David, Make sure that you have WMM enabled on the WLAN. This is under QoS on the WLAN configuration on cisco WLC/WCS. It needs to be on to enable 802.11n rates. Also, make sure wide-channel is enabled (40MHz).
To confirm what the Mac thinks is going on, enable the display of the WLAN icon in the menu bar, hold down the key, and click on the WLAN icon. Should give you channel, transmit rate, etc. Jeff >>> David Wang <[email protected]> 03/04/09 7:24 AM >>> I am testing Mac OS X 10.5.6 with cisco 1140 a/b/g/n APs, but only see the AirPort's speed up to 78M with 802.11n once, most time it stuck at 54M of 802.11a. Another Linksys 802.11n card can easily up to 240M with 40M channel on 802.11a/n. Do I miss something? David Wang Networking Services, CCS www.uoguelph.ca 519-824-4120 ext 52046 On 4-Mar-09, at 9:00 AM, David Wang wrote: > Looks like Apple is listening: > http://support.apple.com/downloads/AirPort_Client_Update_2009_001 > > About AirPort Client Update 2009-001 > This update is recommended for all Intel-based Macintosh computers > running Mac OS X 10.5.6. > > It addresses issues with roaming and network selection in dual-band > environments. > > > David Wang Networking Services, CCS > www.uoguelph.ca 519-824-4120 ext 52046 > > On 23-Feb-09, at 8:53 PM, Lee H Badman wrote: > >> William, >> >> I have no answers, but would encourage you to vigorously engage your >> local rep and ask for an ear in Apple's development. It took us a >> while, >> but feels like they are starting to get that their products are >> actually >> less than perfect on the WLAN. >> >> -Lee >> >> Lee H. Badman >> Wireless/Network Engineer >> Information Technology and Services >> Syracuse University >> 315 443-3003 >> -----Original Message----- >> From: The EDUCAUSE Wireless Issues Constituent Group Listserv >> [mailto:[email protected]] On Behalf Of William >> Green >> Sent: Monday, February 23, 2009 7:56 PM >> To: [email protected] >> Subject: [WIRELESS-LAN] Mac OSX and 5Ghz >> >> We continue to experience problems with Mac OSX devices preferring >> 2.4GHz (g) networks instead of 5GHz (a/n). We want devices at 5GHz >> whenever possible. From the little we can tell the pllst >> (/Library/Preferences/SystemConfiguration/ >> com.apple.airport.preferences. >> plist) >> appears to be remembering channels seen across our campus-wide SSID, >> and then chooses 2.4GHz for whatever reasons. If you delete the >> slower channels in the plist and don't change APs, it stays on the >> 5GHz channel. Unfortunately our wireless infrastructure is mixed >> (lots of g only) so a user will quickly get a 2.4GHz channel in their >> plist which sticks them in 2.4GHz again. >> >> Does anyone have additional information about this problem? >> Work-arounds (on a campus scale)? Dates for fixes? >> >> >> >> >> -- >> William C. Green e-mail: [email protected] >> Director, Networking phone: +1 512-475-9295 >> ITS (Information Technology Services) fax: +1 512-471-2449 >> University of Texas >> 1 University Station Stop C3800 >> Austin, TX 78712 >> >> ********** >> Participation and subscription information for this EDUCAUSE >> Constituent >> Group discussion list can be found at http://www.educause.edu/ >> groups/. >> >> ********** >> Participation and subscription information for this EDUCAUSE >> Constituent Group discussion list can be found at >> http://www.educause.edu/groups/ >> . > > ********** Participation and subscription information for this > EDUCAUSE Constituent Group discussion list can be found at > http://www.educause.edu/groups/ > . > ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/. </[email protected]> ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
