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I moved my main desktop computer up one floor which unfortunately does not have a WIFI connection and still requires an Ethernet cable. For some reason I am not able to connect my DSL modem to my phone outlets on the upper floor (the modem only works with the one outlet downstairs). I opted to run a longer phone cable up to my router. Now the connection drops more frequently and the speed is horrendous.

I am now wondering if having the cable run up in this manner is causing performance problems.

How can I get the modem to work with the other phone outlets?


UPDATE (answers to Qs below):

  1. All other outlets can function as phone lines and are working.
  2. When I move the operation downstairs again I get full speed.
  3. There is about 20 feet of phone cable running up.
  4. The DSL filter was removed.
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Do your other phone outlets work as phone lines? –  Marcus Chan Jan 28 '13 at 7:13
    
if you move it back downstairs, does it work correctly again? –  Keltari Jan 28 '13 at 7:18
    
About how much extra wire is the signal now running through? Distance does matter and can degrade signal quality thereby decreasing the speed a modem syncs at. You can always call your ISP and ask them to tell you what rate the modem synced at and test the signal to noise ratio on the circuit. They should also be able to run a line test (plugged/unplugged test) to get the distance on the line between the DSLAM and modem and tell you if you passed a boundary by extending the circuit. –  MaQleod Jan 28 '13 at 9:46
    
Did you remove the DSL filter on the jack upstairs before connecting the modem? That will keep it from working. –  CharlieRB Jan 28 '13 at 13:56
    
What kind of "phone cable" are you using to extend the connection upstairs? Ordinary phone extension cables are cheap, not twisted pair cable, and are only good for voice bandwidth (< 4 KHz). You need to use twisted pair cable, aka UTP. The problem is finding UTP with RJ11 instead of RJ45 plugs. –  sawdust Jan 28 '13 at 21:59
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