most adsl connections are on a contention ration of 50:1 (you share the bandwith with up to 50 other users in your area). some services however are on a 20:1 ratio, and premium business solutions are normally at 5:1. I guess you have to pay for guaranteed bandwith (or live miles from anyone)
if you want to check your system out you could try some of the following:
try just a telephone on the line - is there any background noise? (crackles / humming) this could indicate a fault with somewhere with your line. most telecoms companies have a dial code for testing the line (in the UK this is 17070 and you can then run a quiet line test )
have you tried replacing the microfilters? (each device on the line needs its own microfilter)
sometimes on a noisy line the situation has been helped by daisy chaining multiple filters together.
or try just using the DSL router as the only device on the line with no microfilter, connected directly to the telephone socket.
normally i find that vendor supplied DSL routers are not that great, and I tend to replace them for something better (in the UK companies normally supply some variation of Netgear router, which are not the most stable of devieces, and need rebooting often). At work we look after over 250 DSL connections, so I have had quite a bit of experience in this matter.
if you are looking for a good ADSL router try looking at the offerings from Zyxel (we use the PW-661HW-D range) and we have never had any major problems with the later versions. (the non "D" versions had a tendency to lock up after about a month of use).
any other questions just give me a shout.
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