Today we start a new series, and it will be focused on the T-carrier transmission systems, beginning with the T-1. This series is inspired by some of the questions that arose last week in a class that I taught. Today we'll start with an overview definition of the T-1, and in subsequent days we'll dive into such issues as T-1 signaling and ones density issues, framing options, and signaling. The role of a T-1 has shifted significantly since it was first introduced in 1962 between Chicago and Skokie, Illinois. Today it is more commonly found as an access circuit rather than an interoffice facility between carrier central offices or MSO hubs. Take a listen as I take you through a general definition and describe some of these common uses today.

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