Don, You have pointed out some valid concerns but the world doesn't care...VOIP is cost effective for day to day operations and everyone is going there as fast as they can...the fact that everyone is going there will bring the reliability you indicate is needed, before too long. Just remember the telcos weren't that reliable for decades...but the world is changing and there ain't muc we can do about it except trying to bring the best ideas and concepts to the planning meetings to ensure as best we can that these networks have adequate redundancy, cyber security, etc.
Best, dave wa3gin ----- Original Message ----- From: Bill Smith To: [email protected] Sent: Monday, January 04, 2010 7:20 PM Subject: Re: [Repeater-Builder] dispatch centers run through the internet VoIP is used daily and has been for over five years for mission-critical applications such major electric and gas utilities and public safety. VoIP isn't the problem, it's the transport medium. Bill --- On Mon, 1/4/10, Don E. Wisdom <[email protected]> wrote: From: Don E. Wisdom <[email protected]> Subject: Re: [Repeater-Builder] dispatch centers run through the internet To: "[email protected]" <[email protected]> Date: Monday, January 4, 2010, 6:08 PM 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] > [mailto:[email protected]] On Behalf Of Barry > Sent: Monday, January 04, 2010 6:43 PM > To: [email protected] > 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] > From: [email protected] > 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] > [mailto:[email protected]] On Behalf Of WA3GIN > Sent: Monday, January 04, 2010 6:23 PM > To: [email protected] > Subject: Re: [Repeater-Builder] dispatch centers run through the internet > > > > > > Yes, and they are called Intranets. > > > > ----- Original Message ----- > > From: Kevin Custer <mailto:[email protected]> > > To: [email protected] > <mailto:[email protected]> > > 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 > > > ------------------------------------ Yahoo! Groups Links
