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Administrator MrSaffron
(staff) Sun 22-Jan-12 17:48:29
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Re: FTTC: should I report a fault?


[re: smurf46] [link to this post]
 
It may be the Fritzl modem is not coping well with 17a, depends on what profiles they've tested the firmware. The PSD masks used in the UK can also mean modems do odd things, that have not been fully tested.

You need to verify with the Openreach modem really

Andrew Ferguson, andrew@thinkbroadband.com
www.thinkbroadband.com - formerly known as ADSLguide.org.uk
The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
Standard User smurf46
(member) Sun 22-Jan-12 18:24:16
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Re: FTTC: should I report a fault?


[re: MrSaffron] [link to this post]
 
In reply to a post by MrSaffron:
It may be the Fritzl modem is not coping well with 17a, depends on what profiles they've tested the firmware. The PSD masks used in the UK can also mean modems do odd things, that have not been fully tested.

You need to verify with the Openreach modem really


Thanks Andrew, I think you might be on to it. Although the Fritz! is designed for 17a, and is UK customised, it's not very configurable. I'm wondering therefore as it doesn't have a setting to accept external pings, whether its (inaccessible) firewall might interpret constant pinging as an attack and doesn't always respond which would upset TBBQM. And something similar might happen with speedtests, as I don't appear to have a problem on the BT tester. Will test with a re-install of the OR modem when I get the chance, though I'd like to get a replacement so I can also unlock it and compare data.

We see things not as they are, but as we are .
- Anais Nin
Standard User Bald_Eagle1
(member) Sun 22-Jan-12 18:29:29
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Re: FTTC: should I report a fault?


[re: smurf46] [link to this post]
 
In reply to a post by smurf46:
In reply to a post by MrSaffron:
You need to verify with the Openreach modem really

Will test with a re-install of the OR modem when I get the chance, though I'd like to get a replacement so I can also unlock it and compare data.


HG612 v 2B - Ebay


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Standard User smurf46
(member) Sun 22-Jan-12 18:50:28
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Re: FTTC: should I report a fault?


[re: Bald_Eagle1] [link to this post]
 
Gosh Paul, you are enthusiastic for some comparison stats aren't you! So thanks.

We see things not as they are, but as we are .
- Anais Nin
Standard User Bald_Eagle1
(member) Sun 22-Jan-12 19:01:09
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Re: FTTC: should I report a fault?


[re: smurf46] [link to this post]
 
smile smile smile I'm not sure that "enthusiastic" is a strong enough word smile smile smile
Standard User WWWombat
(committed) Tue 24-Jan-12 13:31:06
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Re: FTTC: should I report a fault?


[re: smurf46] [link to this post]
 
In reply to a post by smurf46:
Thanks Roberto, I know my BQM is horrible!

But why? I've heard of one other person, who had a similar (undiagnosed) issue on the 8c profile, which was cured on the move to 17a. Mine is the other way round, packet loss was clear before the 17a change, then appeared immediately after the resync. But as I achieved no overall speed increase, I can't figure out why? And why do testers show zero packet loss?

Wow - that's bad. I had the same kind of picture on the first 2 days on 8c, though the peaks were nearer 10% and the average under 5%.

DLM obviously intervened after 2 days, added interleaving (which fixed the packet loss entirely) and then (a few more hours later) dropped the speed from 40 to 36Mbps.

Without the hacked modem at the time, I can only guess that I was getting a high number of CRC errors in the first 2 days, which DLM could see and act upon, but that 4% of the pings (carried in ICMP) were dropped. I guess further that the switch to interleaving also turned on FEC, which lost the CRC errors and fixed the packet loss. I don't think I needed the drop in speed (the line worked perfectly with profile 38717 alongside interleaving for perhaps 10 hours), but I guess that went alongside DLM's choice of profile for the line.

I therefore wonder why DLM isn't doing the same to your line, and obviously wonder whether the Fritz is managing to do some to subvert DLM - perhaps by not reporting the CRC statistics back to the cabinet DSLAM.

I think you posted some error stats, so I'll go check those & respond...
Standard User smurf46
(member) Tue 24-Jan-12 14:07:48
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Re: FTTC: should I report a fault?


[re: WWWombat] [link to this post]
 
Thanks, here's current stats after 5 days up (download figs followed by upload):
Max. DSLAM throughput kbit/s 40000 7200
Min. DSLAM throughput kbit/s 20000 3600
Attainable throughput kbit/s 41672 6602
Current throughput kbit/s 39992 6600

Latency 8 ms 0 ms
Bitswap on on
Impulse Noise Protection 3.0 0.0

Signal-to-noise ratio dB 7 6
Line attenuation dB 20 -
Carrier record A43 A43
Profile 17a

FRITZ!Box Errors (ES) 712 Many Errors (SES) 5
Seconds With Remediable Errors (FEC) per Minute 3122 Last 15 minutes 8720382
Not Remediable Errors (CRC) per Minute 0.23 Last 15 minutes 0

DSL central exchange Errors (ES) 584 Many Errors (SES) 0
Seconds With Remediable Errors (FEC) per Minute 0.37 Last 15 minutes 0
Not Remediable Errors (CRC) per Minute 0.07 Last 15 minutes 0

We see things not as they are, but as we are .
- Anais Nin
Standard User smurf46
(member) Tue 24-Jan-12 14:33:47
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Re: FTTC: should I report a fault?


[re: smurf46] [link to this post]
 
Oops, sorry for causing problems to everybody: My Broadband Ping but something happened yesterday (not sure what as I was ill in bed at the time); and just managed to complete my first IPv4 test (which have refused to complete before) on TBB at 29.5 down, 5.6 up (a stalled test just beforehand was showing 33Mbps down according to TBBmeter though!). IPv6 test still shows 6Mpbs down though, with a better upload figure.

We see things not as they are, but as we are .
- Anais Nin

Edited by smurf46 (Tue 24-Jan-12 14:35:27)

Standard User burakkucat
(committed) Tue 24-Jan-12 16:42:36
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Re: FTTC: should I report a fault?


[re: Bald_Eagle1] [link to this post]
 
In reply to a post by Bald_Eagle1:
smile smile smile I'm not sure that "enthusiastic" is a strong enough word smile smile smile
Utterly manic and demented? wink

-----------------------------------------------------

100% Linux and, previously, Unix.
Standard User Bald_Eagle1
(member) Tue 24-Jan-12 17:01:57
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Re: FTTC: should I report a fault?


[re: burakkucat] [link to this post]
 
In reply to a post by burakkucat:
Utterly manic and demented? wink

That's moving in the right direction, but still a long way off smile

I couldn't possibly publicly repeat the terms that Mrs. Eagle has used recently because

a) She would be embarrassed, they are not very lady-like terms

b) They would be immediately censored

Edited by Bald_Eagle1 (Tue 24-Jan-12 17:02:52)

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