 cm)

    NOTE: Must be used in pairs.

    This product works with:
    • CAT5 100-MHz Solid-Conductor Cable, 4-Pair, Straight-Pinned (EYN737MS)
    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 877-877-2269.


    Resources for Asynchronous Local RS-232 Multiplexor, 4-Port:

    Product Data Sheets


    Connect your Asynchronous Local RS-232 Multiplexor, 4-Port with:

    Accessory: 523951

    Modular Adapters

    Modular Adapters, DB25 Male/RJ-45 for DTE

    Accessory: EYN556MS-0010

    CAT5e Solid-Conductor Patch Cable, PVC, Straight-Pinned, Beige, 10-ft. (3.0-m)

    CAT5e Solid-Conductor Patch Cable, PVC, Straight-Pinned, Beige, 10-ft. (3.0-m)

    Accessory: 523952

    Modular Adapters

    Modular Adapters, DB25 Female/RJ-45 for DTE

    Accessory: 523953

    Modular Adapters

    Modular Adapters, DB25 Male/RJ-45 for DCE

    Accessory: 523954

    Modular Adapters

    Modular Adapters, DB9 Female/RJ-45 for DTE

    Accessory: 522306

    Null-Modem Adapters

    Null-Modem Adapters, Pinning A, DB25 Male/Male

    Double Diamond Warranty

    Standard Manufacturer's Warranty


    A warranty is included.

    Extended 1 Year Warranty Available


    Protect your purchase with an additional 1 Year Double Diamond™ warranty!
    Cost: $43.60

    Extended 3 Year Warranty Available


    Protect your purchase with an additional 3 Year Double Diamond™ warranty!
    Cost: $87.19

    Diamond

    Double Diamond™ Warranty (Standard)

    Coverage:

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


    The Double Diamond Warranty is our no-questions-asked warranty that protects your Black Box® brand products* from accidental damage, including drops, water, and power surges.

    Most of our products come with a one- or two-year warranty. Some products—such as copper cables, manual switches, cabinets, and racks—are even guaranteed for life!

    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.

    * Certain products may not be eligible.

    Warranty Compared

    Black Box® Double Diamond™ Warranty The Competition
    Warranty Length One Year to Lifetime, Depending on the Product. Read the fine print.
    Guaranteed for Life! Black Box® Brand Copper Cables, Manual Switches and More! No.
    Accidental Damage 100% Covered! No.
    Water Damage 100% Covered! No.
    Power Surges 100% Covered! No.
    Warranty Replacements No Questions Asked! ?
    Tech Support Hotline 100% FREE! $$$

    What’s more, we also have a 45-day, no-questions-asked 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.

    You can find this product in the following subcategory(s)
     

    Add to Cart

    Price: $435.95

    Quantity Available: 1

    Quantity

    Warranty

    Total

    (1 available)

    Shipping Info

    Weight: 2.2 lbs.
    HxWxD: 2.6 x 11.4 x 15.3 in.

    What’s more, we also have a 45-day, no-questions-asked 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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