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New Member

different SSIDs on the same APs, different standards (b/g, g only), what speed

hi cisco support community,

following scenario:

LAPs configured on a 5508, 2 different SSIDs on the same LAP

ssid1: 802.11g only

ssid2: 802.11b/g

clientA connects to the LAP with ssid1 an communicates with 54MBit/s

clientB comes up and connects to the same LAP with ssid2 using 802.11b standard and communicates with 11MBit/s

what is the result?

is it that clientA is "downgraded" to 11MBit/s ?

or

is it that clientA is communicating with 54MBit/s and clientB is communcating with 11MBit/s?

thanks you very much for answering my question. ;-)

-- Regards, Manuel
  • Getting Started with Wireless
3 ACCEPTED SOLUTIONS

Accepted Solutions

different SSIDs on the same APs, different standards (b/g, g onl

Client A will still be connecting to the AP at 54Mbps.

What will happen, is when cleintb connects at 'b' rates, cleintA will need to wait for it to finsih sending

So it doesn't affect the connection between the cleint and the AP, but it will cause the faster clients to need to wait for the slower client to finish sending.

Steve

HTH, Steve ------------------------------------------------------------------------------------------------ Please remember to rate useful posts, and mark questions as answered

different SSIDs on the same APs, different standards (b/g, g onl

Correct.  Wireless is half-duplex.  Only one device can speak at a time.  Everytime the slower client send, all the others have to wait.

Steve

HTH, Steve ------------------------------------------------------------------------------------------------ Please remember to rate useful posts, and mark questions as answered

different SSIDs on the same APs, different standards (b/g, g onl

yes, it would be the same.

HTH, Steve ------------------------------------------------------------------------------------------------ Please remember to rate useful posts, and mark questions as answered
6 REPLIES

different SSIDs on the same APs, different standards (b/g, g onl

Client A will still be connecting to the AP at 54Mbps.

What will happen, is when cleintb connects at 'b' rates, cleintA will need to wait for it to finsih sending

So it doesn't affect the connection between the cleint and the AP, but it will cause the faster clients to need to wait for the slower client to finish sending.

Steve

HTH, Steve ------------------------------------------------------------------------------------------------ Please remember to rate useful posts, and mark questions as answered
New Member

different SSIDs on the same APs, different standards (b/g, g onl

thank you very much for your fast reply, Steve

if I understand you correctly, it does not affect the speed when the clientA is sending something, but if there is a clientB connected, clientB may cause the whole network to be slower in that way, that the radio can not handle communication at the same time for different speeds ?

-- Regards, Manuel

different SSIDs on the same APs, different standards (b/g, g onl

Correct.  Wireless is half-duplex.  Only one device can speak at a time.  Everytime the slower client send, all the others have to wait.

Steve

HTH, Steve ------------------------------------------------------------------------------------------------ Please remember to rate useful posts, and mark questions as answered
New Member

different SSIDs on the same APs, different standards (b/g, g onl

okay, this was the answer I needed... half-duplex... stupid me!

but than, to bring this to an end, if a client, for some reason, connects with just 1Mbps, it is the same procedure.

correct?

-- Regards, Manuel

different SSIDs on the same APs, different standards (b/g, g onl

yes, it would be the same.

HTH, Steve ------------------------------------------------------------------------------------------------ Please remember to rate useful posts, and mark questions as answered

different SSIDs on the same APs, different standards (b/g, g onl

To be more specific WiFi uses CSMA-CA which uses 2 senses, Phyiscal and Virtual. Phyiscal where by a device listens to the medium before transmitting. Virtual whereby a device will use NAV timers.

__________________________________________________________________________________________ "Satisfaction does not come from knowing the solution, it comes from knowing why." - Rosalind Franklin ___________________________________________________________
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