Video-on-demand services using public switched telephone network
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United States of America Patent
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Apr 25, 1995
Issued Date -
N/A
app pub date -
Apr 2, 1993
filing date -
Sep 27, 1991
priority date (Note) -
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Abstract
A public switched telephone network (PSTN) provides digital video signals from a video information provider or digital service bureau to one or more of a plurality of subscriber premises. Administration of orders from subscribers is carried out by a video gateway and file servers at the central office. Asymmetrical digital subscriber line interface (ADSL) units over a local loop carry the necessary signalling between the subscribers and information providers. The interface units frequency multiplex digital video information with voice information to the subscriber and support transmission of a reverse control channel from the subscriber to the central office for transmission back to the information provider. Several enhancements and special features are disclosed.
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