What is PRI? Is there any difference between PRI and E1?

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"PRI" stands for Primary Rate Interface, and is a level of service in the Integrated Services Digital Network (ISDN) intended for large users. The link above should provide you with a better understanding of the term.

E1 (or E-1) is a digital transmission format. It's the European equivalent of the North American T-carrier system format. The E1 is the line used to deliver PRI. To learn more about E1, see our definition of E-carrier system.

This was first published in January 2007

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