• Black Box Products
Prices listed do not include shipping and/or tax charges. Please call for quote.

Voice Communications > Phone Line/Fax Line Management

click photo to enlarge


Photo may show similar product

Other views

Out-of-Band Network Switch, Telephony Firewall, Call Router  

Designed for out-of-band network access to service ports.


1 YEAR DoubleDiamond™ Warranty (Standard)

Product Highlights

  • Provides a secure and controlled "out-of-band" communications path to service ports.
  • Telephony firewall protects device access with user defined security access codes.
  • Automatically screens and routes all incoming voice, fax, and modem calls to the correct equipment.
  • Multiple emergency barge-in ports assigned by user, for priority outbound calls.

  • Further Details

  • Caller ID "store and forward" CID is sent to device on first ring.
  • Display shows port in use and read back during programming.
  • Enables secure access control to third-party service providers.
  • Phone-line sharing reduces telecom costs by eliminating dedicated phone lines.
  • Security access codes programmed by user, up to seven (7) digits.
  • Operates on AC or DC power.

  • The Black Box Out-of-Band Network Switch, Telephony Firewall, and Call Router Switch enables businesses to communicate with remote telcom and IT network assets more efficiently and securely while cutting costs. Share up to five connections on one phone line. The TL500A can be used to routinely access remote service ports to network equipment and to provide redundant POTS connectivity to equipment when the IT network is down. The switch automatically routes incoming calls to modems, faxes, phones, and/or service points. Vulnerable PSTN pathways are protected with seven-character security access codes (DTMF), creating a telephony firewall for dial-up devices.

    Standard features:
  • Automatic fax detection
  • DSL compatible
  • Dual surge protection
  • No software to install
  • Made in the U.S.A.!

  • Approvals — FCC Industry Standard
    Display — (7) seven segment LED
    Operating Temperature — -20° to +120° F (-30° to +50° C)
    Power — AC transformer: Input: 100–240 VAC, 50–60 Hz;
    Output: 12VDC
    Dimensions — 1.4" H x 6.3" W x 9.5" D (3.5 x 16 x 24 cm)

    This product includes:
  • Out-of-bank network switch and call router
  • (1) power supply
  • Mounting kit
  • RJ-11 cable
  • User's manual

  • 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.


    • Call Router and Out-of-Band Network Switch User Manual
      User Manual for the TL500A (Version 2)

    Double Diamond Warranty
    1 YEAR DoubleDiamond™ Warranty (Standard)

    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 Out-of-Band Network Switch, Telephony Firewall, Call Router 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.

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

    Add to Cart

    Price: $416.10

    Quantity Available: 9




    Shipping Info

    In Stock - orders received before 5PM ET ship same day

    Weight: 2.122 lbs.
    HxWxD: 0 x 0 x 0 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.

    Share It   

    Got Questions?

    Call 1-800-316-7107
    ...or have us call you.

    An expert will call you in
    30 seconds. It's live and it's free.

    (U.S. and Canada Only)


    You have added this item to your cart.

    Important message about your cart:

    You requested more of "" than the currently available. The quantity has been changed to them maximum quantity available. View your cart.

    Black Box 1-800-316-7107 Black Box Network Services