How do I synchronise my Intel iMac's SPDIF audio input to an external clock source?

How do I synchronise my Intel iMac's SPDIF audio input to an external clock source?
I have a Focusrite ISA One microphone pre-amp with digital ADC card fitted. Both devices are set to 24 bit/44.1kHz and connected by Optical cable (from ISA One to iMac's optical SPDIF input)
I've tried to get the iMac to slave to the ISA One's digital clock by looking in the Audio MIDI set-up but cannot get it out of 'Default' mode. Focusrite tell me it needs to be 'Locked' in the Mac but I can't see how to do that.
The Mac recognises when I change the ISA One's sample rate because Pro Tools gives me an alert, which would suggest that it's receiving data. But all I am hearing on the input is digital white noise.
Any ideas?
Cheers!

USB and FireWire work in very different ways, so there is no adapter.
Instead, you should just get a USB 2.0 hub, like this one
http://eshop.macsales.com/item/NewerTech/USB2HB7PRO/
There are many choices, but be sure to get one that is powered (it comes with its own power supply). Cheaper hubs rely on the computer's USB port for power.

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