[linux-dvb] General approach to scanning for DVB-C and DVB-S

Philip Boucherat philip.boucherat at ntlworld.com
Sat Sep 2 01:23:36 CEST 2006


I am wondering why Swiss Telekabel publish this information - maybe I 
have just been looking in the wrong places, but it seems that most cable 
operators don't release details like this. Perhaps Swiss Telekabel users 
actually have to enter these parameters by hand? Surely not!

Cheers, Phil

Georg Acher wrote:

>On Fri, Sep 01, 2006 at 01:52:32AM +0200, Robert Schlabbach wrote:
> 
>  
>
>>Now with an 8MHz channel, the specified Nyquist roll-off of 0,15 limits the
>>symbol rate to a maximum of 6956 kbaud. Other symbol rates I know of are
>>6900 kbaud (leaves some frequency margin between channels) and 6875 kbaud
>>(a simple division of the 27500 kbaud of the DVB-S transponders which are
>>fed into the cable network).
>>    
>>
>
>That's what I thought until a few days ago... Then someone sent me the list
>for the Swiss Telekabel:
>
>http://www.telekabel.ch/03/h0301.php
>
>They use half channels with 3.45MBit/s and also some off-raster channels
>(505 instead 506MHz). I have no clue why they are doing that...
>  
>





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