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LATA NPA NXX

Hi,

What is LATA, NPA, and NXX ?

what's the difference from one another?

Thanks.
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lynnton
Asked:
lynnton
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1 Solution
 
Dr-IPCommented:
LATA = Local Access and Transport Area

NPA = Three-digit Numbering Plan Area code

NXX = Three-digit Central Office Code, i.e. telephone exchange number

NPA-NXX-XXXX

The LATA is a geographic service area, the legal description of a LATA is a geographical area within which a divested Regional Bell operating company (RBOC) is permitted to offer exchange telecommunications and exchange access services. In a way you can think of LATA’s as being how states carve up states sections of the state for telephone companies. Some states have a single LATA, but most have several. In the old days they defined zones where the local phone companies could offer local and local long distance. IE calls between two area codes that are not local calls but reside in the same LATA. These days since local phone companies are allowed to do national and international long distance this descriptor of a LATA is pretty moot. So you can think of a LATA now as basically the territory of a regional phone company as defined by law.      

The NPA is the area code for the called area. The NXX is the local exchange number; the NXX in the phone number 000-NXX-0000, which used to designate what local office provided the switching. These days with portable numbers knowing the NXX no longer tells where the call really is switched, so it’s not as clear cut as it used to be, so just think of it as the three digits of a phone number after the area code.  
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lynntonAuthor Commented:
Dr-IP,

Does this mean LATA is a agreement between telephone companies?
If you could site a sample how LATA works..

Clear and consice on NPA-NXX

Thanks.
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lynntonAuthor Commented:
Dr-IP,

I forgot to ask regarding DNIS, hope you could enlighten me.

Thanks.
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Dr-IPCommented:
The phone companies have some input on LATA’s, but state and federal laws heavily control them since whom ever is assigned a LATA basically has a regulated monopoly for local phone service in that LATA. So most of them where created by law, and assigned to phone companies by various means. I doubt you will ever see the current LATA’s change much from their current state, as any move to redefine them would cause an uproar in the telecom industry by those who currently control them, and those who would die to get their hands on them.      

DNIS = Dialed Number Identification Service, the called parties phone number.
ANI = Automatic Number Identification, the calling parties phone number.

When you call someone as your phone call is routed though the phone system, the ANI and DINIS are carried in the routing information to help setup the call along the way. This becomes particularly important in complex phone networks where the call may need to be set up on a dozen or more switches, and where there are multiple paths between the destinations. This is also so they know who to bill the call to, and where the call was placed too.      

http://www.atis.org/tg2k/t1g2k.html
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lynntonAuthor Commented:
Dr-IP,

Very clear and consice, is it okay if ask another question? since you're really good at clearning the dark clouds in my head.

Thanks.
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Dr-IPCommented:
Ask away if I can answer it I will, and if not someone probably will.
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lynntonAuthor Commented:
Dr-IP,

What is frame-relay? when you order a circuit on your telephone provider do you need to tell them you want frame-relay?
or frame-relay is on the router side, where in you tell the router to do frame-relay and on the other end too.

i''m kinda confuse on frame-relay. is it being used on any media? does IP uses this?

-frame relay a packet switching protocol, this means it's on the router that initiate the frame relay?

Thanks.
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Dr-IPCommented:
Frame really is a wide area data networking protocol that runs across Telco circuits. It was designed to be a less expensive option than using point to point Telco circuits for companies that needed data links between offices since the long haul links can be shared. If you order a frame relay T1 from your Telco it will be connected to the frame relay network, which can then connect to other routers attached to the frame relay network that it is programmed to allow you access to. On top of frame relay you can run other network protocols, or should I really say encapsulated within the frames of frame relay. Such as IP, IPX, and so on.          

http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/frame.htm
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