What is a glass optical cable?

I bought the 30 or 40 dollar glass cable on ebay (do a search for glass toslink there, it's the one from captnstarstripe), and sold the Wireworld Supernova cable I was using on a megachanger.

The ebay cable sounded a little better, or at least just as good, for 30% the cost of the Supernova.

KP

I also use Captnstarstripe's glass cables for every Toslink application in my system. They sound better than any non glass Toslink I've ever owned, although the priciest one I've ever owned only cost about $150. Captnstarstripe's were about $35 with shipping, and he gets them out to you FAST. I think they showed up within 48 hours of when I placed my order.

Glass optical used to be a reference to ATT glass fiber cable which was a different, much higher quality data transmission line than toslink (ATT glass is the standard for telecommunications equipment.)
Many companies offered ATT digital on audio equipment and still do, which is what the term "glass optical" USED to refer to in digital audio interfaces.

It lost popularity due to the cost of the equipment to properly put a connector on the end, which is also labor intensive).