DSTV Satellite bandwidth ?

scud

scud

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I've been wondering how fast dstv can transfer data to your decoder and can't seem to find a good explanation.

What kind of bandwidth is used / or whats the data transfer rate for receiving an HD channel, or watching one HD and recording 2 at the same time? Any ideas ?
 
Your decoder receives the full DStv bouquet the whole time... It then just tunes to the channel it needs.

The signals arrive at the dish in two polarisations. There are 7 Vertical and 6 Horizontal transponders, each carrying a few channels. The transponder frequencies vary in frequency from 10970 MHz to 11594 MHz. The LNB shifts these frequencies down to between 1220 MHz and 1844 MHz, which is the frequencies that your decoders tunes to and it selects the channel needed from the channels carried on that frequency. Bandwidth is around 3-4 Mbps for an SD channel and 8-10 Mbps for an HD channel.
 
Well then why not offer us 5Mbps Internet if you can run 10Mbps over satellite?
 
Because the same thing is being streamed to everyone. Now imagine a 10000 users, each trying to stream a different thing at 5Mbps, at the same time.
 
thanks Quantum - makes a lot of sense, thats quiet a bit of data flying around the sky!!
 
The thing is, it doesn't matter if there is 1 DStv user, or 4 million... Bandwidth stays the same.

The internet is a little different. Hope you understand now Khanya.
 
scud said:
thanks Quantum - makes a lot of sense, thats quiet a bit of data flying around the sky!!
Click to expand...

No problem. To give you an idea, DStv can use around 40+ Mbps per transponder. So they use 500-600 Mbps constantly. When the migrate to the new satellite and DVB-S2 for HD, their available bandwidth will increase dramatically.
 
Quantum Theory said:
No problem. To give you an idea, DStv can use around 40+ Mbps per transponder. So they use 500-600 Mbps constantly. When the migrate to the new satellite and DVB-S2 for HD, their available bandwidth will increase dramatically.
Click to expand...

When will this happen and will we have to upgrade the current HD PVR to a newer one?
 
Khanya said:
Well then why not offer us 5Mbps Internet if you can run 10Mbps over satellite?
Click to expand...


If memory serves me right, they did have a internet service over dstv satelite a while ago, problem was downloading was great (at the time compared to dial up) but on uploading speed was terible you had to use a normal dial up modem , im guesin this has to do with the Transmision capabilities of your dish / LNB
 
isie said:
If memory serves me right, they did have a internet service over dstv satelite a while ago, problem was downloading was great (at the time compared to dial up) but on uploading speed was terible you had to use a normal dial up modem , im guesin this has to do with the Transmision capabilities of your dish / LNB
Click to expand...
Yeah, the dish on its own can't transmit anything at all. It's designed purely to receive the signal
 
For send and receive you need one of these babies and a VSAT modem. Bandwidth costs you an arm and a leg.

vsat-dish-ku-band-ems-2-20.jpg
 
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