standard phone line ( ~150 - ~3500hz). DSL adds a signal at much higher frequencies. (That's why not everyone can get DSL - if your phone line is long and has load coils, they attenuate any higher frequencies; lines served by digital carrier (SLC, DLC, etc.) also cannot carry standard DSL signals. The problem is: 56k modems are pushing the limits of a standard phone line; the out-of-band DSL signal, or dial up services, , NY up services dial up services, dial New York, dial up services
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