T3s are used for a variety of purposes. They are widely embedded in the network transport architecture as a convenient means of carrying 672 voice channels in one circuit. Newer T3 applications include the transport of broadcast-quality video, ATM (Asynchronous Transfer Mode) physical layer connections, and supercomputer direct links. This handbook gives you an overview of T3 and T1 technology and equipment. It also shows you the basics of troubleshooting and sectionalizing problems with T3 and T1 circuits. Note that T3 and T1 are general terms that refer to the transmission of 44.736 Mbps and 1.544 Mbps digital circuits over any media. T3 and T1 can be transported over copper, fiber, or radio. DS3 and DS1 are the terms for the electrical signal found at the metallic interfaces for these circuits where most testing is performed.
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