Integrated T1 (also called channelized T1) is a digital carrier modulation method in which a T1 line is divided into 24 channels, each having a maximum data speed of 64 thousand bits per second (Kbps), and each capable of supporting a unique application that can run concurrently with, but independently of, other applications on different channels.
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T1 is the most commonly used digital carrier method used in the United States, Canada, and Japan, carrying 24 pulse code modulation (PCM) signals with time-division multiplexing (TDM) at an overall rate of 1.544 million bits per second (Mbps).
Integrated T1 has become popular with businesses because of its flexibility. It allows an enterprise to run several services, such as local telephone, long-distance telephone, Internet, and voice over IP (VoIP) over a single circuit at the same time. Integrated T1 should not be confused with fractional T1. A fractional T1 line is leased to a customer at a fraction of the data-carrying capacity of a conventional T1 line and at a correspondingly lower cost.