ISDN PRI refers to a telecommunication standard used for carrying multiple voice and data transmissions from one physical location to another. This standard is used in ISDN (Integrated Services Digital Network), a digital phone connection system developed for simultaneous transfers of voice, data, and video. PRI stands for Primary Rate Interface.

ISDN PRI is designed for industrial and large-scale users. It is suitable for corporations with several branches and manufacturing firms with a nationwide network. This is in contrast to ISDN BRI (Basic Rate Interface), a standard used in homes and smaller businesses.

What are the components that make up ISDN PRI? This standard consists of two channels: the B channel and the D channel. The B channel manages data transmission including voice. The D channel manages control and signaling of data transfer. In a T-1 configuration, a PRI is made of 23 B channels and a single 64 Kbps D channel. On the other hand, a PRI using an E1 line consists of 30 B Channels and one D channel.

A flexible bulk transfer is the main advantage of using ISDN PRI. This is because the 23 or 30 B channels can be used in several combinations to suit a specific data transfer need.

ISDN PRI is applied in numerous business processes. The most common of these is the telephone exchange between a phone company’s customer and the phone company’s main office. Communication is established between the two said entities and the data is sent and received by the customer’s phone through the telephone company. Voice and video can then be transmitted by the customer’s phone to the desired number.