Barry L. Kline wrote: > I used dd to create the file I'm sending, so that every test is starting > with the same data and length. How about writing it directly to the device? dd if=source of=/dev/ttyr00 (if that's the device? I forgot) similar to using cat though if it matters you could play with things like block size. Use time to time it, some new versions of dd include progress meters and performance info I believe. nate