I recently bought a Yamaha RX-V357 AV receiver and I want to connect it to my Toshiba SD-350 dvd player. Now on the back of the receiver there are two ports covered with a piece of rubber each. In the manual it shows connecting to a dvd with this and shows the cable type as optical. In the dvd manual it shows connecting to a receiver via co-axial digital cable. Is this the one and the same thing? Looking on different websites for cables I've found co-axial digital cables and also fibre optic cables. I'm confused! At the moment they're connected via composite? (red, white connectors) but as I understand it optical/co-axial is digital and will give better sound reproduction.