What is the Laymans Explanation of the Term BT Lin...

If someone could explain, in the simplest terms,
A. What is meant by "Linear Multicast Channels" (please no links !!) and what are its advantages over what we presently have with our present BT Vision service
B. Do any other providers use this system at the moment
C. (i) Do any BT Vision Boxes presently in use, use this system NOW. (ii ) if not, are any boxes already pre equiped NOW to be able to use this system when its rolled out, (iii) if so, which present boxes have this capability
I ask this basic question as this subject is often discussed on this forum and I haven't a clue what it really means.
Thanks
Solved!
Go to Solution.

A) Linear multicast channels are live broadcasts over the internet. So, for example, BBC1HD will be coming to you over the wire rather than the aerial. Multicast is a one to many transmission mechanism which means that the channel only has to be sent over the network once and anyone who wants it picks it up as it comes in. This is distinct from Unicast which means that each device which wants the broadcast has its own copy flying across the network which doesn't scale well for mass communication. Multicast needs specialised hardware on the network to make it happen.
B) There are other providers which offer live channels over the internet, but whether they're using uni- or multi-cast, I know not. I seem to be remember reading that the other providers don't allow recording of the channels (yet), however BT are going the whole hog and allowing 2 channels to be recorded. Things may have moved on, though, so willing to be corrected on the first bit.
C) Any of the boxes running the new software can be easily upgraded to get the multicast channels. There are people on this board who are receiving them. Any black boxes running the old software need to be upgraded to the new software first. Silver boxes can't run the necessary software. YouView boxes can't yet until the software is available later in the year.
Any further confusion, just ask.

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