[opendtv] Re: Spectrum is too valuable

  • From: Ron Economos <w6rz@xxxxxxxxxxx>
  • To: opendtv@xxxxxxxxxxxxx
  • Date: Thu, 05 Nov 2015 04:35:23 -0800

It's the other way around. All DOCSIS 2.0 and 3.0 downstream data is encapsulated in 188-byte MPEG-2 TS packets. It has to be, because the ITU-T J.83B 256QAM format requires 188-byte TS packets.

See chapter 7 of the DOCSIS 2.0 Radio Frequency Interface Specification for details.

http://www.cablelabs.com/wp-content/uploads/specdocs/CM-SP-RFIv2.0-C02-090422.pdf

And Annex C in the DOCSIS 3.0 Physical Layer Specification.

http://www.cablelabs.com/wp-content/uploads/specdocs/CM-SP-PHYv3.0-I12-150305.pdf

Ron

On 11/05/2015 04:04 AM, Craig Birkmaier wrote:


Regards
Craig
On Nov 4, 2015, at 9:15 PM, Ron Economos <w6rz@xxxxxxxxxxx> wrote:

Why would the PON need to be restructured? DOCSIS 3.0 downstream is MPEG-2 TS.
I don't think this is accurate. DOCSIS 3.0 uses IPv6. It is certainly possible
to map MPEG-2 TS into IP packets, but it is far from clear that this is
necessary or desirable.

Regards
Craig



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