Subject: Re: DVB-S2 API vs. HVR4000: When?
Date: Tuesday 6th November 2007 17:23:41 UTC (over 10 years ago)
Johannes Stezenbach wrote: > On Sat, Nov 03, 2007, Manu Abraham wrote: >> If you see H.2 and H.3, the difference is between CCM and VCM >> (Note: that both are cases of multiple "TS's") >> >> H.2 (CCM) is applicable for DVB-T muxes. Here there is a HP/LP >> stream selection in some fashion combined with the merger/slicer >> where stream id is used. > > What makes you think there is HP/LP involved? All H.2 says > is that two DVB-T streams are transmitted using one > DVB-S2 transponder to a DVB-T transmitter. The DVB-T transmitter > could then transmit them on two different frequencies in > non-hierarchical mode. > > (Indeed H.2 says "two DTT MUXes at 24 Mbit/s each" indicating > they are not hierarchical because you can't get that > bitrate in DVB-T hierarchical mode. But even if it were DVB-T > hierarchical mode it has nothing to do with DVB-S2 > backwards compatible mode hierarchical modulation.) > I agree with you, Johannes. There is no evidence of hierarchical modulation, nevertheless the two streams I was looking at had the same channel protection that is no HP/LP, and I was told it was DVB-S2 CCM. When the transponder will be up again I'll be able to do more tests. Francesco