Abysmal Speed Drops
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Abysmal Speed Drops
28-04-2013 10:33 AM
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I've conducted the required tests and the results are below.
Link Information
Uptime: 1 day, 17:03:59
DSL Type: G.992.5 annex A
Bandwidth (Up/Down) [kbps/kbps]: 719 / 384
Data Transferred (Sent/Received) [kB/kB]: 0.00 / 124.00
Output Power (Up/Down) [dBm]: 12.5 / 0.0
Line Attenuation (Up/Down) [dB]: 43.0 / 68.5
SN Margin (Up/Down) [dB]: 7.0 / 12.5
Vendor ID (Local/Remote): TMMB / IFTN
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 32 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): 0
Error Seconds (Local/Remote): 70 / 0
FEC Errors (Up/Down): 20 / 0
CRC Errors (Up/Down): 20 / 1,973
HEC Errors (Up/Down): 9 / 954
BT Speed Test:
Download Speed: 0.3 Mbps
Upload Speed: 0.57 Mbps (2x faster than my download speed?)
Ping Latency: 40.88
Performance test attached ...
Re: Abysmal Speed Drops
28-04-2013 12:40 PM
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Also, what model of router do you have?
Re: Abysmal Speed Drops
28-04-2013 1:00 PM
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Re: Abysmal Speed Drops
28-04-2013 1:05 PM
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Re: Abysmal Speed Drops
28-04-2013 1:29 PM
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The ADSL stats you posted show the speed is low and the SNR margin is high, but don't really indicate why that's happened. It sounds like the Dynamic Line Management has repeatedly increased the target SNR margin, which would have caused each successive speed drop. The DLM would do this if it thought the line was unstable, but the DLM can't fix a line fault, all it can do is trade speed for stability.
Re: Abysmal Speed Drops
29-04-2013 12:06 PM
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BT's remote tests say there's no fault on the line, but that's what they always say. I was forced to quit BT once before at a previous address because they continually denied a fault, in that particular instance there quite obviously was one.
The speed is still in the same place today. Time to change ISP?
Re: Abysmal Speed Drops
29-04-2013 1:42 PM
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It's definitely dropping connection, not too often but still often enough for me to think it might be the cause of the slowing down:
<img src="http://ccgi.psmith12.plus.com/visradius/generated/image13672391926284.png"/>
Apologies for standard questions you've probably heard before, but is the router in the master socket and do you see the same sync speeds in the test socket behind the master socket front plate?
Re: Abysmal Speed Drops
29-04-2013 1:51 PM
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Re: Abysmal Speed Drops
29-04-2013 2:03 PM
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Re: Abysmal Speed Drops
29-04-2013 2:08 PM
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If you have a fault on your line, changing ISPs won't fix that, you'll just take the problem with you.
If you hear/have heard any crackling or other noises on the line when using the phone or have had any problems with incoming or outgoing calls, then you need to report a phone fault. Who are you paying line rental to at present?
There is definitely something wrong, with the low DS sync speed and the fact that the modem/router is reporting an ADSL2+ connection which I wouldn't expect with that slow a speed. Have you tried another filter?
Re: Abysmal Speed Drops
29-04-2013 2:21 PM
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Link Information
Uptime: 0 days, 0:13:24
DSL Type: G.992.5 annex A
Bandwidth (Up/Down) [kbps/kbps]: 715 / 576
Data Transferred (Sent/Received) [kB/kB]: 0.00 / 0.00
Output Power (Up/Down) [dBm]: 12.5 / 0.0
Line Attenuation (Up/Down) [dB]: 43.0 / 70.0
SN Margin (Up/Down) [dB]: 6.5 / 7.5
Vendor ID (Local/Remote): TMMB / IFTN
Loss of Framing (Local/Remote): 12 / 0
Loss of Signal (Local/Remote): 1 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): 0
Error Seconds (Local/Remote): 1 / 0
FEC Errors (Up/Down): 9 / 0
CRC Errors (Up/Down): 9 / 2
HEC Errors (Up/Down): 29 / 0
BT Speed Test
Download Speed: 0.29 Mbps
Upload Speed: 0.37
Ping Latency: 48.75
Re: Abysmal Speed Drops
29-04-2013 2:34 PM
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Re: Abysmal Speed Drops
29-04-2013 4:58 PM
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Just posting a log of your recent connection....
<img src="http://ccgi.psmith12.plus.com/visradius/generated/image13672510624971.png"/>
I can see after automated testing we established a phone line fault, have you reported this to your phone provider?
Re: Abysmal Speed Drops
29-04-2013 5:04 PM
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Hi again NotSoFast. OK a few notes of explanation for you then.
The sync speed is the speed you connect to the exchange. This determines a BT IP profile for the line and this is reflected in your Current Line speed (Login required) which doesn't always update quickly.
This determines the maximum speed that data can go on your line.
On 21CN connections (which you are on), because the Current Line speed has to update to match an increase, when you make a resync at a higher speed you won't necessarily see an immediate change in results on a speedtester. This is why your need to look at your sync speeds.
On the Thomson Modem/Router this is called the Bandwidth (Up/Down), in your last posted stats this was 576kbps down, 715kbps up. Your current Downstream (DS) speed is a "Banded" speed which the Exchange DLM (Dynamic Line Management) will have imposed because of the noise/disconnection issues. The DS attenuation has also increased since the previous stats which suggest a bad joint somewhere supported by the fact that the SNRM (Noise Margin) is varying wildly.
If the fault Chris has mentioned has been logged, that will help when you can report a phone fault to BT - but when you do, don't mention the broadband or you will get the run around - just harp on about the noisy crackly line which is intermittent, tell them to log that comment and make sure Openreach are advised it's intermittent!
Re: Abysmal Speed Drops
30-04-2013 9:29 AM
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Quote from: Anotherone Do you know what type of fault it was Chris? Vis Radius doesn't look quite so bad, anything you can do about the banded speed?
It doesn't state what type of fault, we could only perform a SNR reset which I'm a little reluctant to do until the fault is fixed.
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