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23 December, 14:58

What is a Digital Service (DS) level and framing specification for digital streams over circuits in the North American transmission hierarchy at 1.544 Mbps?

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  1. 23 December, 15:22
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    DS-1

    Explanation:

    DS-1 known also as carrier T1 is part of the T carrier hierarchy and has 24 channels. It was created by AT&T in 1957 and implemented in 1960. DS means digital signal which implies that it was meant for digital signals communication and it was used to transmit voice signals in a long - hual pause code modulation transmission. there are signal levels or carriers in the T carrier hierarchy ranges from 64kbps (DS0) to 274Mbps (DS4).
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