Tweet
What is the even ond the odd CW and how does the change of the CWs work. The providers change the CW every 5 to 10 seconds but how do the use the even and odd CW in this change?
-
If you want to make God laugh, tell him your plans! -
Re: Even and odd CW
Making it simple, CWs is the result of ECMs processing made by the card (or emu, if it is the case).
ECM: Entitlement Control Message - sent by the provider at regular intervals (10 seconds, but also 15 or 20 or 30 ... depends by the provider).
If CWs are correct you will have vision. -
Re: Even and odd CW
how many days are cw actives?Comment
-
Re: Even and odd CW
Cw lasts for only few seconds as gianni said previousely. After that time you need a new one for continoues viewing.If you like my post, please don't hesitate to click on "Thanks"button. Thank you
Comment
-
If you want to make God laugh, tell him your plans!Comment
-
Re: Even and odd CW
Not much to understand: even and odd cws change alternatively ... A-B-A-B-A-B...
Payload can be decrypted only with appropriate cw (which was previously requested by the ecm) so, obviously, cw should be processed in time by descrambling system to have vision.
If cw arrives with too much delay you have glitches, if it never arrives you have a frozen image.Comment
-
Re: Even and odd CW
I've got it (I hope so)!
Tell me if I'm wrong.
It's only the description for the cw-now (odd) and the cw-next (even).
A normal ecm contains a few seconds before cw-changing both cw so that you have the current cw (if you switch to the channel) and the next (for prevent freeze when cw changes).
Just found in a FAQ:
"Almost all the other systems like Via., Ird., Con., Mediag., Nagrav. are based on a EVEN and ODD control word. This means that the EVEN Control Word is used after 4 to 30 seconds after to ODD Control Word and each time the EVEN ECM comes many seconds before the ODD Control Word is expired.
Some encryption systems like NDS are really smart because the ECM is sent to the card and the CW is expected in less than 600 milliseconds so if the internet connection is weak or suffers of latency the CW does not come on time and generates a so called “Freeze”."
I think that's the explaination for some problems on 28°.If you want to make God laugh, tell him your plans!Comment
-
Re: Even and odd CW
Yes, that's true.
Furthermore N*S sends ecms every 10 seconds (the shortest interval that I know) so if server/internet is not fast enough you have glitches every 10 seconds.Comment
-
Re: Even and odd CW
Ohh, sky germany e.g. changes every 7 seconds. The problem with sky_uk is that they send the even-cw 600 msec before the cw changes so the card has only 0,6 sec time to calculate it for preventing freezes. Other providers do this 4 or 5 seconds before the change. This means more time for the cards and more time for CS via internet.
If you want to make God laugh, tell him your plans!Comment
-
Re: Even and odd CW
Sky Italy, Sky UK and Sky Germany freezes so much usually. Maybe VideoguardOhh, sky germany e.g. changes every 7 seconds. The problem with sky_uk is that they send the even-cw 600 msec before the cw changes so the card has only 0,6 sec time to calculate it for preventing freezes. Other providers do this 4 or 5 seconds before the change. This means more time for the cards and more time for CS via internet.
crypt system?
Best regards.__________________________________________________sigpicComment
-
Re: Even and odd CW
why nds system is the onlyone that implies freeze?Comment
-
Re: Even and odd CW
The problem of freeze born from low ecm timing, if the the timing is over 520/550 ms you see glitches, freeze and other problem.
It's just says frome someone, the videoguard crypt don't tollerate a lag over 550ms.Comment
-
Re: Even and odd CW
To massimodea when viewing the log, the response time can be up to 2000ms and still image on the TV screen freezesComment
Comment