My AE doesn’t look like the one above. As well as the connection, presumably Ethernet, as above with <....> it also has one with a circle made up of dots above another connection. I presume this is also some kind of Ethernet. Will the cable shown above work for mine please?
Can you find a link for it or post a photo of it?
If it has a 3.5mm headphone socket (and your using that to connect up currently) then I'd assume that socket would double as an optical connector too, that its how nearly all 3.5mm sockets on Apple devices work.