General Wireless Network Question

Brad Knowles brad.knowles at skynet.be
Sun Oct 12 15:42:53 PDT 2003


At 9:57 PM +0000 2003/10/12, Christian Weisgerber wrote:

>>  I would say that VOIP over 802.11b could very easily be marginal at
>>  best.
>
>  Oh c'mon, standard telephony voice is 64kbit/s.

	That's assuming you can get connected at 11Mbits/sec theoretical 
throughput, which you claim you can only get about ~550kbytes/s.  If 
you can only manage to get connected at 2Mbits/sec or 1Mbit/sec (as 
happens when the signal strength drops), your practical throughput 
will be even lower.  Moreover, your bandwidth estimate for VOIP 
doesn't take into account protocol overhead.  In addition, this 
doesn't take into account how much of that shared bandwidth might be 
sucked down by other clients.

	VOIP can be done over 802.11b.  Vocera has proven it.  But you 
have to have a suitable LAN infrastructure to make that feasible.  A 
single 802.11b access point may very well have difficulty meeting 
those requirements.

-- 
Brad Knowles, <brad.knowles at skynet.be>

"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety."
     -Benjamin Franklin, Historical Review of Pennsylvania.

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