ISDN BRI is a ISDN standard service which is used to cater to homes and smaller sized enterprises and businesses. ISDN stands for Integrated Services Digital Network, and the BRI part os the word stands for Basic Rate Interface.

There are two different types of interfaces involved with ISDN (Integrated Services Digital Network), which is what BRI is associated with. There is the basic rate interface type, and then there is the Primary Rate Interface, which is also known as a PRI. A PRI is used for transporting multiple data and voice transmissions at a higher bandwidth than what a BRI promotes.

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 BRI. The BRI consists of two B channels that operate at 64 Kbps and one D channel that operates at 16 Kbps. Because of this, BRI is sometimes referenced to as 2B+D. The two B channels combined can provide for a data transfer rate of up to a hearty 128 Kbps.

Because the BRI channels can provide two separate 64 Kbps channels, they are used to simultaneously receive different types of data. This can be voice, video, or some other type of data. No channel goes unused in the configuration it is set up to utilize.

The PRI is a bit different in comparison to the BRI. PRI is used in both T-1 connections and E1 connections, which both operate at high bandwiths. 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.

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