... services and capabilities increased the demand for T1 circuits such that the waiting time for installation was several months. Advantages of T1 Each T1 is equivalent to 24 separate circuits between two sites, an advantage for T1 because multiple lines and multiple-site networks are expensive and hard to manage. The end-user equipment at each site can be PBXs, videoconferencing systems, imaging systems, or host computers. T1s connecting two PBXs are called tie trunks. For some old PBXs that cannot directly receive a T1 signal, a T1 line must first be terminated at a channel bank. Analog lines are subject to noise and signal deterioration, and equipment that is used for reconstructing the analog signal cannot make them suitable for data transmission, because analog lines amplify both original signal and noise. T1 circuits are more immune to noise and distortion than multiple lines. T1 signals can also be corrupted, but because they ...

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