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Dial-Up Connection                          ●
                      Digital Line Subscriber (DSL                                 ●
                                                                                   ●
                                              Leased Lines                         ●
                                           3G/4G                                   ●

                                                        Wi-Fi                      4.2.1

                Dial-up connection

digital signal

                                                                    analog signal
                                                                 56

      DSL (Digital Subscriber Line)                                              4.3

                                            DSLAM                     DSL
                                  DSL

                                                                 100

                                                            DSL                    -1
Asymmetric Digital Subscriber Line (ADSL)

Symmetric Digital Subscriber Line (SDSL)                                           -2
                                                                                   48
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