Question Details:
How can i connect another computer in a different room that has a phone line to the internet on the home phone/adsl line,both have the same modem DSL-520T. When one computers online the other connection drops out.
Answer:
You need to install a router. Connect the router to the modem and the two computers to the router.You will find details on the router's manual.
For more details read this article:
How To Set Up a Network Router