Thank you for using the forums on your issue at hand. So you are wondering if you can hook up your Slingbox PRO-HD to your Cox cable box? That is a great question. To answer your question, yes you can. The Slingbox is designed to connect to any video and audio source. If you have misplaced the user guide for your Slingbox PRO-HD, follow the link below.
When you open the link, to download the PDF file, click on the picture and it will ask you to save the file.
Hopes this helps you,
Sling Moderation Team