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A DS1 line (commonly referred to as T1 line) is a high speed 1.54 megabits per second (Mbps) circuit which is comprised of 24 individual DS-O circuits. Each DS-O circuit has a speed of 64 kilobits per second (Kbps). For perspective, your home telephone line is likely a DS-O line. (For more about DS1 line 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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DS1 Line Definition Continued.

DS1 lines are carried through two twisted pairs of copper wires. Virtually, all residences and businesses currently have two pairs of copper wires running to them. DS1 lines are capable of delivering 1.54 Mbps simultaneously in both directions, one direction for each pair of copper lines. Because DS1 service is repeater driven (signal is digitally reestablished about every 6000 feet), it is available several miles from telephone central offices. For this reason, DS1 can be available to virtually all businesses in the US. DS1 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 DS1s they offer. Although, each DS1 circuit has traditionally been capable of providing a maximum 24 phone lines, due to advancement in coding techniques, some are now capable of supplying up to 36 phone lines. There are several types of DS1. These include: full DS1 (1.54 Mbps), fractional (commonly 128 Kbps to 756 Kbps), burstable (less expensive for companies which normally do not need a full DS1, but at times due to peak work loads, need to burst to full DS1 bandwidth), integrated (one DS1 line comprised of any combination the types of DS1 listed here), channelized DS1 (a type of integrated DS1), point-to-point (direct and constant DS1 connection between to locations), data (internet), voice (telephone), local (local phone service), pri (voice service which includes many added features such as caller ID), and frame relay (bandwidth from a shared network). Each of these types of DS1 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 DS1 provider and the geographic location. To check availability and comparative pricing in real-time for your business, please use the pricing tool at the top of this page. (Click here to return to top of page)

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

Is PRI the Right Choice for Your Company?

Written by: Dennis Green - Jan 8, 2009

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 T1 lines are commonly configured so that 23 channels serve as B (Bearer) channels and one as a D (delta) channel. Each B channel serves as a voice (telephone) channel. The D channel provides 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 internet, 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 T1 and traditional integrated T1 is that T1s which are not PRI require 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 non-PRI T1. With T1 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 T1 lines. This frees the 24th channel of each of the other PRI lines so that they can be used as additional bearer channels. Because PRI lines serve as a direct connection to the telephone company’s central office, PRI is often the preferred choice of PBX customers. PRI T1 provides many advantages over traditional voice T1. These include: call by call service selection, more PBX users can be supported, caller ID, DID (direct inward dial) numbers, messaging, and video conferencing. Because of increased efficiency provided by PRI, companies which switch to PRI from traditional voice 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. PRI T1 is available in most major metropolitan areas, but is not available in most isolated rural areas. To assess availability and pricing for your location, use the tool at the top of this page or on our home page. This tool will provide real-time answers, it’s free, easy to use, and there is no obligation. (Click here to return to top of page)