21. An optical system as in claim 1 , wherein the subscriber unit further comprises a media access controller and a data flow management controller.
21. An optical system as in claim 1 , wherein the subscriber unit further comprises a media access controller and a data flow management controller. 34. An optical system as in claim 21 , wherein the subscriber unit further comprises one or more electronic modules selected from the group consisting of: a set-top box, a video recorder, a place shifter and a time shifter.