I've been experiencing connectivity issues with my (Eclipse) ADSL service for a while, with the connection seemingly dropping under load (i.e. when trying to download anything substantial).
This being a long weekend and trying to think of the kind of questions an ISP might ask, I bought a new router/modem (ASUS DSL-N66U), replacing a NetGear DGND3300. I setup the new equipment, configured it easily enough, and all was fine. It didn't fix the connectivity issues but I was confident that it wasn't the hardware.
Next, I decided to simply the telephone wiring which leads to my DSL modem, in order to get closer to the master/test socket.
The master socket enters the house on one side of the living room, I have an (plugged, not wired, to the master) extension which takes the socket to the other side of the room. I then had a several metre long telephone cable into a surge suppressor, then a 5m long cable (passing through several floors) to the office which is on the 2nd floor of the house. I also had the base station of a cordless telephone and a Sky HD box plugged into the phone line.
I decided that I could do without the surge suppression but there's not much I can do about the length of the cable. So, to simply, I now have the same 5m cable running into an ADSL splitter/filter on the extension which itself runs about 3m to the master/test socket.
I thought that this would, at least, be an improvement. However, since making this change, all of the line statistics, as read from the modem, have deteriorated and I cannot retain a stable connection (drops every 10-50 minutes).
The SNR down was 14dB and is now 6dB (I thought that higher was better). The line attenuation down was 10dB and is now 21dB (lower is better). Previously the stats read 1 CRC error down and 0 up, now 100s accumulate over about 15 minutes. Finally the data rate has reduced from approximately 8192 kbps to 5024 kbps. Nothing other than the router is plugged into the phone line.
Any thoughts as to what I can do here? I've tried several different filters but can't really replace the phone cable easily (since it runs through 2 floors). Why would this apparent simplification (intended as an improvement) cause such unwanted consequences?