Data Communications Digital Hierarchy
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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. Help build the largest human-edited directory on the web.