Hi Paul,
Ah-ha! Things are becoming clearer. I now see the 'problem' with my plan to use any of the 1GB front ports. I know it is possible with other makes of switch.
So, I obviously need a stacking cable, details were kindly supplied by Ronald in the previous response.
I have the XOS User Guide which covers "Converting a Standalone Node Deployment to a Stack"
Are there any other documents that would help me on this task?
Regards,
Jason