EverythingT1.com
everythingt1.com
Offering T-1/T-3 information, glossary, FAQs, reference, Technical reports, news, messageboard, ISP lists and links.
SONET/SDH Technical Summary
techfest.com
Defines SONET and SDH, and provides references to appropriate standards organizations.
Committee T1
t1.org
Sponsored by the Alliance for Telecommunications Industry Solutions and accredited by ANSI for interoperability standards.
DCB's T1 Info
dcbnet.com
All you wanted to know about T1's but were afraid to ask.- T1 T-extender
dcbnet.com
DCB's T1 repeater for customer-owned cable. 
T-1 Carrier
webopedia.com
Webopedia definition and links about T1.
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