ISDN
Links
isdnshop.com
http://www.isdnshop.com/isdn-basics.html
isdnshop.com - ISDN 101 - An Introductory Survey of ISDN.
qwest.com
http://www.qwest.com/products/data/isdn/isdn_faq.html
qwest.com - Integrated Services Digital Network FAQs.
http://www.isdnshop.com/isdn-basics.html
http://www.qwest.com/products/data/isdn/isdn_faq.html