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Seminar - An Overview of Communications Technologies


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Module 5 - SONET, WDM, DWDM and B-ISDN Technologies                                                             Slide 24 of 76 _________________                                                                                  __________

            North American and European Non-Synchronous Hierarchies

  North American Rates       European Rates
Signal Speed Channels Signal Speed Channels
DS-0 64 K bps 1 DS-0 E-0 64 K bps 1 E-0
DS-1 1.544 M bps 24 DS-0s E-1 2.048 M bps 32 E-0s
DS-2 6.3 M bps 96 DS-0s E-2 8.45 M bps 128 E-0s
DS-3 44.8 M bps 28 DS-0s E-3 34 M bps 16 E-1s
        Not Defined E-4 140 M bps 64 E-1s

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North American and European non-synchronous hierarchies are different.