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Committee T1 - - Sponsored by the Alliance for Telecommunications Industry Solutions and accredited by ANSI for interoperability standards.

DCB's T1 Info - - All you wanted to know about T1's but were afraid to ask.

EverythingT1.com - - Offering T-1/T-3 information, glossary, FAQs, reference, Technical reports, news, messageboard, ISP lists and links.

SONET/SDH Technical Summary - - Defines SONET and SDH, and provides references to appropriate standards organizations.

T-1 Carrier - - Webopedia definition and links about T1.

T1 T-extender - - DCB's T1 repeater for customer-owned cable.