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Pro Switching System II Universal Serial Cards, RS-232 (DB25)

Add fast A/B switching capabilities to your Pro Switching System II.


Please call 877-877-2269 for a replacement product or part.
3 Year Double Diamond™ Warranty (Standard)

Product Features

  • If you don't need patching capabilities and want economical A/B switch-only capabilities and faster transfer speeds (100 Mbps), order up to 16 of these modules.


  • These universal cards support RS-232, V.35, RS-530, X.21, 10BASE-T, and analog RJ-11 or RJ-45 communications, and they differ only in the interface adapters shipped with them.
  • With their latching relay feature, the Cards forward all traffic in a power failure.
  • When used as a copper path, the Cards operate independenty of speed and protocol.
  • There's no complicated programming.

  • Tech Specs


    * 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 Pro Switching System II Universal Serial Cards, RS-232 (DB25) comes with a standard 3 Year Double Diamond™ Warranty (Standard) 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.