There is no system that is fool proof or infallible. I deal with RF links that fail all the time in major cities across the country. Lets consider how many dispatch centers are moving to remote dispatch or even using IP based systems. I know that Woodbury county Iowa just upgraded their system to a nice beautiful IP based system.
Any one who considers doing so is actually on cutting edge grounds. Lets also consider that in order for the system to work at home, there do have to be safe guards in place to protect system integrity, so the excuse of being robbed or loss of power is a joke, there are redundant systems to assist in this area. Thegreatest risk I see actually is employee quits or is terminated and then the cost of system removal and re-install at a new location. However if a smaller dedicated building is used to supplement the dispatch center then this can be a controlled access point and easily maintainable. I am sure the OP has no intention of just contacting the local ISP and requesting a residential account for Life/safety applications. To get a back haul and secure line is not difficult. I do it all the time for major agencies, mostly over Vsat but none the less an IP based system. I am about to donate this keyboard to the roadway out front,the damn spacebar is givingupon me On Mon, Jan 4, 2010 at 6:08 PM, Don E. Wisdom <[email protected]>wrote: > > > try again. I am a network engineer and I can tell you all it takes is one > mistake or routing loop extended power failure etc and your down for a > while. Anyone who would even think about doing this over the internet needs > their head checked. Ask yourself this question... If your power goes out at > home & you have comcast digital voice (that goes over the cable modem) and > someone robs your house.. What does your alarm do? Nothing! it cant call out > because the power is out. VoIP is not a technology that anyone should be > relying on for LIFE SAFETY things. > > the standard SLA on a T1 connection is 4 hours. (and it should be since it > costs $4-500/month) realistically they aren't going to fix it until they're > 4 hours are up. Home/business DSL connections typically have no SLA or it > isn't worth the toilet paper it is printed upon. Its been proven multiple > times in the last year (san francisco fiber cut, deep sea fiber cuts, turkey > stealing youtube's ip space etc) that the internet is not 190% reliable. You > have to remember that you may have a competent admin but you are just as > vulnerable if someone else does not have one. > One other thing.. 99.99% of VoIP applications use UDP which is a > connectionless protocol. meaning that the side sending it has no clue if it > got there. Simply put it either gets there or doesn't and you have no idea > which. > > This is a bad bad bad bad bad bad bad bad bad idea. No insurance company in > their right mind will touch this. I'd heard that the NFPA is also looking at > banning VoIP's use for fire alarm systems. > > --Don > > > On Jan 4, 2010, at 4:47 PM, Jed Barton wrote: > > > exactly what i thought. > > People can say relyability, but your internet connection is probably a > hell > > of a lot more relyable than a typical verizon phone line. > > > > -----Original Message----- > > From: [email protected]<Repeater-Builder%40yahoogroups.com> > > [mailto:[email protected]<Repeater-Builder%40yahoogroups.com>] > On Behalf Of Barry > > Sent: Monday, January 04, 2010 6:43 PM > > To: [email protected]<repeater-builder%40yahoogroups.com> > > Subject: RE: [Repeater-Builder] dispatch centers run through the internet > > > > > > > > It's done very day ,a good vpn and intranet and very difficult to > > interfere, with short of a direct physical connection there is little > better > > so I don't understand all the fuss . Some one posted a good remote radio > > controller so the rest is down to the skills of the system admin B ( and > > yes I have had training in the area) > > > > > > ________________________________ > > > > To: [email protected]<Repeater-Builder%40yahoogroups.com> > > From: [email protected] <rross%40librtynet.com> > > Date: Mon, 4 Jan 2010 16:24:08 -0700 > > Subject: RE: [Repeater-Builder] dispatch centers run through the internet > > > > > > > > > > Given the inherit instability of the internet (it was NEVER designed to > do > > what we are doing with it), I would consider any communications system > which > > is reliant upon the internet to be flawed by design and completely > > untrustworthy. > > > > > > > > My two cents worth. > > > > > > > > From: [email protected]<Repeater-Builder%40yahoogroups.com> > > [mailto:[email protected]<Repeater-Builder%40yahoogroups.com>] > On Behalf Of WA3GIN > > Sent: Monday, January 04, 2010 6:23 PM > > To: [email protected]<Repeater-Builder%40yahoogroups.com> > > Subject: Re: [Repeater-Builder] dispatch centers run through the internet > > > > > > > > > > > > Yes, and they are called Intranets. > > > > > > > > ----- Original Message ----- > > > > From: Kevin Custer <mailto:[email protected] <kuggie%40kuggie.com>> > > > > To: [email protected]<Repeater-Builder%40yahoogroups.com> > > <mailto:[email protected]<Repeater-Builder%40yahoogroups.com>> > > > > > Sent: Monday, January 04, 2010 5:55 PM > > > > Subject: Re: [Repeater-Builder] dispatch centers run through the > > internet > > > > > > > > > > > > The Internet is a shared medium. A private WAN/LAN commonly utilizes > > > > fiber optic cable or licensed wireless networking to accomplish > > connectivity. While private systems can deliver Internet, it is not > > (necessarily) THE Internet. Privately owned facilities like what > > many > > CATV, Phone, Internet, and combinations of them can have dark fiber > > or > > reserved virtual space that cannot get clogged with Internet > > overhead. > > The bottlenecking you might experience with facilities you cannot > > (do > > not) control can (will) be the downfall of such a system - unless a > > SLA > > can be gotten. A SLA is a service level agreement in which a company > > > > guarantees connectivity - to some degree. The more reliability the > > agreement extends - the higher the cost. > > > > Kevin Custer > > > > > Jed Barton wrote: > > > tell me about this system a little bit. > > > > > > > > > You'll note that the manufacturer is not suggesting that you > > utilize the > > > Internet for this device. It is marketed for use on a private > > LAN/WAN. > > > > > > Chuck > > > WB2EDV > > > > > > > > > > ________________________________ > > > > Meet singles at ninemsn dating Looking for a great date? > > <http://clk.atdmt.com/NMN/go/150855801/direct/01/> > > > > > > > > > > > > ------------------------------------ > > > > > > > > Yahoo! Groups Links > > > > > > > > >
