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T3 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. The D channel carries control and signaling information for the B channels. (For more about T3 PRI, please click here)

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Coverage Area

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.

We have T3 PRI in the following Hamilton County, Florida Cities :

Jasper T3 PRI
Jennings T3 PRI
White Springs T3 PRI
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T3 PRI Definition Continued.

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 T1 is that non PRI 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. 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 the remaining 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. A T3 is a 45 mbps (megabits per second) circuit. T3 is the equivalent of 28 T1s. When the DSOs of a single T1 or T3 are specifically configured and combined to provide different functions such as PRI, voice, internet data, video conferencing, audio conferencing or video broadcasting, this is referred to as channelization. A channelized T3 can perform all of the above functions, and more, without the added expense of needing to combine T1s for each function, or needing to acquire separate T3s or fractional T3s for each function. Because a DS0 is a very small component of a T3, channel assignments can be extremely granular and specialized. DS0s within a T3 can be combined in any number to allow extremely precise function assignments. Channelization makes T3 an extremely versatile and adaptable service. As an example, virtually any combination channels within a T3 can be configured for PRI. PRI is predominantly carried over T1 lines, or grouped T1s, but occasionally, in heavy usage situations, T3s are configured to carry PRI. (Click here to return to top of page)

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Is MPLS Causing Frame Relay to be Obsolete?

Written by: Dennis Green - Jan 8, 2009

MPLS (multiprotocol label switching), is only one of many factors that are resulting in a diminishment of demand for frame relay. Other factors include the lower cost of clear channel T1, increased demand for; VOIP (Voice over Internet Protocol), video conferencing, class of service (CoS), and a tendency toward converged services on one large pipe. At one time, and for many years, frame relay was considered the state-of-the-art broadband technology. This time has now passed. Many substantial businesses continue to rely on frame for their bandwidth and networking needs, but in most cases, this has more to do with procrastination and a lack of understanding about just how easy, and cost effective it would be to switch to a fully managed, any-to-any location network based on MPLS technology. In the not to distant future, virtually all companies will switch from frame, to MPLS based networks. To make this change now is virtually free. Installation is commonly free, the routers, and configuration of routers is often free, the cost of MPLS bandwidth is usually far lower than bandwidth provided with frame relay, and the speed of bandwidth provided with MPLS is often far higher than the much smaller circuits utilized with frame for the same cost. MPLS networks are often completely managed by telecom providers, thus lowering customer costs for networking staff and reducing the workload of often overworked IT personnel. MPLS has far more abilities than frame. For example, with MPLS, many applications can be provided over one circuit simultaneously. This eliminates the need for individual circuits for each application. With MPLS, the need for a multitude of permanent virtual circuits (PVCs) needed to connect various network locations is eliminated. MPLS based networks provide any-to-any network location connectivity without the need for a myriad of PVCs required with frame. MPLS easily facilitates routine data transfer, VOIP, and video conferencing simultaneously with application prioritization. This prioritization, accomplished with CoS, prevents routine data transfer from interfering with higher priority applications such as VoIP and video conferencing utilizing the same circuit.