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                     74                                                                      Chapter 3



                  Figure 3-16
                                           1
                  Single-step
                  interleaving into a
                  higher-speed          STS-1s  2
                  multiplexer.
                                           3


                                           4

                                       STS-1s  5


                                           6
                                                                           STS-12
                                           7

                                       STS-1s  8


                                           9


                                          10

                                       STS-1s  11


                                          12












                                     cates that the payload is concatenated, not multiplexed, into three
                                     different payloads. This means that a normal STS-3 carries three
                                     separate STS-1 signals inside, as shown in Figure 3-14. However, in
                                     a concatenated state, the total payload is one super rate multiplexed
                                     signal at 155.52 Mbps instead of three smaller ones at 51.84 Mbps
                                     each. This is shown in Figure 3-17.
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