An ISDN PRI is a standard which is used for transporting multiple data and voice transmissions between a source point and the receiving end. ISDN stands for Integrated Services Digital Network, while PRI stands for Primary Rate Interface.

There are two different types of interfaces involved with ISDN. There is the primary integrated services type, and then there is the Basic Rate Interface, which is also known as a BRI. A basic rate interface is used to cater to homes and smaller sized enterprises and businesses.

Between the two different interfaces, there are a different number of channels. There are B channels, and there are also what are known as D channels. The B channel, which is also known as the Bearer Channel, is used for transmitting data. This type of data may consist of voice data, for example. The D channel is used for signaling and control of the transmission. These channels combined make up the total PRI. In T-1 configurations, the PRI is made up of 23 B channels and only one D channel, which is 64 KBps. In E1 lines, it instead uses 30 B channels and again 1 D channel.

The T-1 system is widely used in areas such as the US, Canada, and Japan. However, in some places such as Europe and Australia, the E1 carrier system is more popular. North America and Japan can be said to be represented by the 23B+D system, with a total bit rate of 1.544 Mbs, which is what T1 was more specifically. European countries and Australia are represented by the bit rate of 2.048 Mbs, which is what E1 is more specifically.

A ISDN PRI is used when establishing a connection between a PBX and a central office of any particular telephone company.  It may also be used to connect to an IXC (Inter Exchange Carrier), which is basically just a long distance telephone company. A ISDN PRI has an advantage in that it can be used to combine certain data in it’s transmissions, which allows for more data transfer to be achieved overall.

What is a PBX?

PBX (private branch exchange) is a telephone exchange that serves just one company. This is a cheaper alternative to leasing a bunch of telephone lines from any one telephone company. PBXs, through the use of trunks, make connections through internal lines that are connected to each individual phone. The employees can then pick up the phone, and through the use of the PBX, make outside calls after dialing the outside access code.

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