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Your DSL is multiplexed over your phone line. It goes from the wall to your DSL modem to your computer through the Ethernet adapter. You can connect a dialup modem for backup connectivity (if the DSL goes out and you have an available dialup account) and faxing as long as you put a filter on the line to the dialup modem, like you did for your voice telephones. Some DSL modems have a "passthrough" jack for connecting a telephone - you can use this for the line to the dialup modem, it will require a filter. Otherwise, you can put a splitter at the wall jack, or at the output of the surge protector. Filter on the dialup modem side required in both cases.
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