I have dsl and it works for me. I did have some trouble with the clips not working when using Firefox but I needed to upgrade to Firefox 3. (I did have some cutouts during todays live THE Lunchbreak, but the clip works fine now.
Here's their requirements(if that will help)
MULTIMEDIA CENTER HELP The MultiMedia Center provides you with the option of viewing, listening, or downloading your favorite Dallas Cowboys multimedia programming. LIVE programming is streamed in both audio and video. To watch video you must have a high-speed connection to the Internet. If you have an older computer system or if you use a dial-up connection you can still listen to the programming using the audio stream. A list of video requirements are listed below.
The MultiMedia Center requires
Adobe Flash Player 9 to play the audio/video clips.
Browser Recommendations:
Microsoft Windows Users
Miscrosoft Internet Explorer 7
Firefox 3
Click Here to download and install the latest Firefox browser
Macintosh Users
Safari 2.0
Firefox 3
System Recommendations:
Microsoft Windows Users
Microsoft Internet Explorer 7, or Firefox 3
Adobe Flash Player 9
256 megabytes (MB) of RAM - 512 MB recommended
1024 x 768 or higher resolution
16-bit sound card
Speakers/headphones
UPGRADE to the latest Adobe Flash Player for Windows
Macintosh Users
Mac OS X 1.3 "Panther" with Adobe Flash Player 9
Mac OS X 1.4 "Tiger" with Adobe Flash Player 9
Safari 1.3, Safari 2.0, or Firefox 3
256 megabytes (MB) of RAM - 512 MB recommended
1024 x 768 or higher resolution
Speakers/headphones
UPGRADE to the latest Adobe Flash Player for Macs