We run as many as 4 G mode with 16 dB 60 degree sectors. The AP uses WLM54SuperG Atheros radios with X2 cloaking so this means the 4 channels are not overlapping. We are in a valley and the AP sites are typically on the sides, so that we do not require coverage on the back side. Some of my towers use only 2 radios with 16 dB 60 degree sectors pointed straight down the valley and people from the back side can still get a usable -85 dB. We use the WLM54SuperG radios (from Compex) on the AP and client and we are very happy with the performance. The Client is using a 14 dB Rootenna for the case and antenna in one. Just drop the cat5 with POE to the user provided switch and it is online.
For a microcell we use 5 GHz to feed the site with one CM9 radio and we then use a 15 dB omni for 2.4 GHz and we use the other two radios for 900 MHz and another 5 GHz feed to another site. Most of my subscribers can now see at least 3 and as many as 6 of my Access Points. This gives me an incredible ability to switch them if I need. This is Mesh, plain and simple. The ability to have multiple choices is what Mesh is all about. If the backbone is Mesh then all sites will have multiple paths to the Internet and a single failure merely has everyone move to another AP and Mesh Routing takes care of the move. I can pull the power plug on an AP and within 1 minute all users are automatically moved to another AP and are back surfing. I know this goes farther than the B versus G debate that was started, but the key thing in being able to do this is the cloaking with its reduced RF spectrum use. A B mode AP cannot do cloaking, nor can your AP do it if the AP is not an Atheros with a driver that properly supports the ability. B is dead and is holding the Industry back. If you use B mode then you NEED 400 mW radios because of the noise. If you use G mode and X2 cloaking then you need less than 100 mW and you'll have WAY better performance. Just to be sure about this point --> I am speaking from EXPERIENCE. This is not some plan I someday hope to try. It is what we use and is what a lot of others use as well. OFDM was invented as an improvement over previous modulation techniques. Why do people have such a hard time accepting that it actually works better? Is it because you have an investment in B only radios and realize you have to reinvest in G radios? It is sort of like the phone companies hanging onto their copper lines. Wireless started to cream them and now you are seeing that G is creaming B, so that the old established operators are in trouble. Lonnie On 2/4/07, Mac Dearman <[EMAIL PROTECTED]> wrote:
How are y'all running "G" in so many places? I would love to implement G, but I have so many towers sectored out and then we have so many clients running wireless routers close to the CPE that I feel like there would be trouble in Paradise here!! Are any of you running G on anything but an Omni antenna? (Multiple antennas on one tower?) Mac -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Lonnie Nunweiler Sent: Sunday, February 04, 2007 12:30 PM To: WISPA General List Subject: Re: [WISPA] Typical OFDM CPE antennas Totally agree. A bad G link will still give as good as a GOOD B link. G will give 5 mbps even when it is close to not connecting and B requires superb signals to get 5 mbps. Lonnie On 2/4/07, George Rogato <[EMAIL PROTECTED]> wrote: > I have quite abit of G out there. All the clients and ap's I install > today are G. > 60's is great, 70's work just fine too. > 60's get top performance, 70' is still a great very fast connection and > even low 80's beat B. > > B stands for Bad > G stands for Good > > > > > > Marlon K. Schafer wrote: > > It's not about antenna size. It's about signal levels. > > > > Most g radios need -60ish signal levels to work well. Use the antennas > > that you need to make it work right. > > > > Find the sensitivity levels of the product you are using, run the calcs, > > and compute a 10 dB or so fade margin. > > > > laters, > > marlon > > > > ----- Original Message ----- From: "Tom DeReggi" > > <[EMAIL PROTECTED]> > > To: "WISPA General List" <wireless@wispa.org> > > Sent: Saturday, February 03, 2007 12:38 PM > > Subject: [WISPA] Typical OFDM CPE antennas > > > > > >> I wanted to get some feedback from the List. > >> > >> Typically, what Dbi gain antennas are you desiring for OFDM short > >> Near-LOS or Mid-range CPE links? > >> Is 18 dbi enough? > >> > >> I'm well aware that 18dbi will not be good for many applications (long > >> range or noisy), but what percentage of CPE installtions would it be > >> good for? > >> Could 75% of the CPE installs be acheived with 18dbi? > >> > >> I personally, would pick a 21-23db antenna as a preferred choice, but > >> PacWireless Rootennas are 19dbi, and often used with 13-15 dbm CM9 > >> cards. The beamwidth of 18dbi (< 20-30 degrees) is pretty good for > >> interference resilience and OFDM maximized, and if more gain was > >> needed it could be accommodated with higher power radios such > >> Teletronic's >18dbm Atheros cards or Ubiquiti's SR5 18-26db cards. > >> > >> Tom DeReggi > >> RapidDSL & Wireless, Inc > >> IntAirNet- Fixed Wireless Broadband > >> > >> > >> -- > >> WISPA Wireless List: wireless@wispa.org > >> > >> Subscribe/Unsubscribe: > >> http://lists.wispa.org/mailman/listinfo/wireless > >> > >> Archives: http://lists.wispa.org/pipermail/wireless/ > > > > > > -- > George Rogato > > Welcome to WISPA > > www.wispa.org > > http://signup.wispa.org/ > -- > WISPA Wireless List: wireless@wispa.org > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ > -- Lonnie Nunweiler Valemount Networks Corporation http://www.star-os.com/ -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
-- Lonnie Nunweiler Valemount Networks Corporation http://www.star-os.com/ -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
