Hi Greg- The square-footage models scare me, quite frankly. Rather than a one-size-fits all WAG based on footage, we've come to trust both Ekahau and AirMagnet planning tools for budgetary planning- takes a bit of time to get your attenuation sources right, but the final guestimate ends up a lot more based in reality.
Lee -----Original Message----- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:[EMAIL PROTECTED] On Behalf Of Greg Gardner Sent: Wednesday, November 12, 2008 1:05 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Cisco 11n users On that topic, has anyone taken a look at how many AP's they deployed on a sq ft basis in your environment? We are trying to estimate how many we need for full coverage and it looks like the usual guidelines that Cisco provides (2000-2500 sq ft per AP), doesn't work that well for us. Thanks, Greg Gardner -----Original Message----- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:[EMAIL PROTECTED] On Behalf Of Lee Weers Sent: Wednesday, November 12, 2008 10:53 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Cisco 11n users As far as the range is concerned we do get a greater range with the 1252's. I can't say we use this as a feature, because we didn't have a lot of wireless deployed before. Where we did have it deployed before we have put in more access points to do a capacity model rather than a coverage model. Where I have seen this range improve is I'm working on our Football stadium. In the press box we have a 1242 with a 12dbi 2.4 ghz antenna on one end and a 1242 with a Cisco 2506 (5dbi 2.4 ghz) antenna on the other end. The pressbox is sheetmetal all around it, so in the middle of the 40 ft building we were getting very little signal. So we mounted a 1252 inside in the middle, and we saw the signal just as strong across the field from the 1252 as we do the 1242's. My high watermark on clients is 685. I have seen as many as 65 N clients online. My displeasure with the 1252's are the following: 1. The DOA's. We have had about a 3% failure rate out of the box. This is either the ap or the POE injector. So getting them replaced under Cisco's 1 year limited warranty has been difficult at times. 2. We have to walk out to 1 to 2 of them a week and reboot them, as there weren't any managed solutions that we could afford at the time. The E class switches were just announced, but not released. That and they are too expensive for us. 3. The POE injectors do get pretty warm. When on edge we can fit 9 across on a 19" rack shelf. We originally tied them together to make a solid brick. This made them so hot you can hardly hold on to them. We have since stopped doing this. Give them air flow to stay cooler. -----Original Message----- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:[EMAIL PROTECTED] On Behalf Of Jeffrey Sessler Sent: Tuesday, November 11, 2008 4:09 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Cisco 11n users We are running 11n in 2.4 GHz on the 1252's, but only at 20MHz. 40MHz in 2.4 MHz seems like a very bad idea because of the lack of non-overlapping channels. As for range, the building I'm in is a thick concrete/rebar construction and I can get about 120 feet (exiting the building) from an 1252 AP before I can't see it. That said, I'm designing based on capacity more than range. In the case that capacity is not an issue, I'm shooting for 50-70 foot spacing between 1252s to maximize 5GHz coverage. Jeff >>> "Barber, Matt" <[EMAIL PROTECTED]> 11/11/2008 12:06 PM >>> Anyone running 11n in the 2.4 GHz on the 1252s? 20 or 40MHz? What kind of range from the APs are you seeing? Matt Barber Network Analyst / PC Support Morrisville State College 315-684-6053 -----Original Message----- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:[EMAIL PROTECTED] On Behalf Of Jim Glassford Sent: Tuesday, November 11, 2008 2:53 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Cisco 11n users Greetings, Nothing cutting edge but all seems to be working a OK. (5) 4404s and (1) 4402 all running 4.2.130.0 and same mobility group (83) AP1252 (has one gigabit ethernet port) (246) AP1242 (47) AP1231 (25) AP1220 (41) AP1020 (these will not work on 5.n code) Peak of 1195 users logged in. See peaks of (70) 802.11a, (325) 802.11b, (940) 802.11g, (115) 802.11n devices in various states of probing, associated and authenticated. Lots of devices talking on the air for the number of authenticated users. Thanks to everyone for the great information on this list! jim Lee H Badman wrote: > > Thanks, Lee. If you prefer to do off list, can I call you? If you are > good with on list, I would imagine others are interested- but whatever > you preferJ > > Thanks- > > Lee > > Lee H. Badman > > Wireless/Network Engineer > > Information Technology and Services > > Syracuse University > > 315 443-3003 > > ------------------------------------------------------------------------ > > *From:* The EDUCAUSE Wireless Issues Constituent Group Listserv > [mailto:[EMAIL PROTECTED] *On Behalf Of *Lee Weers > *Sent:* Tuesday, November 11, 2008 1:02 PM > *To:* WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU > *Subject:* Re: [WIRELESS-LAN] Cisco 11n users > > We have 6 4404 controllers running 375 1252's, 106 1131's and 18 1242's. > > I'm not a wireless expert, but I can share some of the things we have > seen with the 1252's. > > *From:* The EDUCAUSE Wireless Issues Constituent Group Listserv > [mailto:[EMAIL PROTECTED] *On Behalf Of *Lee H Badman > *Sent:* Tuesday, November 11, 2008 11:50 AM > *To:* WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU > *Subject:* [WIRELESS-LAN] Cisco 11n users > > Wondering if anyone has jumped in to Cisco 11n yet on any sort of > scale that they wouldn't mind sharing? Especially where 11n APs and > a/g APs are hosted on the same controllers or in the same mobility > groups... looking for general feedback. > > Thanks- > > Lee > > Lee H. Badman > > Wireless/Network Engineer > > Information Technology and Services > > Syracuse University > > 315 443-3003 > > ********** 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/. ********** 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/. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
