When "b" users join the "g" game, Cisco says that g throughput will drop to 8 Mbps max (true throughput, after the half duplex affect of wireless) because CTS/RTS is invoked when b is present, where as it's not when g is the only technology in use.
>>> [EMAIL PROTECTED] 03/28/04 09:04AM >>> We are now in the process of upgrading from 802.11b to 802.11g in our Cisco 1200's. Here's what I see so far: In 802.11g, if there are 5 "g" clients buzzing along at 54MB/s and one "b" client walks in the room and connects at 11MB/s, all other clients drop to 11MB/s *during actual network activity from the "b" client*. It appears that when the "b" client is idle or disassociates, the "g" clients enjoy the higher bandwidth again. Not sure if this typical of what I can expect to see throughout the campus as I install more "g" radios, but this is what we see in our test environment. I realize that I can deny connections to the AP at speeds of 11MB/s or less to get "pure g", but we need the mixture. Philippe Hanset wrote: > Eric, > > > You can limit yourself which connection you allow, > "transmit rate". > But bare in mind that a person joining an AP at 1 Mbps > will slow down all the other ones! > So it's not a common denominator effect but a > queuing effect. > When you mix 802.11g and b it gets even worse. > > Philippe Hanset > U of Tennessee > > On Fri, 26 Mar 2004, Eric T. Barnett wrote: > > >>Hello, >> >> >> >>I'm new to the listserv. I read somewhere that the AP's maximum speed >>for all clients is equal to the lowest connected speed, i.e. if one >>person connects at 1Mb then all users on that AP connect at 1Mb. Is >>this true? If so, that would explain why some of my clients end up with >>low speeds and great signal strength. If this is vendor specific, we >>are using Cisco 350 and 1200's on campus. >> >> >> >>Thanks, >> >> >> >>Eric Barnett, CCNA >> >>Wireless Administrator >> >>Information and Technology Services >> >>Arkansas State University >> >>870-972-3033 >> >> >> >> >>********** >>Participation and subscription information for this EDUCAUSE Constituent Group >>discussion list can be found at http://www.educause.edu/cg/. >> > > > ********** > Participation and subscription information for this EDUCAUSE Constituent Group > discussion list can be found at http://www.educause.edu/cg/. -- *************************************************************** Michael Dickson Phone: 413-545-9639 Network Analyst Fax: 413-545-3203 University of Massachusetts Email: [EMAIL PROTECTED] Network Systems and Services *************************************************************** ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/cg/. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/cg/.
