There are TWO ways surround sound gets from the TV to the Amplifier/decoder, and 3 ways sound gets from one to the other total
Mehod one is standard Stereo, not surround, and that's two cables, RCA jacks, normally Red and White color codes (Red is Right, white left) This is NOT surround sound though
You may have a 3rd RCA jack labeled "Digital" or "SP/DIF" or "Dolby" or anything but Left,Right or Video.. This is a digital audio link and carries surround sound
More common is a small black "knob" usually square, you pull it out and behind it is a red light (LED) and a "D" shaped hole with a round hole behidn it.
This is a Toss-Link connector.. there will be another just like it on the back of the Audio Processor/amplifier/receiver. ANd that's how it's done.. Any good audio store will ahve the fiber-optic cable to match.. Even Wall-Mart I suspect
Home is where I park it!