don't worry about the firewire cable - it is .. just the cable (with the multiface) ... eg. e-mu 1010 is using a cat5 cable which also does not *carry* network ...
depending on your motherboard also look out for such devices using PCIe expansion cards (the multiface has one) - would be much more future proof
christian
and remember: only a CRAY can run an endless loop in just three seconds.