There is a difference between Toslink optical and ATT/ST. The ATT/ST is reputed to be a high quality link and many older high end products offered it, at least as an option. Few do now, tho. Have not compared, but is reported to be way better than Toslink.
Is AT&T a Good digital cable connection ?
Does anybody have experience with AT&T glass digital cables ? Is sit a better connection than coxial ?