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Integrated T1 PRI

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PRI (Primary Rate Interface) is an ISDN connection designed to be provided over T1 lines. In the United States, a PRI line consists of 24 (64 kbps each) DS0 channels. PRI lines are commonly configured so that 23 channels serve as B (Bearer) channels and one as a D (delta) channel. Each B channel carries data, voice, and other services. (For more about integrated T1 PRI please click here)

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Unlike DSL and other broadband technologies that are limited to only densely populated areas, T1 service is available just about anywhere with a phone line. T1, also known as DS1, uses repeaters to boost up the signal strength of the transmission - allowing it to travel up to 50 miles away from the nearest Central Office location.

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Integrated T1 PRI Definition Continued.

The D channel carries control and signaling information for the B channels. B channels can be used as independent channels to simultaneously provide a variety of services such as data, voice, or imaging. They also have the flexibility to be bonded, as needed, to provide higher bandwidth for special needs such as video conferencing. A significant difference between PRI and traditional integrated T1 is that integrated T1 requires a portion of each channel to be allocated for signaling functions. This results in a reduction in effectiveness, efficiency, potential and bandwidth for most functions of each channel of traditional T1. With PRI, all signaling functions are provided by the 24th channel. This leaves each of the other 23 channels with a full 64 kbps which can be fully dedicated to bearer functions. One D channel can provide signaling functions for several other PRI lines. It is not uncommon for two D channels (one as primary, one for backup) to provide the signaling functions for a span of as many as 20 PRI lines. This frees the 24th channel of each of the other PRI lines so that they can be used as additional bearer channels. PRI provides many advantages over traditional T1. These include: dynamic channel allocation, call by call service selection, more PBX users can be supported, caller ID, messaging, and video conferencing. Because of increased efficiency provided by PRI, companies which switch to PRI from traditional T1 often find that they not only receive a much greater variety of services but often do not need to pay for as many trunks as they needed prior to the change. Integrated T1 PRI can come in many forms and variations, as mentioned above, but the most common integrated T1 PRI is a combination of PRI and data internet channels on one integrated T1 line. This service is very popular for small to medium companies which need all of the telephone functionality that PRI can offer, plus an extremely stable internet connection, but only have the budget for one T1 circuit. To obtain quotes for integrated T1 PRI, please try the pricing tool at the top of this page. It’s free, simple to use, and it provides comparative, real-time price quotes with no obligation. (Click here to return to top of page)

For details on any T1 related service, click on the service listed below.

T1 Data (Internet), an Introduction

Written by: Dennis Green - Nov 21, 2008

A T1 data line is a high speed, 1.54 megabits per second (Mbps), circuit which is comprised of 24 individual DS-O circuits. Each DS-O channel has a speed of 64 kilobits per second (Kbps). For perspective, your home telephone line is likely a DS-O line. T1 data lines are also at times referred to as DS1 circuits. T1 data is carried through two twisted pairs of copper wires. Virtually, all residences and businesses currently have two pairs of copper wires running to them. T1 lines are capable of delivering 1.54 Mbps simultaneously in both directions, one direction for each pair of copper lines. Because T1 data service is repeater driven (signal is digitally reestablished every 6000 feet), it is available several miles from telephone central offices. For this reason, T1 service can be available to virtually all of the businesses in the US. T1 lines are dedicated, in that they are always connected, and are also extremely stable. Most reputable providers include service level agreements which guarantee the reliability of the T1 lines they offer. Although the term T1 is commonly used when referring to a dedicated high bandwidth connection to the internet, T1 circuits can transfer data in many forms to accomplish a variety of functions. These include: fractional t1 (commonly 128 Kbps to 756 Kbps), burstable (less expensive for companies which normally do not need a full DS1/T1), integrated T1 (one T1 line comprised of any combination the types of DS1/T1 listed here), channelized DS1 (one form of integrated T1), point-to-point (direct and constant DS1 connection between to locations), dynamic integrated (a more state-of-the-art alternative to channelized integrated), local (local phone service), PRI, MPLS (multiprotocol label switching), and frame relay. Each of these types of DS1/T1 has advantages over the others, depending on the specific needs of your company. Also, the availability of each is based on the offerings of each T1 provider and the geographic location. As the authorized sales agent for the top 20 T1 providers in the country, we are able to provide real-time availability and comparative price quotes for any address in the country. To check availability and prices for your business, just complete the short form at the top of this page. It’s free, simple to use and there is no obligation. If you already have T1 related services, use this form to compare what you are currently paying. You may find that you are paying far too much for your existing service. (Click here to return to top of page)