I would guess just one AP on the water tower of Town Hall. The place is all flat, no tall buildings but lots of residential with trees.
If he could drive, say, faster than 299,792,458 miles per second, he could probably drive back to the station and answer his own radio call. In that case the 4.9 wouldn't be any good. But it's theory at this point since my light speed sled is in the shop for a trany rebuild. But being a small town cop, they usually just sit in the parking lots on the edge of town hoping for speeders. They have, I think, only 2 cars, donated by the state as they replaced them with newer ones. They have no dispatcher, that's handled by the sheriff's department. They can get the same info over the radio but I think he wants to see the actually picture of the drivers license and to be able to see more detailed information of the person he has stopped for driving 39 in a 35mph zone. ( I lost on that one, after all it IS technically speeding, said the judge.... Sigh) So I see value in what he is trying to do. But I doubt he'll be moving around much while using it, just parked in a lot looking at porn or behind a car running the plates. I kid but I have respect for these guys. Well, most of them anyhow! I certainly don't want to pull people over at night because they have a parking light out. That's lawlessness I don't need to see. -----Original Message----- From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Scott Carullo Sent: Saturday, October 17, 2009 2:57 PM To: WISPA General List Subject: Re: [WISPA] Ideas on Police Department Wireless Link from StationtoCruiser You must think the wireless carriers defy physics is you don't believe you can deploy any solution yourself that can't go over 30MPH. Why would your 4.9 not work over 30MPH. Put one good set of equipment on a tall tower with no noise and you are home free. Actually I'd put two sets on the tower for redundancy but you get the picture. Of course, it does depend on the environment as far as mountains, tunnels, forests, large tall buildings etc - I have no idea on the area I'm just suggesting it as an option to have unless it doesn't work - for some other reason that it can go 30MPH lol I promise it looks like the car is motionless then the radio wave travels near speed of light. Scott Carullo Brevard Wireless 321-205-1100 x102 -------- Original Message -------- > From: "3-dB Networks" <wi...@3-db.net> > Sent: Saturday, October 17, 2009 2:39 PM > To: "WISPA General List" <wireless@wispa.org> > Subject: Re: [WISPA] Ideas on Police Department Wireless Link from StationtoCruiser > > Not for mobility it won't. 4.9GHz is great for point to point or point to > multipoint... but if you want mobility... your back to a 4.9GHz mesh to make > it work reliably. > > There is an alvarion 900MHz system that alvarion claims will work from one > tower in a situation like this... but without having touched it I won't > recommend it :-D > > It probably comes down to two things: > > 1) What are the throughput requirements > 2) Is mobility required (mobility meaning driving around the city and > staying connected) > > Either way... the most cost effective solution (especially if there is only > one or two cars on the force) is going to be utilizing some sort of 3G > service. Mesh networks (and I should specify, Mesh networks designed with > high speed mobility in mind... some sort of proprietary protocol has to be > used for the switching) are going to provide the best coverage at high > speeds with the highest throughput... along with giving the city a network > it controls. > > If mobility isn't required... you could do more of a hotspot type > solution... or a high gain omni on the car with some high gain omni's on the > towers... but there would be no guarantee of reliable service everywhere... > > Robert... no matter what make sure before you do anything that the > expectations are clear, and that you have a contract written. If the city > doesn't like the way the network performs, you could have a serious lawsuit > on your hands (since it is a public safety application). > > Daniel White > 3-dB Networks > http://www.3dbnetworks.com > > > >-----Original Message----- > >From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On > >Behalf Of Scott Carullo > >Sent: Saturday, October 17, 2009 12:23 PM > >To: WISPA General List > >Subject: Re: [WISPA] Ideas on Police Department Wireless Link from > >Station toCruiser > > > > > >I myself would look into 4.9 or other licensed spectrum. Then you could > >have gear on one tower and service the whole area... > > > >Scott Carullo > >Brevard Wireless > >321-205-1100 x102 > >-------- Original Message -------- > >> From: "3-dB Networks" <wi...@3-db.net> > >> Sent: Saturday, October 17, 2009 1:46 PM > >> To: "WISPA General List" <wireless@wispa.org> > >> Subject: Re: [WISPA] Ideas on Police Department Wireless Link from > >Station toCruiser > >> > >> IMHO, the only way to do something like this where the office is > >mobile > >is > >> with cellular service (although he will need to VPN back to the Police > >HQ) > >> or to use a Mesh network designed for mobility (since 802.11G tends to > >fall > >> apart past 30MPH or so). > >> > >> Unless this city want's to make a major investment in Mesh... I'd tell > >him > >> to stick with the cellular air cards (Verizon, AT&T, whatever) and be > >done > >> with it. Hacking together a solution is probably more effort than its > >> worth, and there could be theoretical consequences if the network > >doesn't > >> operate correctly. > >> > >> I'm still nowhere close to being able to offload this... but down the > >pipe I > >> know of a city that is replacing their MOTOMESH Solo network with > >MOTOMESH > >> Duo... so those nodes would probably be cheap... and it allows the cop > >cards > >> to go up to 144MPH in the Mesh and still stay connected (its actually > >really > >> cool technology developed for the US Military... but the most it can > >do > >is > >> T1 speeds) > >> > >> Daniel White > >> 3-dB Networks > >> http://www.3dbnetworks.com > >> > >> > >> >-----Original Message----- > >> >From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] > >On > >> >Behalf Of Robert West > >> >Sent: Saturday, October 17, 2009 9:05 AM > >> >To: WISPA General List > >> >Subject: [WISPA] Ideas on Police Department Wireless Link from > >Station > >> >to Cruiser > >> > > >> >I got a call Friday afternoon from the police chief of a small little > >> >spot > >> >in the road asking about the possibility of connecting his cruisers > >to > >> >the > >> >station network via a wireless link. (He is the "Police Chief" but I > >> >suspect he is also the entire police force) He said that the local > >Wal- > >> >Mart > >> >has agreed to donate to him a few of those little Acer 7" screen > >> >laptops, > >> >which are a big piece of crap from the number of repairs we've had to > >do > >> >on > >> >them... Anyhow, he wants to be able to be in the cruiser and connect > >to > >> >the > >> >network back at the station and use the websites from the Attorney > >> >General's > >> >office where he can run plates, drivers license info and also fill > >out > >> >his > >> >reports. > >> > > >> > > >> > > >> >Here's the setup.. > >> > > >> > > >> > > >> >This Burg is a bit less than 2 miles long and about one and a half > >miles > >> >wide. The town hall is equivalent to a 4 story building and they > >also > >> >have > >> >a water tower that looks to be 100 foot tall. The terrain is flat as > >> >can be > >> >and they have the normal scattering of trees. The Town Hall and > >water > >> >tower > >> >are the tallest structures by far aside from a large grain elevator > >> >right > >> >outside of town. Boy wants to connect to his network anywhere in > >town > >> >from > >> >his cop-mobile as well as when he is at home, also within the town. > >> > > >> > > >> > > >> >We've done plenty of private networks but it's all been in the 2.4 > >and > >> >5ghz > >> >band. He was thinking he could just throw up a 2.4ghz link and be > >good > >> >but > >> >I told him to hold on, I didn't think he could broadcast the Attorney > >> >Generals network to every antenna in town, I had to do some research. > >> >So > >> >this, because of my utterly blatant laziness, is my research. J > >> > > >> > > >> > > >> >Has anyone been down this path? What can we do and not do? > >> > > >> > > >> > > >> >I have a meeting with the guy next Wednesday and want to have some > >idea > >> >of > >> >what we're up against on this one. (Hopefully he doesn't recognize > >me > >> >as > >> >the guy who took him to court over a ticket he wrote for a crooked > >> >license > >> >plate... I won that one by the way) > >> > > >> > > >> > > >> >Thanks for any help! > >> > > >> > > >> > > >> >Robert West > >> > > >> >Just Micro Digital Services Inc. > >> > > >> >740-335-7020 > >> > > >> > > >> > > >> > > >> > > >> > >>----------------------------------------------------------------------- > >- > >> >-------- > >> >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/ > >> > >> > >> > >> > >------------------------------------------------------------------------ > >---- > >---- > >> WISPA Wants You! 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