[MLB-WIRELESS] Speed degradation over multiple hops

[Mark Aitken]

At 03:19 PM 3/28/04 +1000, Ben Short wrote:


>Now, each link from hop to hop you can send or recieve at about 400kb/s, 
>which is to be expected. However if I download
>direction from hop 6 to hop 1, I am usually lucky to get 10kb/s. There is 
>no other traffic on the network at the time, and
>hidden nodes are not an issue. I am assuming interference is not an issue, 
>because each link can do 400kb/s.


It only stands to reason that each frame has to be totally received before 
it can be re-transmitted at each hop. Therefore there is a finite amount of 
time that is required for each system to receive and re-transmit the 
frame.  This can drastically affect the through put, especially if for what 
ever reason a frame is lost in transit and needs to timeout before it is 
re-transmitted.

Just my 2c worth.

Mark

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