On 01/11/08 17:28, Rob Sims wrote:
On Fri, Jan 11, 2008 at 10:03:41AM -0800, johnny wrote:
The graphs say it is clearly not bandwith fault. Reading around:
" It is well known
that the medium access control (MAC) layer is the main bottleneck for
the IEEE 802.11 wireless LANs."
In particular, the hidden transmitter problem really bites 802.11b/g.
If computer A , Computer B, and access point P can "see" each other,
things work better. If A and B can see P, but not each other, problems
arise. A starts transmitting. B doesn't see A, and also starts
transmitting. P gets junk because there are overlapping transmissions.
Neither A nor B see the collision, and have to wait for a timeout before
retrying. This is a large window, because B could start transmitting
any time during A's packet.
This is also a problem when A can see B, and they start transmitting at
the "same" time, but these occurrences are less frequent since the
window is much smaller.
Yet Another Reason why wires are better than wireless.
--
Ron Johnson, Jr.
Jefferson LA USA
"I'm not a vegetarian because I love animals, I'm a vegetarian
because I hate vegetables!"
unknown
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