I want to clarify my last statement below. I am not blaming the VAR for the lack of communication as I am not totally sure where the communication breakdown occurred. Cisco may not have communicated this to this particular VAR. I did do my own research on radiation patterns vs. mounting orientation before the physical install of the 1130 APs and I was not lucky enough to run across the recommendation to not mount LWAPs vertically. At that time my knowledge on antenna types, their associated radiation patterns, and use was very limited as well.
Could anyone with more expertise comment on the potential side effects of the RRM algorithms assuming all 1130 APs are in a horizontal orientation when not all are? Thank you, Brian Kellogg Network Services Manager St. Bonaventure University 716-375-4092 -----Original Message----- From: Kellogg, Brian D. Sent: Thursday, May 14, 2009 8:38 AM To: [email protected] Subject: RE: Cisco 1131ABG AP Below is the Cisco engineer's response that we work with: The 1130 AP was developed originally as an autonomous AP. At that time, the documentation allowed horizontal or vertical orientation as the antenna pattern is very spherical. However, when the AP 1130 was upgraded via software to be LWAPP capable, it became necessary to 'fix' the orientation so the various RRM algorithms would perform properly without having to take the orientation of the AP into account in the algorithm. The documentation for using the 1130AP with LWAPP specified a horizontal orientation. This was 'common knowledge' at the time and all 1130 APs for Upstate Medical (one of our first LWAPP implementations in 2006) were mounted horizontally and in fact we had to create a custom bracket to do it. Orientation of the AP should not affect signal strength appreciably. I concur that you should look for other issues. Are you running the controllers with the WCS Software so you can get visibility into the RF environment? My only argument is that the "common knowledge" was not communicated to me by the VAR that we paid for implementation services as we purchased our APs as LWAPs. Thank you, Brian Kellogg Network Services Manager St. Bonaventure University 716-375-4092 -----Original Message----- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:[email protected]] On Behalf Of Hector J Rios Sent: Wednesday, May 13, 2009 10:04 PM To: [email protected] Subject: Re: Cisco 1131ABG AP Well, all I can think is that they must have learned a lesson from the 1130s because the quick start guide for the 1140s has a statement that reads: "The integrated antenna design of the 1140 series access point is designed for horizontal surfaces, (table top and ceiling installations). When mounted to such surfaces, the integrated antennas produce the best antenna radiation pattern. For advanced features such as voice, location, and rogue access point detection, ceiling mounting is strongly recommended." Then they go on to say that you can also mount it vertically in smaller areas. Also, the radiation patterns clearly showed that the radio was designed for horizontal installation. Hector -----Original Message----- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:[email protected]] On Behalf Of Lee H Badman Sent: Wednesday, May 13, 2009 8:37 PM To: [email protected] Subject: Re: [WIRELESS-LAN] Cisco 1131ABG AP Hector- Thanks for the note. Was there any explanation given? -Lee ________________________________________ From: The EDUCAUSE Wireless Issues Constituent Group Listserv [[email protected]] On Behalf Of Hector J Rios [[email protected]] Sent: Wednesday, May 13, 2009 9:23 PM To: [email protected] Subject: Re: [WIRELESS-LAN] Cisco 1131ABG AP Lee, The 1140s are very similar to the 1130s and when we purchased a good number of them for our dorms our Cisco SE made sure that we understood that they were meant to be installed horizontally. It's been challenging to say the least, but that's how we have installed them. Hector Rios Louisiana State University ********** 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/.
