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(LA Times)   911 what's your emergenc**Connection reset by peer**   (latimes.com) divider line 4
    More: Scary, VoIP, connectedness, denial-of-service attack, IP phone, emergency operations center, caller ID, independent sources, Internet Crime Complaint Center  
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9014 clicks; posted to Main » on 19 Jul 2013 at 10:23 AM (1 year ago)   |  Favorite    |   share:  Share on Twitter share via Email Share on Facebook   more»



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TWX
2013-07-19 10:30:57 AM  
2 votes:
It all depends on how the network administrator configures the network, and where the use of IP comes in to play.

If the service connect from the telephone company is on a private network rather than the Internet, and if it separately routes into the existing organization's network, and if the network engineers have QoSed the network to give proper priority to IP telephony, then it shouldn't really be too much of a problem.

If they use the same connection to the world that their public face on the Internet uses and just route the traffic in, or if their gateway information to the public Internet is made known, then certainly there's room for problems.

There are all sorts of other issues with IP telephony, so this is fairly low on my list. I'm much more worried about power outages taking down telecom closets and the switches needed to run the phones, so suddenly in a power outage one cannot call emergency services. a POTS line or an internal phone system that works like a POTS line where the entire building's phone system runs off of a single battery bank or generator reduces the number of points of failure and increases overall reliability. Copper ethernet is limited to 300' lengths, so one has to have telecom closets for local distribution, while regular telephones can go thousands of feet over copper, allowing all cables to run back to one central location in a building or campus.
2013-07-19 12:18:25 PM  
1 votes:
IANATE but w.r.t. POTS, isn't it likely that in the coming years that VOIP ends up being used by the Telco upstream of your POT, negating the benefits of POTS?

A few years ago a large windstorm took out power to my town for about a week. Internet was out immediately and eventually we lost cell service as well. Somehow I survived. The only threat was boredom, really. Now I have a generator so I would be able to watch movies and play xbox (aka the essentials of life).
TWX
2013-07-19 11:07:45 AM  
1 votes:

UsikFark: Do you know why ethernet is "limited" to three hundred feet? Hint: it's not.


Ever try getting a gigabit over Cat5e connection to reliably work in excess of 350'? It probably won't...

We routinely connect users at 600' over 10BaseT because some idiot years ago didn't follow the spec and ran cables that long. We sometimes get 100BaseTX to come up at 400', but it generally doesn't work over longer distances. Gigabit really struggles over 350'. Even gigabit over single-mode OM1 fiber has issues over 1000' and requires mode-conditioning cables and LX transceivers to make it work.

That standard, as annoyingly limited as it is, seems to be there for a reason.
TWX
2013-07-19 10:46:43 AM  
1 votes:

Molavian: Shut up, bellhead.  It's not 1980 anymore.


*laugh*

In my opinion, real landline telephone advances from a caller's perspective stopped in the sixties with the introduction of pushbutton dialing and the cordless handset. One picks up the phone, presses some buttons, and if someone picks up at the other end, gets to talk to them. That's about it. It shouldn't matter to the user how their conversation gets from their handset to the other party's handset, over a copper pair, over a trunk cable, over T1, over OC3, or over metro optical ethernet, or over cablemodem VOIP. Doesn't matter.
 
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