half duplex , full duplex and other questions

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i mix half and full duplex up each other. books say for "half duplex"
""one pair of wires with a digital signal running in both
directions on the wire""

i couldn't figure this out since i thought we have two wires
here am i wrong?

for full duplex

"two pairs of wires .............."

this means we have four wires? or what

...........................................
and some other questions coming :

for hubs we can't use full duplex ethernet (the book says it)
i ask why?
..................................

then how should i know the cable is half duplex or full duplex?

.....................................

for wan communications which cables i can use?
can i use fiber for lan communications?
...........................
you said i use router-router "utp" if they are close but think
if both are 150 m far from each other?

 

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Kobem,

This will start you off on Duplex. I believe the other questions have been answered in previous posts.

Regards

 

Full and half duplex have nothing to do with the number wires between the ends, but everything to do with each end talking at once.

Think of the classic radio-telephone. If you have to say 'over' at the end of your spiel, and listen to the other end until he says 'over' then that is half-duplex. If you can interrupt and the other person stops then that is full-duplex - as in a normal telephone call.

Harry.

 

On the hubs question. The important distinction is between hubs and switches.

Hubs have little or no intelligence, so can't do two things (like talk and listen) at once. Switches *can* do this - so switches tend to have the capability of full-duplex.

Harry.

 

On how you know whether half or full duplex. Depends on the kit. Some items show this on LEDs. Some items show this on status (i.e. a software enquiry).

Harry.

 

Nice analogy Harry

 

I wouldn't call talking and listening at exactly the same time a normal telephone call

 

Depends, if you're a bloke it's neither and if you're a woman it's only talking.

 

Haha too true

 

Hey I heard that! And to make sure I never do again...




Kobem, was just wondering what book you are using if you don't mind sharing with us.

 

sybex, acording to another post.