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Express 8-Port Mux


Please call 877-877-2269 for a replacement product or part.
LIFETIME DoubleDiamond™ Warranty (Standard)


  • Add Active Star Hubs to control up to 56 devices.
  • Groundbreaking! This is the only fiber mux that features split-polling without requiring performance-robbing PTFs.
  • Includes a field-replaceable, wide-ranging power supply.
  • Also features noise filtering, LED diagnostics, and configurable UTP pin assignments.
  • Supports point-to-point and multipoint.
  • You can separate two AS/400 controller polling groups up to 15,000 feet (4572 m) over multimode cable!
  • Detects standard, 1-Mbps data rates and 2-Mbps IBM 5250 Express data rates automatically for easy upgrades.

    If you've been looking for a way to link your AS/400® controller polling groups over fiber, we have your solution. The BLACK BOX® Express 8-Port Mux enables you to transmit data between your groups over a single fiber pair!

    The Express 8-Port Mux sustains controller redundancy and maximum fiber optic efficiency by multiplexing four ports each from up to two separate controllers. If distance is what you're looking for, you've found it! You can separate your groups up to 15,000 feet (4572 m) over multimode fiber optic cable! Plus, you can add Active Star Hubs to control up to 56 devices!

    This mux supports standard 5250 protocol and equipment as well as the IBM® 5250 Express protocol and advanced AS/400 equipment. IBM controllers support a split-polling feature that enables higher data rates, even when connected to standard legacy devices.

    he Express 8-Port Mux multiplexes the split-polling feature transparently without the need for performance-robbing Programming Temporary Fixes (PTFs). This enables enhanced AS/400 controllers to achieve their maximum throughput potential at either 1 or 2 Mbps, delivering a speed improvement of up to 200%!

    The Express 8-Port Mux has eight shielded RJ-45 ports with configurable pin assignments.

    The fiber link is via ST® multimode connections. The mux can operate in point-to-point and multipoint ring topologies, reducing your hardware requirements by as much as 50%.

    The mux also features automatic rate detection, advanced noise suppression on all ports, LED diagnostics, configurable UTP pin assignments, and a field-replaceable universal power supply.
    This product works with:
    • CAT5e 100-MHz Patch Cable, 4-Pair, Straight-Pinned (EVNSL85)
    • General-Purpose Fiber Optic Cable (EXN4050A)
    • Active Star Hubs (IC207A–IC208A)
    • Twinax Baluns (IC257A–IC259A, IC329A, IC365A–IC366A, IC369A, 31417)
    Questions? Contact our FREE Tech Support.

  • Tech Specs

    Active Pair Port configurable
    CE Approval Yes
    Connectors (8) RJ-45, (1) DB25 M, (1) pair of ST
    Distance (Maximum) Host to mux: 2000 ft. (609.6 m); Mux to device: 2200 ft. (670.5 m); Mux to mux: 6600 ft. (2011.6 m)
    Fiber Optic Budget 12 dB, typical
    Indicators LEDs: Power, Port Activity, Mode
    Input Impedance 100 ohms, nominal
    Power 100-240 VAC, +5 VDC, external
    RoHS Yes
    Size 1.75"H (1U) x 19"W x 8.8"D (4.4 x 48.3 x 22.4 cm)
    Speed 1 or 2 Mbps, depending on IBM 5250 protocol
    Weight 5.6 lb. (2.5 kg)

    * 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.


    Double Diamond Warranty Diamond

    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 Express 8-Port Mux comes with a standard LIFETIME 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.