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643 posts

Ultimate Geek

# 10574 29-Nov-2006 16:29

The other night I saw a new TV decoder plugged into a cable modem via ethernet and I'm just curious, how does Telstra's digital television work? How does this work when a customer wants digital TV and Internet? Is it an IP multicast service?

I really want to plug a bridge sniffer in between the modem and decoder to find out but thought I should ask the geeks on here first. If you can paste any links to technical docs/info about the system would be great!

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  # 54172 29-Nov-2006 16:36
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as far as i know. the cable modem is for EPG data and PPV ordering, and software update (if any).

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  # 54173 29-Nov-2006 16:44
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The cable modem is just a return path for PPV and to access the EPG. The video itself is a DVB-C MPG stream using irdeto encryption.


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  # 54178 29-Nov-2006 17:18
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Do they run the EIT (EPG) stream via IP, most DVB systems run it in the main AIS stream as per DVB transport methods.

I understood that only the return PPV and interactive traffic was sent via the IP circuit instead of via phone.


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  # 54570 4-Dec-2006 01:30
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Although, the only interactive feature available on the Cable TV network is the guide itself.

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