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).
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).