Sewell Accelerator 56K USB Modem

SKU SW-22171


The  USB 56k modem delivers quick and easy fax and dial-up Internet access from virtually any computer. Simply plug this device into the USB port on your PC and you will be ready to dial into the Internet or send and receive faxes. With a convenient low-profile design, this USB 56k modem can travel with you and provide connectivity for your Windows laptop on the go.

Note: This modem is half duplex, meaning it can only send or receive information at a time. Because of this, it is not recommended to be used for voice calls.

USB 56k Fax Modem Diagram

  • Quick and easy setup
  • Low profile, portable design
  • Dial-up Internet access
  • Send and receive faxes from your PC
  • 56k modem speeds
  • Plug and Play
  • No drivers needed for Windows 7,8, and 10

Simply plug the USB 56k modem into the USB port on your PC and connect to an active phone line and you will be ready to connect to the Internet and send or receive faxes all from your PC!

Note: The indicating light may vary in color, but the difference is only cosmetic.


Mfg. Part Number

  • SW-22171 One Jack
  • SW-29644 Two Jacks


  • Sewell


  • USB (type-A Male)
  • RJ-11 (common telephone/dial-up modem interface)


  • Send/Receive Fax with your PC
  • Connect to the internet at 56k dial-up modem speeds

Supported Features

  • ADPCM voice compression
  • Digital Answering Machine
  • Wake Up on Ring
  • Ring Detection
  • On/Off hook control
  • Call Progress Monitor
  • DTMF detection and generation
  • Voice/Fax/Modem Distinction
  • Caller ID (optional)
  • Modem on Hold (V.92)
  • V.80/H.324 interface support for Video Conferencing
  • Half-Duplex
  • Plug and Play
  • No drivers needed for windows 7,8, and 10

Operating Systems

  • Windows (XP, Vista, 7, 8, 10)
  • Mac OS X

Package Contents

  • 1 - USB 56k Modem
  • 1 - 4 ft RJ11 Phone Cable
  • 1 - Mini CD with Win XP Driver
  • 1 - Quickstart Installation Guide

Customer Reviews

Based on 11 reviews
the best modem i ever seen love it

yes thank you this modem started working the first time I tried it no problems at all.. As far as im concerned this is the only store I will shop for modems

It dials, but maybe no internal speaker

Using this on a Windows 8.1 machine and it installed just fine without any drivers necessary. It does what I have asked it to do so far, make some outgoing calls for me on my landline with some delays thrown in and DTMF selections. All of that works as expected, but I can't seem to get any sound out of the modem itself to verify that it hears a dialtone. I thought this model had a built-in speaker, but it might not actually have one!

Part Number: SW-22171
I can hear!!!

Pros: I was able to hear the modem sounds through the speaker, and it was able to connect with remote sites.Cons: Other:

Part Number: SW-22171
Great modem.

Pros: Works as advertisedCons: Other:

Part Number: SW-22171
Great product, perfect installation

Pros: Works with Windows 10, installation happened before I got from the back of the computer to the front. Operation was letter perfect from the outset. Great value.Cons: Other: It is very pleasant when a product does what it is supposed to do without effort.

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