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Standard User gregcooke
(newbie) Fri 11-Mar-11 07:11:19
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Low sync rate


[link to this post]
 
After an engineer visit where he changed the faceplate & hub for a HH3 the sync was 4.969 after 4 hours it was back to 2.469. I restarted the hub and obtained a sync of 5.0 then within a few hours it was back to 2.531.
Does any know why this should be, I asked for interleaving to be turned off sometime ago but maybe it should be on.

Can any one help?

ADSL Line Status
Connection Information
Line state: Connected
Connection time: 1 days, 15:22:38
Downstream: 2.531 Mbps
Upstream: 448 Kbps

ADSL Settings
VPI/VCI: 0/38
Type: PPPoA
Modulation: G.992.1 Annex A
Latency type: Fast
Noise margin (Down/Up): 13.9 dB / 25.0 dB
Line attenuation (Down/Up): 35.1 dB / 19.0 dB
Output power (Down/Up): 19.0 dBm / 12.3 dBm
FEC Events (Down/Up): 0 / 0
CRC Events (Down/Up): 9000 / 18
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
HEC Events (Down/Up): 2218 / 0
Error Seconds (Local/Remote): 1200 / 19
Standard User shtu
(experienced) Fri 11-Mar-11 11:00:05
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Re: Low sync rate


[re: gregcooke] [link to this post]
 
In reply to a post by gregcooke:
Noise margin (Down/Up): 13.9 dB / 25.0 dB


That is high, suggsts you are on a 12db noise margin, which in turn with the high-then-falls sync speed that you have some noise or line fault that is causing this.

Errored seconds also seems high, 20 minutes worth in a day and a half seems a lot to me.

Any audible line fault? 17070 option 2 and listen carefully.
Standard User RobertoS
(sensei) Sat 12-Mar-11 14:39:11
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Re: Low sync rate


[re: gregcooke] [link to this post]
 
As shtu says, you have a line fault or possibly a wiring problem at home. What the engineer did hasn't solved it.

Inside the master socket when you gently remove the faceplate there is a test socket, on the wall at the back in this pic.

What happens if you plug the filter into that instead of into the front socket?

My broadband basic info/help site - www.robertos.me.uk
My domains,website and mail hosting - Tsohost. Internet connection - IDNet Home Starter Fibre. Live BQM.


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Standard User gregcooke
(newbie) Sun 13-Mar-11 08:40:32
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Re: Low sync rate


[re: shtu] [link to this post]
 
Thanks shtu

Home hub now connected via test socket no other extensions. Sync rate is better, see how long it lasts. Tried the quite line test but the line is silent no crackles etc.

Line state: Connected
Connection time: 0 days, 00:00:25
Downstream: 4.938 Mbps
Upstream: 448 Kbps


ADSL Settings
VPI/VCI: 0/38
Type: PPPoA
Modulation: G.992.1 Annex A
Latency type: Fast
Noise margin (Down/Up): 6.0 dB / 24.0 dB
Line attenuation (Down/Up): 35.1 dB / 19.0 dB
Output power (Down/Up): 19.7 dBm / 12.1 dBm
FEC Events (Down/Up): 0 / 0
CRC Events (Down/Up): 2 / 0
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
HEC Events (Down/Up): 0 / 0
Error Seconds (Local/Remote): 2 / 0
Standard User gregcooke
(newbie) Sun 13-Mar-11 08:45:00
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Re: Low sync rate


[re: gregcooke] [link to this post]
 
Five minutes later the hub re syncs and back to where it was before, any ideas anyone.

Line state: Connected
Connection time: 0 days, 00:01:28
Downstream: 2.531 Mbps
Upstream: 448 Kbps


ADSL Settings
VPI/VCI: 0/38
Type: PPPoA
Modulation: G.992.1 Annex A
Latency type: Fast
Noise margin (Down/Up): 7.3 dB / 24.0 dB
Line attenuation (Down/Up): 35.1 dB / 19.0 dB
Output power (Down/Up): 19.0 dBm / 12.4 dBm
FEC Events (Down/Up): 0 / 0
CRC Events (Down/Up): 618 / 0
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
HEC Events (Down/Up): 109 / 0
Error Seconds (Local/Remote): 120 / 8
Standard User RobertoS
(sensei) Mon 14-Mar-11 22:28:54
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Re: Low sync rate


[re: shtu] [link to this post]
 
In reply to a post by shtu:
Wierd isn't it?

Look at the noise margin on his two new sets of stats, and the error seconds.

A bit baffled here, unless something is wired into the back of the master instead of the faceplate. What do you think?

My broadband basic info/help site - www.robertos.me.uk
My domains,website and mail hosting - Tsohost. Internet connection - IDNet Home Starter Fibre. Live BQM.
Standard User gregcooke
(newbie) Sun 20-Mar-11 09:46:59
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Re: Low sync rate


[re: RobertoS] [link to this post]
 
Nothing attached to master socket no extensions. Engineer changed faceplate as well.
ADSL Line Status
Connection Information
Line state: Connected
Connection time: 5 days, 17:30:33
Downstream: 2.563 Mbps
Upstream: 448 Kbps


ADSL Settings
VPI/VCI: 0/38
Type: PPPoA
Modulation: G.992.1 Annex A
Latency type: Fast
Noise margin (Down/Up): 18.6 dB / 25.0 dB
Line attenuation (Down/Up): 35.1 dB / 19.0 dB
Output power (Down/Up): 18.9 dBm / 12.5 dBm
FEC Events (Down/Up): 0 / 1
CRC Events (Down/Up): 78734 / 32
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
HEC Events (Down/Up): 32143 / 0
Error Seconds (Local/Remote): 6816 / 52
Standard User RobertoS
(sensei) Sun 20-Mar-11 11:23:25
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Re: Low sync rate


[re: gregcooke] [link to this post]
 
The error seconds are definitely pointing at something your end.

When the Home Hub was changed, was the previous power supply used, or was that replaced as well?

Can you try to check the error seconds at intervals perhaps? Maybe ever hour, or two hours, for a bit? See if there is a clue in when they increase?

Edit - I think I might go back to interleaved and see if that helps.

My broadband basic info/help site - www.robertos.me.uk
My domains,website and mail hosting - Tsohost. Internet connection - IDNet Home Starter Fibre. Live BQM.

Edited by RobertoS (Sun 20-Mar-11 11:24:38)

Standard User shtu
(experienced) Wed 23-Mar-11 10:22:33
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Re: Low sync rate


[re: RobertoS] [link to this post]
 
In reply to a post by RobertoS:
In reply to a post by shtu:
Wierd isn't it?

Look at the noise margin on his two new sets of stats, and the error seconds.

A bit baffled here, unless something is wired into the back of the master instead of the faceplate. What do you think?


That would be my next guess. If something's been spliced in further up from the master it's entirely possible it would have been missed when the faceplate was changed.

(My neighbour had Openreach out twice with ADSL problems, and they missed the fact that the old-school wiring left the extensions live with the front part of the master removed - the master was one spur of a star-wired layout - fine for voice, rubbish for ADSL)

Do all the extensions go dead when the test socket is exposed (Test this!)
Alarm system with a dialler?
Oil or Gas tank with a "Watchman"?
Standard User gregcooke
(newbie) Wed 23-Mar-11 23:01:07
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Re: Low sync rate


[re: shtu] [link to this post]
 
No extensions are connected to the face plate just the router & phone via a filter.
The line has been connected nearly 10 days and the noise margin has been between 6.0 & 18.9 during this period.
Line state: Connected
Connection time: 9 days, 06:43:00
Downstream: 2.563 Mbps
Upstream: 448 Kbps

ADSL Settings
VPI/VCI: 0/38
Type: PPPoA
Modulation: G.992.1 Annex A
Latency type: Fast
Noise margin (Down/Up): 12.2 dB / 25.0 dB
Line attenuation (Down/Up): 35.1 dB / 19.0 dB
Output power (Down/Up): 18.9 dBm / 12.5 dBm
FEC Events (Down/Up): 0 / 1
CRC Events (Down/Up): 116468 / 69
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
HEC Events (Down/Up): 47580 / 1
Error Seconds (Local/Remote): 9239 / 81
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