Not sure if the USB connection you're talking about is at the Central or at the computer. If you're talking about the one on the Central, then this Linksys USB/Ethernet adapter will work just fine to tie it to your network for file downloading with JEmplode.

http://cgi.ebay.com/EtherFast-10-100-USB...1QQcmdZViewItem

Randy
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Happy owner of 2 Centrals, 2 Empegs Mk2a 160GB, 1 Empeg Mk2a 60 GB, a Rio Riot, 4 Rio Receivers, and two 1GB iPod Shuffles...