Probably because they are putting all their money into antenna design instead of website hosting.. :-)
-B- Eric Rogers wrote: > I just went to their website, and it is down...doesn't give me warm and > fuzzies... :) > > Eric > > -----Original Message----- > From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On > Behalf Of 3-dB Networks > Sent: Monday, November 02, 2009 8:53 AM > To: 'WISPA General List' > Subject: Re: [WISPA] Backhaul Questions > > Ruckus Wireless has beamforming (i.e. smart antenna technology)... does > it > on a packet by packet basis. But it's a WiFi system (although from what > I > understand its being deployed overseas now in Muni-Wifi situations... I > just > proposed to someone using Ubquity Nanostations to them). > > Daniel White > 3-dB Networks > http://www.3dbnetworks.com > > > >> -----Original Message----- >> From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On >> Behalf Of Marlon K. Schafer >> Sent: Sunday, November 01, 2009 2:40 PM >> To: WISPA General List >> Subject: Re: [WISPA] Backhaul Questions >> >> Correction, under the 3 for one rule you can go UP 3 dB in antenna gain >> for every 1 dB of radio transmit power that you go down, but only for >> client side or ptp installations. It STARTS at 30 dB radio and 6dB >> antenna. >> >> So if you have a 30dB radio, it's a 6dB antenna. 29dB radio you can >> > use > >> a 9dB antenna. >> >> 28-12 >> 27-15 >> 26-18 >> 25-21 >> 24-24 >> This is the one that excited me years ago. This meant I could use a >> quarter watt amp, 24dB with a 24dB grid for a ptp link! That'll give >> you a -72dB rssi (54 meg speeds!) at 100 miles! Get this one, -78dB >> rssi at 200 (not a typo, two HUNDRED MILES)! I love big antennas! >> > grin > >> Again, this is only for 2.4 client side installs (radio only talks to >> ONE other radio). >> >> There is a bit of an exception to this rule based on smart antenna >> technology. One that no one has successfully used (as far as I know). >> Vivato and Nivini tried. We (WISPA) did get the FCC to issue a written >> interpretation of the rules allowing us to use routed AP's as a >> substitute for active beam steering systems (in the end it has the same >> effect). >> >> In theory we COULD ring a building with 24dB grid antennas with 24dB >> radios for a 42 WATT system and still be within the power level rules. >> In reality though, antennas are too "leaky" and you'd be hard pressed >> > to > >> avoid massive self inflicted interference. I always wanted to try >> building a system like this though! grin. (disclaimer, it's been a >> while since I studied that part of the rules, the max output power >> > could > >> be lower than 42 watts.....) >> >> laters, >> marlon >> >> ----- Original Message ----- >> From: Jack Unger >> To: WISPA General List >> Sent: Sunday, November 01, 2009 12:17 PM >> Subject: Re: [WISPA] Backhaul Questions >> >> >> EIRP is a TRANSMIT number. "Equivalent isotropic RADIATED power". >> > This > >> is the radiated power on transmit in dBm leaving the transmit antenna >> > in > >> the favored direction compared to the power that would be radiated if >> > 1 > >> milliwatt (0 dBm) were fed into a theoretical isotropic antenna that >> > had > >> 0 dBi (no) gain in any direction. >> >> EIRP = TX power (minus) transmission line loss (plus) antenna gain = >> EIRP >> >> Further, >> >> 2.4 GHz allows more than 6 dBi antennas even with 1-watt radios under >> the "3:1" rule for point-to-point use. This is why CPE can run more >> > than > >> +36 dBm because the CPE are effectively point-to-point radios talking >> > to > >> only one access point. The AP is NOT a point-to-point radio therefore >> > it > >> is limited a maximum EIRP of +36 dBm. >> >> 5.8 GHz allows more than 6 dBi antennas with 1-watt radios for point- >> to-point use. That's how those long 5.8 GHz backhauls can be made to >> work reliably. >> >> jack >> >> >> >> Marlon K. Schafer wrote: >> Yeah. >> >> People all too often forget that eirp is a RECEIVE number not a >> > TRANSMIT > >> number. All it takes is big, big ears and you can hear the other end >> > >from a > >> very long ways away. Makes for much less noise in the area too. >> >> I hate the trend toward high power radios with low power antennas. >> >> You guys do realize that 2.4, 900 and 5.8 gig bands limit you to a 6 >> (that's >> S-I-X) dB antenna if you use a 1 watt (30 dB) radio? Base station >> especially. For CPE you can use higher gain cpe antennas on 5 gig and >> still >> be OK within the rules. >> >> But all of these stupid, noisy, wasteful, cpe systems with 1 watt >> > radios > >> and >> 19dB panels make a mess of your networks. (and mine) >> >> marlon >> >> ----- Original Message ----- >> From: "Mike Hammett" <wispawirel...@ics-il.net> >> To: "WISPA General List" <wireless@wispa.org> >> Sent: Saturday, October 31, 2009 10:50 AM >> Subject: Re: [WISPA] Backhaul Questions >> >> >> 30 dB EIRP with a 44 DBi antenna on each side over 73 miles produces >> > - > >> 75 >> signal. I'll let him say what he did to make it work, but it's >> certainly >> possible. >> >> >> ----- >> Mike Hammett >> Intelligent Computing Solutions >> http://www.ics-il.com >> >> >> >> >> From: Bret Clark >> Sent: Saturday, October 31, 2009 11:02 AM >> To: WISPA General List >> Subject: Re: [WISPA] Backhaul Questions >> >> >> Man...what is the EIRP on these links that people are posting high bit >> rates? As someone else stated, gotta wonder if the FCC won't start >> getting >> suspicious at some point. >> >> Travis Johnson wrote: >> 73 miles... and I get 28Mbps total (14Mbps each direction) using a >> 20mhz >> channel. >> >> Travis >> >> >> Josh Luthman wrote: >> Travis is getting 28 megs on a really long backhaul - like 58 miles? >> >> You will not see >30. >> >> On 10/31/09, Eric Rogers <ecrog...@precisionds.com> wrote: >> Ok guys...Looking for both Mikrotik experience and others. We >> currently >> have a Mikrotik backhaul between each of our towers using NStreme and >> > we > >> have been extremely happy with the performance. We recently upgraded a >> tower because we were hitting 15M or so during peak times and was >> > afraid > >> it couldn't handle much more. We upgraded that backhaul to a Motorola >> PTP for future capacity. >> >> >> >> The questions: >> >> >> >> MT Gurus: >> >> Each backhaul ranges in distance, each ranges from 3 miles (3 >> > backhauls) > >> and the rest are about 12 miles (5 backhauls). Since we have been >> > using > >> Mikrotik, I have reliably seen up to 10 Meg, and I am afraid 15 Meg is >> pushing the envelope on a 20 MHz channel. >> >> >> >> How much capacity can I reliably push on a 20 MHz channel using >> > NStreme? > >> >> Other Gurus: >> >> I understand the following are loaded questions, but budget is around >> $1000-3000 range and the capacity needs to be around the 60Meg mark (30 >> each way or without a defined 1:1 guarantee, capability to flex and be >> able to push 30M each way). >> >> >> >> If I start upgrading to larger backhauls on busy links, what type of >> equipment should I look at? >> >> What can support VoIP? >> >> Anything that GPS times for frequency reuse? >> >> Anything work in the 5.4GHz range at a 12 mile distance? >> >> >> >> Eric Rogers >> >> Precision Data Solutions, LLC >> >> (317) 831-3000 x200 >> >> >> >> >> >> ----------------------------------------------------------------------- >> > - > >> -------- >> WISPA Wants You! 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Join today! >> 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/ >> >> >> >> ----------------------------------------------------------------------- >> > - > >> -------- >> WISPA Wants You! Join today! >> 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/ >> >> >> >> >> -- >> Jack Unger - President, Ask-Wi.Com, Inc. >> Author - "Deploying License-Free Wireless WANs" >> Serving the Broadband Wireless Industry Since 1993 >> www.ask-wi.com 818-227-4220 jun...@ask-wi.com >> >> Sent from my Pizzicato PluckString... >> >> >> >> >> >> ----------------------------------------------------------------------- >> > - > >> ------ >> >> >> >> >> >> > ---------------------------------------------------------------------- > >> ---------- >> WISPA Wants You! 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