Sync and USB cable

[alex_karate_do]

Hi,
I write from University of Tor Vergata, Rome. Last month we received 2 new v100 cameras, so now we have 8, but maybe we forgot to order enough sync cable, so now we miss one. Is the sync cable a simple rca cable? If so, i think i can buy it in a common electronic shop... Must all the sync cables in use be of the same length or can I use different lengths at the same time?
And about USB cables, i need more lenght again: can i buy common longer USB cables? Must they have some specifics?
Thanks in advance,
Alex

[bsteagal]

Alex:

Yep, sync cable is simple RCA, you can use any length basically. With the USB cables, you don't want to go over 15ft (about 4.5 meters)

Your welcome!

Bryan

[alex_karate_do]

Bryan,
thanks for the help... another question: on Natural Point Optitrack site i saw the USB 2.0 Active Extension Cable : 5m.
"Cables can be used in series (up to 3) for longer distances."
So, why with the extension cables I can reach 5*3=15 m and with a single cable i can't go over 5 m? Has the extension an external power source that gives strength to the signal?

[VincentG]

USB specifications limit USB cables to 5 meters, unless you use an active USB extension cable, or powered USB hub.

We have never tested with more than 2 active USB cables, in series.