Black Box 1-800-316-7107

Helping you is our priority at Black Box.

We're committed to providing the best customer service in the industry. We're here for you, 24/7, 365.

We'll call you

A technical expert will call you shortly.

Submit Connecting call...

Call Us

Customer Sales & Service Support

Black Box Brand Product Support

IT Services & Voice Support

Send us a FAX


Modular Modem Eliminator, X.21 Module

Incompatible interfaces? No problem. Plug-in modules make the right connection.


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

Product Features

  • Give you freedom to make vital links between otherwise incompatible devices
  • Add up to two modules to your Modular Modem Eliminator Chassis.
  • Convert both the physical and the electrical interface.
  • An on-board, 256-bit buffer ensures efficient data flow to keep traffic moving.

Tech Specs

CE Approval Yes
Connectors ME261C, (1) DB25 F; ME262C: (1) M/34 F; ME263C, ME266C, ME268C: (1) DB15 F; ME265C: (1) DB37 F; ME267C: (1) Coax
Operation Full- or half-duplex
Size 2.7"H x 0.1"W x 3.9"D (6.9 x 0.3 x 9.9 cm)
Speed (Maximum) 512 kbps using internal clock; 2.048 Mbps using external clock
These products work with:
• Standard RS-232 Low-Noise Cable, 25-Conductor, Male/Male (ECM25T, ECM25C)
• V.35 Interface Cable, Male/Male (EYN450T-MM)
• X.21 Cable, Male/Male (EVNX21-MM)
• Coax Cable (ETN59)
Questions? Contact our FREE Tech Support.

* 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 Modular Modem Eliminator, X.21 Module comes with a standard 1 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.