ISDN Protocols. Learn about ISDN B and D Channels, difference between PRI T1 & PRI E1 ISDN lines, plus T and E Carriers, Digital Subscriber levels (DS0, DS1, DS2, DS3) and much more. Finally, we'll take a look at the PPP - Point-to-Point protocol and how it is used for Internet ISDN Backup Connections.
http://www.firewall.cx/networking-topics/wan-technologies/237-isdn-introduction.html
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