The web site everything T1 has a good introduction to T1.
The SONET home page offers a lot of information about SONET.
Here is a good webpage on video compression techniques.
Here is the file Fig 05-15 to be used with Lab #1.
Here is the file Chapter 5_Draft(2) to be used with Lab #1.
Here is the file CPI to be used with Lab #1.
