How Does A T1 PRI Really Work

Here's a brief description of the difference between T1 voice vs PRI.....

PRI or Primary Rate Interface is a switched service delivered OVER a T1 connection . If someone were to say I want to order a PRI to location X.?What is being requested is a connection to a trunk side module capable of ISDN protocol to a Telco switch delivered to location X via a DS1 rate (T1) circuit.

Now if someone were to say I want to order a T1 to that SAME location X.??well?That wouldnt be enough info?A T1 from where to where? A T1 for what? By just asking for a T1, nothing is understood or implied about where or what the circuit would be used for. A T1 can be used to truck data at the rate of 1.544 Mbps from one location to another?With channel banks and appropriate DS0 level cards, a T1 can be used to truck up to 24 separate and distinct DS0 signals (analog data, analog voice, or Digital Data Service) from one location to another?A T1 can be used to connect one location to an ISP Internet Edge device to connect a customer to the World Wide Web?In other words, a T1 is a multi use pipe....

With a point to point T1 you can use it for voice and/or data depending on the equipment you have at each end. They are basically just providing the "Pipe" and it is up to you what it is used for.

The thing with T1's and PRI's is it all depends on what equipment is connected to it on each end.

As quoted above, a T1 is just a 24 channel circuit that can be used for multiple things. A PRI is a protocol that uses the 24th channel to control what the other 23 channels are used for.

In a nutshell - a T1 has 24 channels using 56K for data and 8K for signalling. A PRI has 24 channels and uses 23 for data and the 24th for signalling. Also you can break down the channels on a T1 for different type of service. On the PRI all 23 channels have to be the same.

The features.... or lack of.... totally depend on where the circuit is going and what it is connected to on the other end.

Keeping it on simple terms....

PRI is a diffrent protocol to be used with voice services over the T1 line. Where as a t1 line can also be used for voice but without using the PRI protocol and probably using diffrent equipment at the other end to get the dial tone....

Of course....there are a lot more technical details dealing with ISDN lines (PRI's/BRI's) but you've got the basic idea.

The simplest approach to finding the best solution is to request infrastructure design and rate quotes for PRI and/or T1 voice service.... comparing providers available in your area....using the free consultative support of: FreedomFire Communications. Getting expert consultation in this manner will save you time, effort, frustration....and money.

Michael is the owner of FreedomFire Communications....including DS3-Bandwidth.com and Business-VoIP-Solution.com. Michael also authors Broadband Nation where you're always welcome to drop in and catch up on the latest BroadBand news, tips, insights, and ramblings for the masses.

?gclid=cnbc2drehpmcfrsyewodxldqsw
Related Products Bg2
?gclid=cij325mdojmcfrsdewodvw15rq
?gclid=cin09c2hnpmcfqy3egodygneqw
Verifydevice T
?gclid=ckqzremtizmcfriaewodtvl8ua
Rss Title
?gclid=cklu47 Cnpmcfqmyewodysdrrg
?gclid=co3wgpy1mjmcfq01egodbtcwqq
?gclid=cn3skitqnzmcfq42egodzifmqg
?gclid=cjk Tmv8lzmcfrgxewodkibcsw
Join Events
Bottom01
?gclid=cmwi6e2lojmcfrcdewodfhojqq
?gclid=cjyqs8lslzmcfrazewodyq Ltw

What All Is Involved In Getting A T1 Line?

If you are a potential customer, don't even bother wondering what is behind the curtain. The telecom companies take care of the infrastructure, and you take care of the bill -- that's how it works. It doesn't matter if the "big tan telephone company cabinet" is involved or not -- you just want the service. Sure, it's interesting to know how stuff works, and it would be fun to drive by some box in the middle of some cornfield and know that your electrons are running through it, but it really doesn't matter, right? If the price is too high, you're not buying regardless of how the service is provisioned.

To answer the question, a T1 typically is nothing more than two copper pairs which are converted from analog to digital, with special conditioning (and signal repeaters if the distance requires them). If your location could get two additional regular phone lines, then you could probably get a T1 circuit without additional construction or trenching. If such additional work would be necessary, it's quite possible that you would not be charged for that work. In our industry, special construction costs are identified after the order is placed, and the customer can cancel the order with no penalty if the additional costs are not acceptable. It's not likely that construction costs can be identified prior to an order.

Most responsible internet providers will give you a dedicated internet connection at the full 1.5M speed. There are local "tier 2" providers that will purchase a certain bandwidth from an "upstream" provider, then resell it and oversell it. For instance, "Joe's Telecom" might buy a 45M DS-3 of internet access from AT&T. A DS-3 has enough bandwidth to support 28 T1 circuits. Joe will recognize that not every one of his customers will be using the full 1.5M at all times, so he will sell more than 28 T1 circuits -- this is overselling. So long as he watches his circuit utilization, and orders more bandwidth before the customers start crashing into each other, then all is well. But if he's like Comcast, and severely oversells, then customers' circuit performance will suffer. So you will want to know if your T1 circuit is dedicated access all the way to the internet backbone, or if it goes to Joe's concentrator where it is shared among his customers. If the service you get is from AT&T, Sprint, Verizon Business, Global Crossing, Qwest, Savvis, Internap, Level 3 and a few others, then you're dedicated. If it's from a local provider with a limited service area, it's probably shared bandwidth, and the pricing should be lower than from a dedicated provider. But....the quality defined by a Service Level Agreement (SLA) and QoS (Quality of Service) will also be lower.

Relative to a router, in your quote requests mention that you want "managed" service, which tells telecom companies that you want the T1 router to be included as part of their package. The T1 router is different than a typical "broadband" router one would get at a local electronics shop. T1 routers have built-in CSU/DSU functionality which assists in the synch up of the circuit. Some typical T1 routers are Cisco 1841 and Siemens 5940.

A free quote source highly recommended for fast, quality, personal service can be found at DS3-Bandwidth.com (they can assist with more than simple T1 if needed). Word of advice.....you must provide accurate contact information (installation address, email, phone number) and sufficient detail on your network requirements/application.....otherwise they'll ignore you as a bogus request. If you're serious take advantage of what they offer. If you're not serious.....go elsewhere.

Michael is the owner of FreedomFire Communications....including DS3-Bandwidth.com and Business-VoIP-Solution.com. Michael also authors Broadband Nation where you're always welcome to drop in and catch up on the latest BroadBand news, tips, insights, and ramblings for the masses.

?gclid=cnbc2drehpmcfrsyewodxldqsw
Related Products Bg2
?gclid=cij325mdojmcfrsdewodvw15rq
?gclid=cin09c2hnpmcfqy3egodygneqw
Verifydevice T
?gclid=ckqzremtizmcfriaewodtvl8ua
Rss Title
?gclid=cklu47 Cnpmcfqmyewodysdrrg
?gclid=co3wgpy1mjmcfq01egodbtcwqq
?gclid=cn3skitqnzmcfq42egodzifmqg
?gclid=cjk Tmv8lzmcfrgxewodkibcsw
Join Events
Bottom01
?gclid=cmwi6e2lojmcfrcdewodfhojqq
?gclid=cjyqs8lslzmcfrazewodyq Ltw