[linux-dvb] Re: QAM Satellite Feeds

[Johannes Stezenbach <js@convergence.de>]

On Fri, Nov 22, 2002 at 12:02:15AM -0500, Salvatore Domenick Desiano wrote:
> A DVB-C works with cable and a DVB-S works with satellite. And the DVB-C
> uses QAM demodulation. But what about the MDU set-top boxes (Motorola's
> DSR470 and EchoStar's 3750) -- they use cable wiring and frequencies and
> QAM demodulation, but use each 6 Mhz channel as though it was a 30 Mhz
> satellite channel, and behave just like the low-end satellite set-top
> boxes.
> 
> So, the question: is there a DVB card that can handle this odd ball
> QAM/Satellite arrangement? It's common in MDU setups.

Judging from http://broadband.motorola.com/catalog/productdetail.asp?ProductID=162
the DSR470 is a DVB-C box with additional analog cable capabilities.
IMHO any DVB-C card which is capable of the specific QAM-modulation
and symbolrate of your network should do. No guarantees, though.

The special thing about cable networks fed from a satellite feed
is that the NIT (network information table) is invalid and cannot
be used for a service scan (unless the DVB-S to DVB-C converter
replaces it with a new, valid one). But that's a software issue.


Johannes


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