What is PRI? Is there any difference between PRI and E1?
"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 last published in January 2007
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