How do it know? - Canadian TV, Computing and Home Theatre Forums
LinkBack Thread Tools Search this Thread Display Modes

post #1 of 5 (permalink) Old 2009-10-09, 08:00 PM Thread Starter
Join Date: Jun 2008
Location: Trinity Bay, NL
Posts: 102
How do it know?

Like the old joke about thermos being able to keep colds cold and hots hot: how does it know?

What is the method by which the satellite is able turn on and off an XM or Sirius tuner? If a tuner is not powered up at the right time, will it miss its wake-up call? What actually happens inside the tuner to make it active? Is there a lot of bandwidth expended in this kind of housekeeping-signal going out all the time?

Questions, questions, questions....
Phycks is offline  
Sponsored Links
post #2 of 5 (permalink) Old 2009-10-09, 09:37 PM
Join Date: Apr 2008
Location: Windsor ON Cogeco
Posts: 1,072
Not quite sure what you're asking? A satellite doesn't turn your receiver on or off, your power button does. The satellite simply broadcasts the content on your channels, this goes on whether your particular receiver is on, there is no two way communication as far as I understand it. Maybe I'm not understanding your question?

Aquos LC42D64U Yamaha HTR6080 Emotiva XPA-5 Polk CSiA6 RTiA7's RTiA1's Velodyne DLS4000R Mot. 6416 III PS3 Harmony One
wgauci is offline  
post #3 of 5 (permalink) Old 2009-10-10, 06:00 AM
Join Date: Mar 2007
Location: Guelph
Posts: 931
The satellites broadcast the ID of the enabled receivers at some interval. More correctly the uplink includes the ID numbers of the enabled receivers into the data stream to the satellite transponder which rebroadcasts. The receivers have to receive that enabling signal which ( I don't know) may contain the decryption key for the broadcast every so often to keep working.

The same sort of thing applies to satellite TV signals.
timlocke is offline  
post #4 of 5 (permalink) Old 2009-10-10, 07:42 AM Thread Starter
Join Date: Jun 2008
Location: Trinity Bay, NL
Posts: 102
Wgauci, I guess I wasn't as clear as I should have been. I was wondering about the activation and deactivation of a radio (upon payment or nonpayment of a subscription).

Tim, do you know how that actually works? If I am a tuner, what is it that a satelite signal can do to me when it calls my name (as it were) that would make me start producing decrypted sound?

Then, for deactivation, does the satellite have to call my name forever for me to be certainly deactivated? How would the satellite know that I have been listening, and thus deactivated -- so does that data stream have to just grow and grow and grow?

Oh, the puzzles of life....
Phycks is offline  
post #5 of 5 (permalink) Old 2009-10-10, 12:59 PM
Join Date: Nov 2003
Location: Kincardine ON.
Posts: 4,440
It sends you a control message with the current authorization keys. If you unsubscribe, it will send null keys or a command to dump the current valid key.

By you, I mean a message to the SID or your tuner. It will send a signal within minutes of your account status changing, and on a carousel of status key updates, in case your tuner is not connected at the time of the change or key update.

As said, it is the same general principal pay TV boxes work on.
classicsat is offline  

Quick Reply

Register Now

In order to be able to post messages on the Canadian TV, Computing and Home Theatre Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome