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Q: "Day in the Life" of a Wireless Multimedia Bit ( No Answer,   5 Comments )
Question  
Subject: "Day in the Life" of a Wireless Multimedia Bit
Category: Computers > Wireless and Mobile
Asked by: isoquantic-ga
List Price: $50.00
Posted: 27 Apr 2004 14:13 PDT
Expires: 28 Apr 2004 18:04 PDT
Question ID: 337206
I am looking for something that resembles the "day in the life" of a
wireless multimedia bit, such as a MPEG video stream, as it travels
from source to destination, including interactions with all
intermediary protocol layers on the network and on the source and
desitination clients, media codecs, applications etc. Ideally this
would be something like a table. One column shows each stop along the
way of the bit. The second column shows what protocol layer is active
at that stop, what specifically is happening within that protocol
(must be very technical discussion). Each row in the table provides
the specific details for each bit stop.

I need an answer in days not weeks and will double the payment for an
accepted answer received within three days or sooner.
Answer  
There is no answer at this time.

Comments  
Subject: Re: "Day in the Life" of a Wireless Multimedia Bit
From: andrewxmp-ga on 27 Apr 2004 21:31 PDT
 
"a day in the life" sounds like a fun title, but chances are, the
existance of a single bit will only be for a few hundred milliseconds,
even if it's going across the country...
Subject: Re: "Day in the Life" of a Wireless Multimedia Bit
From: pinkfreud-ga on 27 Apr 2004 21:37 PDT
 
Andrew's right. 

But, from the standpoint of the bit, it might *seem* like a day.
Subject: Re: "Day in the Life" of a Wireless Multimedia Bit
From: isoquantic-ga on 27 Apr 2004 23:35 PDT
 
I hope we are not taking this too literally. A "day in the life" is
simply a metaphor for a description of all the processing done for
say, video streaming, from a source to a destination. So, we start
with some multimedia content, then it gets formatted for sending
wirelessly (eventually) to another destination. The converted signal
traverses a MAC stack. What happens in the MAC technically? Next there
is some travel along the protocol stack above the MAC, eventually to
TCP/IP or TCP/UDP layers. What is going on there at each of these
points? Then we come to session management and presentation layers in
the stack. Again, what specifically is happening at these points?

A nice ladder diagram of all the protocol related actions being taken
at each node between source and destination would be nice.

Is this clearer, now?
Subject: Re: "Day in the Life" of a Wireless Multimedia Bit
From: poe-ga on 28 Apr 2004 03:44 PDT
 
Hi isoquantic-ga,

This is probably too general for the details you're looking for, but
the 'Warriors of the Net' animated documentary certainly should be of
interest to you. It can be downloaded for free in a number of
different languages.

Warriors of the Net
http://www.warriorsofthe.net/

Warriors of the Net - Movie Download
http://www.warriorsofthe.net/movie.html

poe-ga
Google Answers Researcher
Subject: Re: "Day in the Life" of a Wireless Multimedia Bit
From: isoquantic-ga on 28 Apr 2004 08:36 PDT
 
These are all too general in their nature for my needs. For example,
the answers I am seeking need to go beyond statements like "video is
first compressed into a single "media file" for delivery" and dive
into the details of the compression algorithm being used to create
this media file. We must then describe what happens next. The file
must be moved out of a computer to a network. The file must move
through network, data link, and physical protocol layers of the
computer's network interface card. There is a MAC in the NIC. What is
happening there? What happens above the MAC?

Once the media file leaves the computer it is transported wirelessly.
Wireless is the original assumption of my question. What is happening
here? Describe the protocols being used.

When the media file reaches its destination, it then goes through the
reverse of the transmitting process. Describe this in painful detail.

Thanks for hammering away at this guys! Keep going!

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