Digital Fiber Link Transporting Multiple Analog Bands for Agile Conversion
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United States of America Patent
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Issued Date -
Jan 1, 2015
app pub date -
Jun 28, 2013
filing date -
Jun 28, 2013
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Abandoned
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Abstract
A digital (fiber optic) link transports one or more RF digital signal blocks, that when converted into analog and (optionally) converted to a RF center frequency with an D-A converter, form RF analog signal blocks. The RF analog signal block occupies a specified frequency band and is preferably capable of being distributed over a downstream coaxial portion of a HFC network and/or being broadcast. The D-A conversion is performed in a fiber node at a remote location where the transmission medium converts from digital optical fiber preferably to coaxial cable. The multiple RF digital signal blocks may be broadcast to multiple nodes or unicast to a single node. The RF signal blocks allow for any type of band-limited RF signal to be transported. The optical digital traffic to compose a RF analog signal blocks using a D-A converter may be point-to-point Ethernet, or may utilize a software-defined networking controller such as the one described in the OpenFlow™ specification, and may use buffering as necessary.
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