FE_MNCS / FE_DOCSIS (was [linux-dvb] [PATCH] add DVB-S2 support to frontend.h)

Rudy Zijlstra rudy at edsons.demon.nl
Wed Mar 1 10:54:33 CET 2006


Andreas Oberritter wrote:

>On Mon, 2006-02-27 at 22:59 +0100, Marcel Siegert wrote:
>  
>
>> typedef enum fe_type {
>>-	FE_QPSK,
>>-	FE_QAM,
>>-	FE_OFDM,
>>-	FE_ATSC
>>+	FE_DVB_S,
>>+	FE_DVB_C,
>>+	FE_DVB_T,
>>+	FE_ATSC,
>>+	FE_DVB_S2
>> } fe_type_t;
>>    
>>
>
>While we're at it: The TDA10023 also supports MCNS in addition to DVB-C.
>After a quick gaze at [1] I understand that MCNS is somehow connected or
>equal to DOCSIS, which uses shorter TS packets (122 bytes).
>  
>
DOCSIS uses the normal MPEG-2 TS. If you want to, you can mix DVB-C and 
DOCSIS into the same TS. In practice this never happens, as it is a 
costly usage of CMTS resources, and no CMTS supports it.

If you want a peek at the DOCSIS standards, hop over to 
http://www.cablemodem.com/ where you will find all relevant specs. For 
this you want the RF spec.

Cheers,

Rudy





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