I had thought that DVB-S was capable of time-division multiplexing on a single signal, whereas DVB-C was not. Which would mean that the DVB-C in the Motorola box is doing something odd to demultiplex the QPSK-QAM translated signal that another DVB-C might not know to do. And then there's the question of when the CAM is accessed... Any insight?
Incidentally, I ask these by way of preparation. If I have a reasonable amount of confidence that this could possibly work, I'll get started hacking code with y'all. -- Sal smile. On Fri, 22 Nov 2002, Johannes Stezenbach wrote: o On Fri, Nov 22, 2002 at 12:02:15AM -0500, Salvatore Domenick Desiano wrote: o > A DVB-C works with cable and a DVB-S works with satellite. And the DVB-C o > uses QAM demodulation. But what about the MDU set-top boxes (Motorola's o > DSR470 and EchoStar's 3750) -- they use cable wiring and frequencies and o > QAM demodulation, but use each 6 Mhz channel as though it was a 30 Mhz o > satellite channel, and behave just like the low-end satellite set-top o > boxes. o > o > So, the question: is there a DVB card that can handle this odd ball o > QAM/Satellite arrangement? It's common in MDU setups. o o Judging from http://broadband.motorola.com/catalog/productdetail.asp?ProductID=162 o the DSR470 is a DVB-C box with additional analog cable capabilities. o IMHO any DVB-C card which is capable of the specific QAM-modulation o and symbolrate of your network should do. No guarantees, though. o o The special thing about cable networks fed from a satellite feed o is that the NIT (network information table) is invalid and cannot o be used for a service scan (unless the DVB-S to DVB-C converter o replaces it with a new, valid one). But that's a software issue. o o o Johannes o -------------- Salvatore Domenick Desiano Research Scientist NASA Ames Research Center (QSS Group, Inc.) -- Info: To unsubscribe send a mail to [EMAIL PROTECTED] with "unsubscribe linux-dvb" as subject.
