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

    Requires Free Membership to View

    By submitting your registration information to SearchNetworking.com you agree to receive email communications from TechTarget and TechTarget partners. We encourage you to read our Privacy Policy which contains important disclosures about how we collect and use your registration and other information. If you reside outside of the United States, by submitting this registration information you consent to having your personal data transferred to and processed in the United States. Your use of SearchNetworking.com is governed by our Terms of Use. You may contact us at webmaster@TechTarget.com.

"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