Digital_Hierarchy

	Committee T1 : Sponsored by the Alliance for Telecommunications Industry Solutions and accredited by ANSI for interoperability standards. - www.t1.org/
	EverythingT1.com : Offering T-1/T-3 information, glossary, FAQs, reference, Technical reports, news, messageboard, ISP lists and links. - www.everythingt1.com/
	Network and Services Integration Forum : Provides an open industry forum for the discussion and resolution of multiple technology integration and SONET interoperability issues. - www.atis.org/atis/sif/sifhom.htm
	SONET/SDH Technical Summary : Defines SONET and SDH, and provides references to appropriate standards organizations. - www.techfest.com/networking/wan/sonet.htm
	T-1 Carrier : Webopedia definition and links about T1. - webopedia.com/TERM/T/T_1_carrier.html
	T1 T-extender : DCB's T1 repeater for customer-owned cable. - www.dcbnet.com/datasheet/textds.html