[MLB-WIRELESS] FW: Linksys RTS/CTS

[Brenton D]

Interesting. I read something like this in one of my
cisco books.

--- Dan Flett <conhoolio at hotmail.com> wrote:
> Interesting explanation of RTS/CTS...
> 
> -----Original Message-----
> From: talk-bounces at seattlewireless.net
> [mailto:talk-bounces at seattlewireless.net] On Behalf
> Of Casey Halverson
> Sent: Saturday, 30 April 2005 8:56
> To: SeattleWireless Talk List
> Subject: RE: Linksys RTS/CTS
> 
> Nearly all serial and radio communications make use
> of some sort of flow
> control, like CTS/RTS .. Its not really ham radio
> per se.  But you will
> find that the 802.11 MAC is very close to AX.25.
> 
> RTS Threshold is what you want.  
> 
> RTS Threshold explanation:
> 
> Frames at and over this threshold size cause the AP
> to reserve the
> medium with RTS.  The AP will also send a CTS to any
> RTS sent.  The idea
> is that a hidden third party will at least hear the
> AP send an "RTS" or
> the client send an "CTS", so it will not cause a
> collision.   
> 
> Any frames under this size will be just transmitted
> without reserving
> the medium.  This would just add severe overhead, as
> your flow control
> would far exceed the size of the packet transmitted.
>  The 802.11 MAC has
> enough overhead as it is.
> 
> Setting a too low of RTS/CTS value will reduce your
> packet/sec rate,
> which will ultimately cause latency. Since many
> interactive applications
> use small packet sizes, it will hit you in the worst
> way.
> 
> You will also see fragmentation threshold, it works
> the same way, except
> it just fragments the packet past a specified size. 
> You probably don't
> want to set this too low.  If you transmit a lot of
> large frames in a
> high noise/error rate environment, it can reduce
> retransmit overhead.  
> 
> The important thing to note is, both above add lots
> of overhead and
> should be used with care.  
> 
> You may want to send beacons more infrequently on
> long links.  Since
> stations and the AP really cant agree on what time
> it is, a frame could
> arrive when a beacon is being sent, vice versa.  Its
> best to keep the
> amount of chatter to a minimum.
> 
> 
> 
> 
> 
> ________________________________
> 
> 	From: talk-bounces at seattlewireless.net
> [mailto:talk-bounces at seattlewireless.net] On Behalf
> Of Franklin S Werren
> 	Sent: Friday, April 29, 2005 1:02 PM
> 	To: SeattleWireless Talk List
> 	Subject: Linksys RTS/CTS
> 	
> 	
> 	OK .... I had to rattle the cobwebs on packet radio
> 	I know about RTS/CTS .... Where is it in a WAP54g
> Linksys
> 	with the Svensoft software....????
> 	Is it labled differently ????
> 	http://www.bagpipes.net/files/linksys-settings.jpg
> 	 
> 	This discussion is getting more and more like a Ham
> packet radio
> discussion .....
> 	 
> 	N2JYG    
> 	
> 	Franklin S. Werren  www.bagpipes.net  
> www.chautauqualake.net
> 	 
> 	My 2 cents: Never get caught between an ISP and a
> telco in a
> pissing match!!
> 	                   The customer looses every
> time!!!
> 	
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> 

Brenton (iViLe)
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