On Monday 07 Nov 2005 18:34, Andrew de Quincey wrote: > On Monday 07 Nov 2005 18:31, Marco Coli wrote: > > Georg Acher wrote: > > > The signal integrity of some CAMs is quite bad. The have slow and and > > > irregular rise and fall times for the clock, with varying setup/hold > > > times for the data. This can lead to data corruption on the receiving > > > side of the CI slot. AFAIK the Matrix cam was one of the worst I've > > > seen. I can't imagine how one create such an "analog" clock signal from > > > a digital source... > > > > I am sorry to hear that... Unfortunately for me, I can't consider a cam > > change, because Matrix and Dragon, as far as I know, are the only ones > > which can be programmed for NDS-Videoguard for sky italy. > > > > > In short: There is so much badly designed crap in the CAM market. It is > > > a wonder that at least some CAM/receiver combinations work... > > > > But in all receiver I tried, my cam worked well, except for my nova card > > > > :-( > > > > Do yiu think, like Andrew suggested, that using a full featured card > > (like the nexus-S one) could be a solution? > > I wonder if it would be possible to simple have some form of retransmission > at the application level... I'll have a look at en50221. Hmm, I've had a look. Unfortunately, even though the CAM control protocol is massively overdesigned for what is needed, it doesn't seem to provide any support for error detection or retransmission of corrupt messages!! :(
