WiFi to external phone dialup modem

Sep 27, 2018
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Actiontec external dual dial-up phone modem has two cat5 in's for sharing 1 internet connection with 2 CPUs. But there are no line-outs, so I connected a wireless router to the 2nd cat5 in, thinking that would work but nothing. So, what am I missing?
 


 
Yes, modem has been connected for years, just don't know what to change to connect to router for WiFi. CPU goes to what first? To the router then to modem ?