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Old 09-14-2011, 10:37 AM
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Join Date: Sep 2011
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Question csma/cd and dynamic rate scalling

Trying to get my head around WIFI in a simple and practical way.

If I have multiple users that are varying distances from the AP and thus each get different band width (dynamic rate scaling) - does this mean that each and every users' throughput is downgraded to the furthest and slowest user?

I base this foolish idea(?) on what I have read in a Cisco text book which states it but does not explain it.

The logic of this is that it does not matter how close or good your signal is , even if you are sitting on the AP, your throughput is based on the user 40 metres away.

Cisco ".. Because wireless technology uses a CSMA/CA mechanism, all clients adopt the speed of the slowest client on
the access point. For example, if three wireless clients are attached to the wireless access point running at
24Mbps, and a wireless client some distance away attaches at 6 Mbps, all clients will run at the lowest speed!..."

Surely I have this badly wrong?

Thanks in advance
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