Should the phone affect my SNR this much?

[#1]

Hi Sam,
If you can try the test socket with a normal filter then I can check out your line for you and see how it's performing.
Jojo

[#2]

Hi Jo,
I've had the phone in the test socket since Friday evening.  I've got a slightly higher synch speed and things were stable (5440 from 5312).  I disconnected this morning though as I read that the synch rate was not adaptive, so need to disconnect to see changes in synch rate if I change the setup (I could of sworn I used to see changes immediately  :-[).  Anyway, if I disconnect the phone completely and restart, the synch improves to 6112 (from 5440), so the phone is obviously causing some not insignificant issues.  I'll buy a different cable for the phone when I can to see if that's the problem. Anyway, I'm pasting my stats from just before I disconnected (phone plugged in) and also my current stats (no phone).  However, I'll have to plug the phone back in as we do use it. 

JUST BEFORE RECONNECT, PHONE PLUGGED IN
Link Information -
Uptime: 2 days, 11:38:31
DSL Type: G.992.1 annex A
Bandwidth (Up/Down) [kbps/kbps]: 448 / 5,440
Data Transferred (Sent/Received) [kB/kB]: 0.00 / 0.00
Output Power (Up/Down) [dBm]: 11.5 / 19.5
Line Attenuation (Up/Down) [dB]: 23.0 / 38.0
SN Margin (Up/Down) [dB]: 23.0 / 6.0
Vendor ID (Local/Remote): TMMB / ALCB
Loss of Framing (Local/Remote): 11 / 0
Loss of Signal (Local/Remote): 25 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): 0
Error Seconds (Local/Remote): 11 / 0
FEC Errors (Up/Down): 0 / 60,108,836
CRC Errors (Up/Down): 0 / 771
HEC Errors (Up/Down): 0 / 448

CURRENT STATS, NO PHONE AFTER RECONNECT
Uptime: 0 days, 0:23:34
DSL Type: G.992.1 annex A
Bandwidth (Up/Down) [kbps/kbps]: 448 / 6,112
Data Transferred (Sent/Received) [kB/kB]: 0.00 / 0.00
Output Power (Up/Down) [dBm]: 11.5 / 19.5
Line Attenuation (Up/Down) [dB]: 23.0 / 38.0
SN Margin (Up/Down) [dB]: 23.0 / 7.0
Vendor ID (Local/Remote): TMMB / ALCB
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): 0
Error Seconds (Local/Remote): 0 / 0
FEC Errors (Up/Down): 0 / 420
CRC Errors (Up/Down): 0 / 3
HEC Errors (Up/Down): 0 / 2

[#3]

If it's a DECT phone I've seen a few people recommend double filtering. Maybe that would help.

[#4]

Why would a DECT phone interfere with a broadband router ?
I can understand the old analogue non-DECT wireless telephones being an issue, for example the old AM sets used 1.7Mhz which might knock out ADSL2.
A DECT phone uses frequencies 1880 to 1930MHz - similar to GSM mobile phones
21CN ADSL2+ uses frequencies 25KHz to 2.2MHz
Therefore they are magnitudes apart and should not be interfering, unless the phone is faulty or has a very noisy power supply adaptor.
Similarly because of the frequencies, DECT should not interfere with the router's WiFi either as that would be either 2.4GHz or 5GHz.

[#5]

Quote from: purleigh

Why would a DECT phone interfere with a broadband router ?

Maybe I'm mistaken, pretty sure I've seen it somewhere on here before though. Can't do any harm to try though
Edit. Found example here and here and more recently I'm sure.