(一) Introduction

linqo

This tutorial will cover the basics of ISDN.
Topics covered will include:

• What is ISDN?
  
• What is ISDN's history?
  
• Why use ISDN?
  
• What are BRI and PRI?  What are Channels?  
  
• What do the layers look like?
  
• What protocols are used?
  
• What happens when a call is set up?
  
• How can I get more information?
  

[color="red"]Note:
This tutorial is designed to be viewed on line.  I have received numerous requests
to have a text-only, .PDF, or single-page printable version of the Tutorial.  
No such document exists.  If you need
a hard copy of this Tutorial, you can print each page in turn with your browser's
print function.  I hope this is sufficient for most people.
               
               
               

本文来自ChinaUnix博客，如果查看原文请点：http://blog.chinaunix.net/u/17855/showart_446882.html