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Author Topic: Variable SNRM on FTTC? (3dB)  (Read 11224 times)

S.Stephenson

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Re: Variable SNRM on FTTC? (3dB)
« Reply #30 on: March 30, 2016, 04:04:47 PM »

A game changer would be something like 4k streaming with no compression or something along those lines.

Uncompressed video tends to use an infeasible amount of bandwidth:
width × height × bits per pixel × frames per second
(3840 × 2160 × 24 × 24) = 4,777,574,400 or approx. 4.8 Gbps

Say more along the lines of blueray quality I know some of my 1080p Bluerays use >50mbps.

So 4K streams could be less compressed and run at higher rates such as 60-120mbps, 8K seems more likely however as I'm pretty sure you need 140mbps to stream it even with h.265.
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gt94sss2

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Re: Variable SNRM on FTTC? (3dB)
« Reply #31 on: March 31, 2016, 04:31:08 PM »

I am sure that someone will have the stats to hand but as most end users are relatively close to the cabinet in the UK, this should mean lowering the target SNRM will enable many more to get higher speeds/80MB - though if they do, then Crosstalk may become a bigger issue than it is today increasing calls for Vectoring..

On the demand for bandwidth - ISPReview recently did an article on what a big impact compression made to reducing the bandwidth needed - and with further improvements expected

Quote
H.264 / AVC MPEG4 720p [MKV]
Video File Size: 987 MegaBytes

Time to download at 2Mbps = 1 Hour 9 Minutes
Time to download at 24Mbps = 5 Minutes 44 Seconds

H.265 / HEVC MPEG-H 720p [MKV]
Video File Size: 243 MegaBytes

Time to download at 2Mbps = 17 Minutes
Time to download at 24Mbps = 1 Minute 24 Seconds

NOTE: We could have compressed the H.265 copy even more and made it just 160MB in size, but this would have lost just a little too much quality.

Full article: http://www.ispreview.co.uk/index.php/2016/03/the-importance-of-video-compression-to-broadband-isp-speeds.html
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