ISDN Tutorial

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http://www.ziplink.net/~ralphb/ISDN/

For an introduction to ISDN, including pictures, visit this site. The information is organized in ten pages, including topics on history of ISDN, its advantages, layer protocols, and sources and references. It also includes an ISDN "book store" link to a page that lists some of the third-party reference books available on ISDN.