Bitrates from 103b TP6

[TheSpecialist]

This transponder has 5 channels, FuelHD, NFLHD, YESHD, and 2 PPVHDs.

The total transponder mux bitrate is 38Mbit. There are five channels of audio, 4 at 395kbps, 1 at 460kbps. On average 1.1Mbit of null packets, leaving approx 36Mbit for video.

So far, no way to tell which program corresponds to which channel. I am assuming the one at the bottom is showing SD content during this analysis.

Also shown are the muxes showing up in the lower band before the B-band converter.

I will post other transponders as I have time.

 

[HDhysteria]

you probably already know this,but of the 5 channels, 4 are 1080i and fuel is the only one at 720p, fuel also as far as I know has only broadcast sd upconverted.

 

[Sean Mota]

so 7.2 mbps for each channel. Anyway to tell what resolution we are talking about here? 1920x1080i or something less?

 

[uncrules]

Thankfully only 2 transponders have 5 channels on them.

TPs 1 and 22 have only 1 channel
TP 5 has 2 channels
TPs 2,12, 13 and 14 have 3 channels
TPs 3, 4, 7, 8, 9 and 10 have 4 channels
TPs 6 and 11 have 5 channels

I rather have fewer channels than load all the transponders up with 5 channels each. I can wait for D11 to get more transponders.

 

[digiblur]

so 7.2 mbps for each channel. Anyway to tell what resolution we are talking about here? 1920x1080i or something less?

I would have to guess no, as the video is most likely encrypted.

I don't think we will know the answer to this question until someone comes out with a R5000 type mod or someone figures out how to view the video on the hard drives.

 

[richiephx]

Well, there's 30 channels left to add by the end of the year. Where might they be added to?

 

[Smith P.]

Well, into same transponders.

 

[TheSpecialist]

Thankfully only 2 transponders have 5 channels on them.

TPs 1 and 22 have only 1 channel
TP 5 has 2 channels
TPs 2,12, 13 and 14 have 3 channels
TPs 3, 4, 7, 8, 9 and 10 have 4 channels
TPs 6 and 11 have 5 channels

I rather have fewer channels than load all the transponders up with 5 channels each. I can wait for D11 to get more transponders.

Unfortunately, every transponder that shows up in the signal strength menu (TP 1,2,3,4,5,6,7,8,9,10,11,12,13,14,17,22) already has 5 channels of audio and video on it. Cannot determine what the "extra" channels really are at this time. Most likely placeholders or maybe even the rest of the promised channels, just not available in the EPG yet.

TP 1 now has additional RSN channel on it. I will update the master channel to TP listing this evening and repost with new additions.

 

[TheSpecialist]

so 7.2 mbps for each channel. Anyway to tell what resolution we are talking about here? 1920x1080i or something less?

Unable to determine resolutions at this time. Maybe someone could chime in with the native resolution of each channel, then a mapping of how many 1080i + 720p channels are combined on each mux would be possible.

 

[TheSpecialist]

you probably already know this,but of the 5 channels, 4 are 1080i and fuel is the only one at 720p, fuel also as far as I know has only broadcast sd upconverted.

Thank you for this good info. Will add a "native res" column to master channel to transponder listing.

 

[Sean Mota]

Unfortunately, every transponder that shows up in the signal strength menu (TP 1,2,3,4,5,6,7,8,9,10,11,12,13,14,17,22) already has 5 channels of audio and video on it. Cannot determine what the "extra" channels really are at this time. Most likely placeholders or maybe even the rest of the promised channels, just not available in the EPG yet.

TP 1 now has additional RSN channel on it. I will update the master channel to TP listing this evening and repost with new additions.

if every tp has 5 channel already, the bitrates for all channels then must be around 7.2 mbps even the ones that subs can see right now. Is that correct? When the other channels are light up the PQ should not degrade further, right?

 

[jefbal99]

Thank you for this good info. Will add a "native res" column to master channel to transponder listing.

newb here, but can you point me a link to the master channel to transponder listing?

 

[JimK2]

This transponder has 5 channels, FuelHD, NFLHD, YESHD, and 2 PPVHDs.

The total transponder mux bitrate is 38Mbit. There are five channels of audio, 4 at 395kbps, 1 at 460kbps. On average 1.1Mbit of null packets, leaving approx 36Mbit for video.

So far, no way to tell which program corresponds to which channel. I am assuming the one at the bottom is showing SD content during this analysis.

Also shown are the muxes showing up in the lower band before the B-band converter.

I will post other transponders as I have time.

Is the Mux bitrate of 38Mbit before or after FEC.

What am I looking at, is this an image of a spectrum analyzer and is each hump a transponder data through-put spectrum pass band.

 

[Sean Mota]

newb here, but can you point me a link to the master channel to transponder listing?

welcome... it is in the first post of this thread...

http://www.satelliteguys.us/directv-forum/111137-directv-10-channel-transponder-mappings.html

 

[Scott Greczkowski]

if every tp has 5 channel already, the bitrates for all channels then must be around 7.2 mbps even the ones that subs can see right now. Is that correct? When the other channels are light up the PQ should not degrade further, right?

Not really.

We are dealing with MPEG4 here not MPEG2, I have seen some very VERY good MPEG4 HD with only a 6 mpbs stream.

Also remember that the transponders which have 5 channels on them, that they are all using VBR (Varible bit rate) and MOST of them are not broadcasting in true HD the majority of the day. When a show is in HD it will take the bandwidth it needs to look good.

Even if all 5 channels are showing full HD at the same time, the PQ should still be about the same as it is now. If they were running 6 HD channels per transponder like Dish is they might need to downres the video like Dish has, but with 5 channels per transponder, they have that buffer space they need to keep everything looking great.

 

[JimK2]

Not really.

We are dealing with MPEG4 here not MPEG2, I have seen some very VERY good MPEG4 HD with only a 6 mpbs stream.

Also remember that the transponders which have 5 channels on them, that they are all using VBR (Varible bit rate) and MOST of them are not broadcasting in true HD the majority of the day. When a show is in HD it will take the bandwidth it needs to look good.

Even if all 5 channels are showing full HD at the same time, the PQ should still be about the same as it is now. If they were running 6 HD channels per transponder like Dish is they might need to downres the video like Dish has, but with 5 channels per transponder, they have that buffer space they need to keep everything looking great.

Pretty sure DirecTV D10 Is using Qpsk and (dish hd) is using 8psk has 20%-25% higher data through put

 

[Scott Greczkowski]

You are correct, I forgot about 8PSK being part of the mix. However with that said, I don't know what DirecTV's in house transmission scheme uses or if there are any benefits gained there.

 

[digiblur]

They are using DVB-S2 which is similar to the 8PSK type of gains. Actually, you'll see DVB-S2 referred to as 8PSK overseas.

It looks like DirecTV is getting 38Mbit per TP after FEC, close to E*'s bandwidth of 41Mbit per 8PSK TP.

 

[JimK2]

They are using DVB-S2 which is similar to the 8PSK type of gains. Actually, you'll see DVB-S2 referred to as 8PSK overseas.

It looks like DirecTV is getting 38Mbit per TP after FEC, close to E*'s bandwidth of 41Mbit per 8PSK TP.

I just looked at the specs for DVB-S2 and the spec's includes QPSK through 32APSK. DVB-S only specified QPSK. The main advantage I see DVB-S2 has over DVB-S is less FEC needed and wider choice of modulation. D10 Q-PSK 20,000 SR FEC 5/6 from Lyngsat, is this now wrong.

DVB-S2 delivers excellent performance, coming close to the Shannon limit, the theoretical maximum information transfer rate in a channel for a given noise level. It can operate at carrier-to-noise ratios from -2dB (i.e., below the noise floor) with QPSK, through to +16dB using 32APSK. The table overleaf (Figure 1) shows the improvements in efficiency that DVB-S2 delivers when compared to DVB-S with typical TV broadcast parameters, with gains in the useful bitrate of more than 30% in each case.
http://www.dvb.org/technology/fact_sheets/DVB-S2 Fact Sheet.0807.pdf

 

[Scott Greczkowski]

I got to add one more thing. The new MPEG4 HD on DirecTV is some of the BEST High Definition quality I have seen from a satellite provider in a LONG LONG time.

This really is a non issue at this point.