I couldn't agree more ... George Stefanick
On Jan 5, 2011, at 12:14 PM, Ron Marosko <[email protected]> wrote: > All the more reason why Cisco should do away with "Power Level 1-7" and just > use dBm values in the controller. > > /rolleyes > > -- > Ron Marosko, Jr. > . . . . . . . . . . . . . . . . . . . . . . . . . . > CCIE No. 4526 (R/S), CWNA > Consulting Network Architect > Advanced Technology Services > Global Technology Resources, Inc. > > ________________________________________ > From: [email protected] > [[email protected]] On Behalf Of Jason Boyers > [[email protected]] > Sent: Monday, January 03, 2011 21:26 > To: 'Stalder Dominic'; [email protected] > Cc: [email protected] > Subject: Re: [CCIE Wireless] TX Power for UNII bands > > You’ll also notice in that output on the blog that for 802.11a data rates, > power level 1 is actually 14dBm, while 802.11n data rates are at 11dBm . If > you look at the Cisco site at > http://www.cisco.com/en/US/docs/wireless/access_point/channels/ios/reference/guide/1250_chp.html#wp1194606, > it shows the various output levels for both 11a and 11n for each channel. > And another PDF for the 3500s/1260s is at > http://www.cisco.com/en/US/docs/wireless/access_point/channels/lwapp/reference/guide/3500e1260pwr_chn.pdf. > It’s interesting that the use of 2 transmit antennas bumps up the calculated > EIRP 3dB. That would explain the difference between the listed 802.11a and > 802.11n data rates in the “show” command. Keep in mind that the 1250 AP > (which is what was listed) was tested with antennas up to 6dBi. The total > EIRP listed on the www.air802.com<http://www.air802.com> site shows that the > total for UNI-I is 22bDm. So, with a 16dBm budget, you are left with 14 > (which was the stated max under the APs “show” command). Now that there are > higher gain antennas certified for use with the 1250s (like the 9.5dBi > AIR-ANT5195P-R), you should be careful to put the external antenna gain into > the APs configuration in the WLC. The WLC will then adjust the power output > for the radio based on the band and antenna gain so that the EIRP stays below > 22dBm. > > A lot in there, which makes it quite confusing. J > > Jason Boyers - CCIE #26024 (Wireless) > Technical Instructor - IPexpert > [email protected]<mailto:[email protected]> > > > From: [email protected] > [mailto:[email protected]] On Behalf Of Stalder > Dominic > Sent: Monday, January 03, 2011 7:02 PM > To: [email protected] > Cc: [email protected] > Subject: [CCIE Wireless] TX Power for UNII bands > > Hi George > > Happy new year to everybody on the study list! > > On your blog I found this page: > http://www.my80211.com/cisco-wlc-labs/2009/10/30/what-you-need-to-know-about-tx-power-and-80211a-5ghz-on-a-ci.html > > There you say that the following concerning the power levels (only FCC): > > UNII-1 max 11dBm > UNII-2 and UNII-3 max 17dBm > > Now I found another page: http://www.air802.com/fcc-rules-and-regulations.html > > There they say the following (only FCC, see row Point-to-MultiPoint > Intentional Radiator Power @ FCC 5 GHz BANDS AND RULES): > > UNII-1 max 16dBm > UNII-2 max 23dBm > UNII-2 Extended max 23dBm > UNII-3 max 29dBm > > Im from Europe, so now I am not sure what is correct or if the WLC is not > allowing the max values defined by the FCC. It would help me a lot, if you > can correct me ;-) > > Thanks and regards > Dominic > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
