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waiting_for_baudot
Aspiring Contributor
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Message 1 of 20

low line speed with high CRC/HEC and error seconds - faulty line?

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Hi,
       We migrated to BT aprox two weeks ago and I have noticed that the line spped has been absolutly constant through the whole time rather than settling to some value as the line rate adapts.
 
The HH3 stats are a bit odd, the noise margin is high, usualy around 15dB (during the day) and there seems a high rate of CRC/HEC errors and error seconds. 
 
The HH3 is directly connected to the master socket, which is of the modern kind, and there is no extension wiring, I have traced the wire from the master socket directly to the outside of the house.
 
A quiet line test shows some line noise, best described as a slight burbly rustling and 50Hz hum, but no crackling.
 
On tracing the wire from the master socket I noticed something interesting, there are five line drops to the house from the nearest pole, four of them are pristeen with neat wiring and connections shielded from the elements with boxes mounted on the wall but the remaining wire is a complete mess, not fixed to the wall and wavinig in the breeze with a connection that looks from the ground to be unprotected twisted wires covered in insulation tape but may be crimped. Guess which one is the live connection... 
 
Is there enough evedence here to say that I have a faulty line?
 
Thanks in advance for your help
 
 

 

Note that I reset the HH yesterday to try and force a rate change, up to then the connection had been stable for many days.

 

Line state:Connected
Connection time:1 days, 00:47:27
Downstream:2.219 Mbps
Upstream:288 Kbps
 
ADSL Settings
VPI/VCI:0/38
Type:PPPoA
Modulation:G.992.1 Annex A
Latency type:Fast
Noise margin (Down/Up):14.0 dB / 26.0 dB
Line attenuation (Down/Up):50.2 dB / 31.0 dB
Output power (Down/Up):18.5 dBm / 11.9 dBm
FEC Events (Down/Up):0 / 8
CRC Events (Down/Up):5431 / 27
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):8130 / 0
Error Seconds (Local/Remote):3857 / 31

 

The speed test shows a speed corresponding to the connect rate:-

 

Your DSL Connection Rate :2.27 Mbps(DOWN-STREAM), 0.29 Mbps(UP-STREAM)
 IP Profile for your line is - 2 Mbps

 

 

 

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19 REPLIES 19
Distinguished Sage
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Message 2 of 20

Re: low line speed with high CRC/HEC and error seconds - faulty line?

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if you have noise on the quiet line test then that needs reporting as it will affect your broadband performance report it to BT faults on 151 with no mention of broadband in the call
also your noise margin is high as the standard default is 6dB

please avoid restarting the hub as this will only increase your noise margin further and reduce your speed further
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_dreamer_
Aspiring Expert
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Message 3 of 20

Re: low line speed with high CRC/HEC and error seconds - faulty line?

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Are you on a fixed speed package as your upstream limit of 288 is an indication of that? Therefore your speed won't vary much.
waiting_for_baudot
Aspiring Contributor
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Message 4 of 20

Re: low line speed with high CRC/HEC and error seconds - faulty line?

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>Are you on a fixed speed as your upstream limit of 288 is an indication of that?

 

Before the line was migrated to BT we were on a fixed 2Mb line speed but it should now be RADSL. Do you think that hasn't happened? That would certainly explain the lack of movement!

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_dreamer_
Aspiring Expert
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Message 5 of 20

Re: low line speed with high CRC/HEC and error seconds - faulty line?

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Hi,
It's looks to me as if you are still on a fixed speed, try contacting BT either via emailing the mods or phoning them up and explain that you believe you are still on a fixed speed and shouldn't be.
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Distinguished Sage
1,079 Views
Message 6 of 20

Re: low line speed with high CRC/HEC and error seconds - faulty line?

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You may indeed be on a fixed speed I would not suggest phoning BT this problem has happened before and the help line seem to get confused as these products are not sold any more
But I suggest you contact the forum mods they should be able to get this problem sorted for you this is a link to them http://bt.custhelp.com/app/contact_email/c/4951


They normally reply by email or phone directly to you within 3/5 working days they will take personal ownership of your problem until resolved and will keep you informed of progress


They are a UK based BT specialist team who have a good record at getting problems solved


This is a customer to customer self help forum the only BT presence here are the forum moderators
waiting_for_baudot
Aspiring Contributor
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Message 7 of 20

Re: low line speed with high CRC/HEC and error seconds - faulty line?

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>It's looks to me as if you are still on a fixed speed, try contacting BT either via emailing the mods or phoning them up and >explain that you believe you are still on a fixed speed and shouldn't be.

 

 

 

I've tried the online BT support without getting anywhere so will try the mods.

 

Thanks for your help.

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waiting_for_baudot
Aspiring Contributor
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Message 8 of 20

Re: low line speed with high CRC/HEC and error seconds - faulty line?

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It's been a week since contacting the mods by email with no replies, are they busy at the moment?

 

 

In the mean time I've booked an OR engineer visit to fix the intermittent line noise and have been looking at error stats with 'RouterStatsHub', what a great utility!

 

RouterStatsHub  showed a constant low level errors and a massive spike in errors (100 fold) at approx 9pm every evening. The source doesn't seem to be internal as switching everything off except the Hub doesn't change things during the events and we have no timers on any electrical circuits.

 

Walking outside with a radio tuned to 612KHz, I found a neighbours house radiating very strongly which turned out to be a old DVD player. With that removed 612KHz is quiet all around the village.

 

The 9pm spikes don't produce any noticeable noise on the radio so must be leaking into the line at other frequencies. The radio is smoothly tuneable from 145KHz to 10's of MHz, are there other frequencies to listen at?

 

 

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Distinguished Sage
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Message 9 of 20

Re: low line speed with high CRC/HEC and error seconds - faulty line?

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the mods are very busy but they will get back to you there no other frequencies to check
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waiting_for_baudot
Aspiring Contributor
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Message 10 of 20

Re: low line speed with high CRC/HEC and error seconds - faulty line?

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No other ways of tracking down intermittent interference?

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