T-1 lines are a popular leased line option for businesses connecting to the Internet and for Internet Service Providers (ISPs) connecting to the Internet backbone. The Internet backbone itself consists of faster T-3 connections.

T-1 lines are sometimes referred to as DS1 lines.

Committee T1 home page
Committee T1 develops technical standards and reports regarding interconnection and interoperability of telecommunications networks at interfaces with end-user systems, carriers, information and enhanced-service providers, and customer premises equipment (CPE). Their home page provides links to organizational information, reports, standards, affiliations, FAQs, and press releases.

Everything T-1
A comprehensive site offering T-1/T-3 information, glossary, FAQ's, Books, Reference, Technical Reports, News, T-1 Request Forms, Messageboard, ISP Lists, Links and more.

T-1 Technology Discussion
Article describing T-1 carriers and how they operate. This page is hosted by Data Comm for Business, Inc.