Log in
Register
Menu
Log in
Register
Home
What's new
Latest activity
Authors
Forums
New posts
Search forums
What's new
New posts
Latest activity
Members
Current visitors
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
SES and ITV testing new FEC settings
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Fisty McB" data-source="post: 915539" data-attributes="member: 389824"><p>This is a data rate table I've calculated using a SR of 23000 with 8PSK modulation using DVB-S2, it doesn't take into account roll-offs but it does take the FEC as a variable, with pilots on and off...</p><p></p><p>[CODE]DVB-S2 --::-- S/R: 23000 --::-- Mod: 8PSK</p><p></p><p>FEC | Pilot Mbit/s | N/Pilot Mbit/s|</p><p>-----------------------------------------</p><p>3/5 | 39.89 | 40.94 |</p><p>-----------------------------------------</p><p>2/3 | 44.39 | 45.55 |</p><p>-----------------------------------------</p><p>3/4 | 49.93 | 51.25 |</p><p>-----------------------------------------</p><p>5/6 | 55.55 | 57.01 |</p><p>-----------------------------------------</p><p>8/9 | 59.30 | 60.86 |</p><p>-----------------------------------------</p><p>9/10 | 60.04 | 61.62 |</p><p>-----------------------------------------[/CODE]</p><p></p><p>(If you have trouble reading the above table, copy & paste it into Notepad or a similar program.)</p><p></p><p>It shows that going from an FEC of 2/3 to 3/4 gives roughly a higher data rate of around 5.5 Mbit/s while going from 2/3 to 5/6 nets a higher data rate of around 11 to 11.5 Mibt/s.</p><p>I'm assuming that if they're testing an FEC of 5/6 then the 3/4 tests must have worked as expected. They could in theory even go to 8/9 or 9/10, through the jump between them yields only a very small increase.</p><p></p><p>On my Vu+ Duo2, the tuner only reads as high as 14.9 db for the SNR, but both test transponders do go at least that high.</p></blockquote><p></p>
[QUOTE="Fisty McB, post: 915539, member: 389824"] This is a data rate table I've calculated using a SR of 23000 with 8PSK modulation using DVB-S2, it doesn't take into account roll-offs but it does take the FEC as a variable, with pilots on and off... [CODE]DVB-S2 --::-- S/R: 23000 --::-- Mod: 8PSK FEC | Pilot Mbit/s | N/Pilot Mbit/s| ----------------------------------------- 3/5 | 39.89 | 40.94 | ----------------------------------------- 2/3 | 44.39 | 45.55 | ----------------------------------------- 3/4 | 49.93 | 51.25 | ----------------------------------------- 5/6 | 55.55 | 57.01 | ----------------------------------------- 8/9 | 59.30 | 60.86 | ----------------------------------------- 9/10 | 60.04 | 61.62 | -----------------------------------------[/CODE] (If you have trouble reading the above table, copy & paste it into Notepad or a similar program.) It shows that going from an FEC of 2/3 to 3/4 gives roughly a higher data rate of around 5.5 Mbit/s while going from 2/3 to 5/6 nets a higher data rate of around 11 to 11.5 Mibt/s. I'm assuming that if they're testing an FEC of 5/6 then the 3/4 tests must have worked as expected. They could in theory even go to 8/9 or 9/10, through the jump between them yields only a very small increase. On my Vu+ Duo2, the tuner only reads as high as 14.9 db for the SNR, but both test transponders do go at least that high. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Sky Digital BSkyB, Freesat & Saorsat support forum
Sky & Freesat fringe reception
SES and ITV testing new FEC settings
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
Accept
Learn more…
Top