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Seminar - An Overview of Communications Technologies


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Module 2 - Data Communications Basics and Legacy Technologies                                                Slide 32 of 45 _________________                                                                                  __________

                                     North American Digital Hierarchies

 

Digital Services Level No. of Voice Channels Transmission Rate Corresponding Transmission Service
        DS - 0            1         64 K bps Switched 64 K bps
        DS - 1           24       1.544 M bps             T-1
        DS - 1C           48       3.152 M bps             T-1C
        DS - 2           96       6.312 M bps             T-2
        DS - 3          672      44.736 M bps             T-3
        DS - 4         4032     274.176 M bps             T-4

 

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North American Digital Hierarchies - DS-1 and T-1 systems used in North America. These systems are not compatible with the European digital hierarchies and require conversion from one system to the other system.