Television – Special applications – Manufacturing
Patent
1994-07-07
1996-05-14
Harvey, David E.
Television
Special applications
Manufacturing
359123, 359125, 348 6, H04N 722
Patent
active
055172326
ABSTRACT:
It is desirable to offer the subscribers of a cable television distribution network, in addition to the cable TV service, a video-on-demand service. Since, in the foreseeable future, the fiber-optic portion of the cable television distribution networks will not extend to the subscribers (111) but will terminate in optical network terminations (ONT.sub.i) from which a respective optical access network (108-110) will extend to the subscribers, the problem arises how to transmit the entirety of subscriber-assigned video signals to the subscribers so that the latter can receive the requested video signals. According to the invention, the transmission from the center (100) through the fiber-optic distribution network (101-107) to the optical network terminations (ONT.sub.i) is digital, using time- and wavelength-division multiplexing. In each optical network termination, only that portion of subscriber-assigned video signals is removed which is intended for subscribers connected to the optical network termination (ONT.sub.i). The removed subscriber-assigned video signals are modulated onto subcarriers (M.sub.1 -M.sub.6) and frequency-division-multiplexed with the cable TV signals which are distributed over the electrical access network (108-110) to the subscribers ( 111) connected to the optical network termination.
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Heidemann Rolf
Krimmel Heinz
Alcatel Sel Aktiengesellschaft
Harvey David E.
LandOfFree
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