You'll need a plain USB A male - A male cable. It's a plain cable (no electronics in it) like the standard USB cables, but since it violates the USB standard, it's rarely found. A bridge cable won't work as it does have additional electronics in it. Some shops carry those cables, google helps.
Also note that the AJB6000 won't be recognised by Windows (even Windows XP) without drivers. The drivers are available for download from the archos website.