Question : Does a 2nd Phone line effect DSL Speed

Hello,
We have a client that has slow ADSL speed - esp the upload speed being only 140Kbps. Everything seems ok - he is quite far from exchange but not that far, his filters are ok. The only thing different about this setup is that there is a second phone line installed (it uses the 2nd twisted pair that comes into the house) is this known to slow the connection speed due to a risk of cross talk?
Thanks.

Answer : Does a 2nd Phone line effect DSL Speed

The 2nd (voice) line does not go thru any DSL electronics (aka DSLAM). Therefore. the req'd DSL signal which is "modulated" on to a voice line should NOT present on the 2nd line.  

However, even they take 2 different physical paths to the home, he 2 lines could be inadvertently tied together at the home via a faulty 4-wire phone (or related phone accessories) equipment or outside at the Network Interface Device (aka NID).

Run an intial (pre) speedtest (www.speakeasy.net/speedtest) a/o copy down your DSL modem/router statistics (noise, attenuation, speed, bandwidth, errors,  etc.  Then, if applicable, try removing all Line2 phone devices or (better yet) disconnect the (RJ11) Line2 jack at the NID and re-run your (post) speedtest and refresh/re-record your DSL modem/router "DSL Stats" page.

If you need further assistance, I recommend you post your pre and post test results from above - along with the DSL speeds you are supposed to receive from your ISP.....   P2E