There's enough bandwidth to get 3HD streams at once, in fact, there's enough to get at least 4HD streams - you could try for a 5th, but that might be pushing it depending on the content of the HD feed (if it's live action, it will use more bandwidth then say, something with a largely static picture). MTS doesn't offer more then 2HD/1SD because they've dedicated a portion of that bandwidth to Internet usage (whether you have Internet with them or not). They will also tell you that their research shows that the majority of households only use/require 3 streams (although I think this is flawed, and doesn't include a household where a PVR may be using additional streams). MTS limits the accounts in Microsoft Mediaroom to 2HD/1SD - so if he's getting 3HD - I'm guessing one of his MTS boxes is on someone elses account and not his, that or there's some sort of glitch. Can he access his recordings remotely from all Set Tops? or does one not show the list?
@davidb1, even if the boxes weren't all on the same account, that wouldn't explain why the PVR recorded 3 HD streams while watching 1 SD live on the PVR.
Based on my stats and my checks with Wireshark:
Lightning Internet 7.5 Mbps
Modem Downstream Rate 35 Mbps
Bandwidth allocated to PVR 25 Mbps
3 HD * 6.8 Mbps ... 20.4
1 SD * 2.7 Mbps ......2.7
Total ................... 23.1
4 HD * 6.8 Mbps ... 27.2
5 HD * 6.8 Mbps ... 34.0
I also recorded 1 hour of CNNHD talking heads and checked my disk space before and after. It looks like it uses the full bandwidth regardless of the content. My guess is the encoders are optimized to get the best picture possible within the bandwidth allocation.
I don't know what the minimum speed that MTS require before provisioning TV, but I don't see why they don't assign a 3HD/1SD profile to those lines that can handle it. Assuming I have a fairly standard configuration, that profile would only require 30.6 Mbps for TV and Internet. Admittedly, having different profiles can cause confusion and hard feelings among those subscribers that can't get the highest profile.
As a point of interest, AT&T, Bell and Telus all allocate 4 streams where conditions permit.
Are the HD streams only 6.8Mpbs? I thought I read on this forum that MTS doesn't apply any additional compression and that the feed from the headend is 9Mbps.
I have noticed more motion artifacts lately but I haven't been watching much TV and thought it was just that program. Maybe additional compression has been applied which would be disappointing since the picture quality was a big improvement from Shaw.
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