Noisy ADSL line, now quiet but line stablised at very slow speed

[#1]

Typically get 15-18 Mbps download, 1.2 Mbps upload but storms a couple of weeks ago caused a nosiy phone line for a couple of days.  Noise has now gone away but connection speed has been 3 Mbps down for a week now with SNR margin of 37 (usually 11 when connected at normal speeds).    Very few errors at this connection speed but could the line please be "reset" to see if it will sync at better speed?    This has happened before and a reset done a couple of weeks later worked previously to restore lost connection speed.

[#2]

@jdsmith Done a reset for you now! Let me know how it goes.

[#3]

@willcutforth   Thank you.  That doesn't seem to have done anything at all - i.e. the connection didn't even drop!  I rebooted the router to force a reconnection and it has immediately adopted the same rate (see below).  It appears to be being forced to reconnect at a slow download speed as the attainable rate has returned to its normal value now that the line noise has disappeared.

	Downstream		Upstream
Actual Rate	3071	Kbps	1023	Kbps
Attainable Rate	21684	Kbps	1024	Kbps
Path Mode	Fast		Fast
Interleave Depth	1		1
Actual PSD	18. 0	dB	10. 5	dB
	Near End		Far End
Trellis	ON		ON
Bitswap	OFF		OFF
ReTx	0		0
SNR Margin	37	dB	9	dB
Attenuation	24	dB	9	dB

[#4]

@jdsmith Which router are you using? Your D/S SNR margin is unbelievably high, indicating a major fault. Is your phone-line silent when doing the Quie Line Test (17070 option 2)?

[#5 · Accepted solution]

@jdsmith Hiya. I've checked and your connection is banded no doubt due to the phone fault, not to say there are no underlying issues still but you won't sync above 3Mbps if you are banded at 3Mbps so I've placed a request to reset the connection, this can take 4 hours. Hope that helps you.

[#6]

Lets just hope that reset reduces the D/S SNR.

[#7]

Thanks everyone, that reset has done the trick.   (Line is silent on the quiet line test)

Router stats now:

Downstream             Upstream                 Actual Rate 20833 Kbps 1163 Kbps Attainable Rate 20820 Kbps 1164 Kbps Path Mode Fast Fast Interleave Depth 1 1 Actual PSD 19. 9 dB 12. 5 dB Trellis ON ON Bitswap OFF ON ReTx 0   0   SNR Margin 6 dB 6 dB Attenuation 23 dB 9 dB

[#8]

Glad it has worked - sorry for my pessimism.

[#9]

I totally understand your pessimism.   If I hadn't had this identical problem several times before in the last 5 years, I would have shared it.  It happens reliably after several days of very heavy rain:  noise appears on phone line,  multiple ADSL disconnects and speed drops until finally established a few days later with a stable slow connection and sky high SNR margin.   Water clearly gets into the system somewhere - I would get it investigated but I'm moving to FTTP imminently so it isn't worth it now.

Thanks for your interest/contribution.