| title: | linux dvb Possible patch for CAM CI issues |
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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 Ive
seen. I cant imagine how one create such an "analog" clock signal from
a digital source...
I am sorry to hear that... Unfortunately for me, I cant 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... Ill have a look at en50221.
Hmm, Ive had a look. Unfortunately, even though the CAM control protocol is
massively overdesigned for what is needed, it doesnt seem to provide any
support for error detection or retransmission of corrupt messages!! :(
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