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Message from jsavage@yorku.ca

Hi,
     We're configuring our first Cisco thin AP deployment using AP3600s.  In a particular high density coverage area we been requested to set the TX power levels to 12mW and 25mW for the 2.4/5.0 bands respectively.  I've calculated that a setting of '4' should provide the 12 mW setting for the 2.4 but I'm somewhat confused about the 5.0.  It appears that the max power in the 5.0 differs when using UNII-1 channels  vs.  UNII-2 channels  vs.  UNII-3 channels.    Do I have this correct?    
 
........thanks in advance...................J
 
Jamie Savage  |  Senior Communications Technician  |  University Information Technology

010 Steacie Science Building  |  York University  |  4700 Keele St. ,  Toronto ON  M3J 1P3 Canada

T: 416.736.2100 x22605  |  F: 416.736.5830  |  jsavage@yorku.ca  |  www.yorku.ca

York UIT will NEVER send unsolicited requests for passwords or other personal information via email.  Messages requesting such information are fraudulent and should be deleted. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.

Comments

Message from jiflorwi@cisco.com

You are correct.  However RRM should handle this for you.  You may want to let that settle first and then adjust if necessary.  If high density, then it is likely that power will want to go low for you.  There is a setting for TPC minimum that will prevent the algorithm from going below your settings preference.  The entry format for this is in DBM.  So you can do the conversion and put the value in there directly.

Jim Florwick
WNBU TME
Cisco Systems

Message from jiflorwi@cisco.com

By the way, power level 1 will likely be fine to get started.  It is very hard to over power 5 ghz you have a lot of channels to work with.  Setting the TPC minimum for 12 dbm will prevent the automatic algorithm from going to low.

Jim Florwick
WNBU TME
Cisco Systems

Message from jeff.paynter@duke.edu

I have successfully used TPC to set a minimum power level in dense coverage areas which eliminates low power areas and provides consistent coverage.

 

Here is an article that talks about the UNII-1 power reduction and the FCC Guidelines, http://www.cisco.com/en/US/products/ps11983/products_qanda_item09186a0080bbfd1c.shtml

 

Jeff Paynter

DHTS Network Services

Duke Medicine

 

From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Jim Florwick (jiflorwi)
Sent: Friday, September 07, 2012 9:10 PM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: Re: [WIRELESS-LAN] setting TX power levels

 

By the way, power level 1 will likely be fine to get started.  It is very hard to over power 5 ghz you have a lot of channels to work with.  Setting the TPC minimum for 12 dbm will prevent the automatic algorithm from going to low.

Jim Florwick

WNBU TME

Cisco Systems


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