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LAN's for multimedia

R

random1

Junior Member
can some1 please help me with this question?

the capabilites of a typical LAN network (10Base-T) connected via repeater hub are not a good fit for many multimedia applications. briefly explain th ereasons for this and give examples where applicable?

any help would be much appreciated
 
Well, 10BaseT using hubs is a collision-based network, at half duplex. It's rated at 10Mb/s, but in reality, you're usually only going to get about 5Mb/s.

Video tends to be long, constant bitrate transmissions. If you have a high-quality 500Kb/s broadcast you'll only get about 10 of those before you start tapping out the capabilities of 10BaseT. Simple math.

- G
 
collisions and back-off algorithyms lead to varying timing for transmission

multimedia needs consistent transmit times
 
Hub -
A hub is a computer networking device that connects multiple ethernet segments together making thema ct as a single segment. When using a hub only one computer may transmit data at a time. Every device connected to a hub also shares the same broadcast domain an collison domain.

In short what this means is, whenever your computer trys to transmit data on a hub, it has to send it to all machines connected to it the hub until it finds the right location. Which generates alot of traffic an causes collisons.

When you add that onto a 10base-T backbone, that has alow throughput of maybe 5mb if your lucky. You get very slow speeds.

another tidbit if you will, 10base-T or 10/100 or gigabit networking is all marketing schemes, you never get the speeds that they advertise.

You can read some of JackMDS's posts about that.
 
of course you can get the speeds advertised when used full-duplex. That's how fast the data is transmitted and clocked (well the clocking is actually done at 12.5 and 125 Mbs for 10 and 100 Base-T). Ethernet has between 94 and 99% effiency depending on frame size so with 1500 byte frames it works out to 99% utlization.

But when transferring files and using connection oriented protocols like TCP there is a time when the computer has to wait for acknowledgements. That is what prevents you from truly moving data at 12.5 megabytes/sec.

Same goes for 1000 Base. Clocked at 1250 Mbs and capable of near 100 utilization.
 
thanks for that guys.

can u give three ways of improving the above situation and make it more suitable for multimedia transmission?
 
Originally posted by: random1
thanks for that guys.

can u give three ways of improving the above situation and make it more suitable for multimedia transmission?
Click to expand...

I'd love to but would prefer you do your own homework.

😉
 
Originally posted by: spidey07
Originally posted by: random1
thanks for that guys.

can u give three ways of improving the above situation and make it more suitable for multimedia transmission?
Click to expand...

I'd love to but would prefer you do your own homework.

😉
Click to expand...
LOL, seriously! Not even an attempt to cover up the nature of the questions.
 
lol...its a past exam paper question that im revising...i have an exam next week so i thought i would post it on here to c if i can get a clearer and more accurate answer.
any help would be much appreciated.
 
Post your thoughts on it, and we'll "review and correct." This way, you've done the work and you'll probably get a little more out of it. 😉
 
I agree, the more effort you put in. The better responses you will get from the community here.

I have no problem helping people if they are willing to help them self.
 
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