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Author Topic: VDSL2 How many errors is acceptable?  (Read 5245 times)

111888

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VDSL2 How many errors is acceptable?
« on: May 01, 2022, 09:26:42 AM »

Its been 5 days of uptime, I have on the upstream  508 errors. Downstream 0 errors.

Is this in an acceptable range?

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tubaman

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Re: VDSL2 How many errors is acceptable?
« Reply #1 on: May 01, 2022, 09:34:45 AM »

That rather depends what type of errors you are referring to. If it's Errored Seconds (ES) then it sounds just fine.
A screenshot of the page showing the errors would assist.
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roseway

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Re: VDSL2 How many errors is acceptable?
« Reply #2 on: May 01, 2022, 10:32:11 AM »

I've moved this question to the more appropriate forum section, and also deleted the duplicate of the same question.
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  Eric

111888

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Re: VDSL2 How many errors is acceptable?
« Reply #3 on: May 01, 2022, 10:34:43 AM »

here is attachment

I have been having some issues with playing online games, where latency is important. latency in game is showing its fine, but it seems everyone is like 2 secs ahead of me,  could be the servers.
« Last Edit: May 01, 2022, 10:53:45 AM by 111888 »
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cbdeakin

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Re: VDSL2 How many errors is acceptable?
« Reply #4 on: May 01, 2022, 03:46:19 PM »

What are the reported latencies in game?

When you 'ping' websites in Windows, what kind of latencies do you see?

It looks like you are using a TP-Link router, based on your screenshot. It looks like the errors you can see are CRC errors. If this number isn't increasing all the time, it's not worth worrying about.
« Last Edit: May 01, 2022, 03:49:43 PM by cbdeakin »
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111888

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Re: VDSL2 How many errors is acceptable?
« Reply #5 on: May 01, 2022, 04:30:46 PM »

it is increasing all the time. those errors  its now at upstream error: 531

every day upstream error is increasing, even during the day.

In game latency is fine. Below 30% latency. pinging websites shows 8ms ping.




« Last Edit: May 01, 2022, 04:41:45 PM by 111888 »
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Chrysalis

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Re: VDSL2 How many errors is acceptable?
« Reply #6 on: May 01, 2022, 05:21:57 PM »

I would only worry about severely errored seconds.  (SES).

SES occurs when is too many CRC at once.

Errors are normal on a DSL line.
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g3uiss

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Re: VDSL2 How many errors is acceptable?
« Reply #7 on: May 01, 2022, 06:42:48 PM »

Very low error rates really.
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Alex Atkin UK

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Re: VDSL2 How many errors is acceptable?
« Reply #8 on: May 01, 2022, 10:49:00 PM »

Not sure what its reporting seeing as it says Pkts.  I'd assume its ES though, I have 341/day and rock-solid stable.

Code: [Select]
Line Uptime: 134d 17h 21m 13s
Annex: B
Line Mode: G.993.2 (VDSL2)
Profile: 17a
G.INP: D: Not Enabled / U: Not Enabled
Attain Data Rate: 86.765 Mb/s / 24.371 Mb/s
Actual Data Rate: 79.995 Mb/s / 20.000 Mb/s
Impulse Noise Prot: 0.0 sym / 0.0 sym
Interleave Delay: 0.0 ms / 0.0 ms
NFEC: 255 / 255
RFEC: 16 / 16
LSYMB: 21451 / 5410
Interleave Depth: 1 / 1
Interleave Block: 255 / 255
LPATH: 0 / 0
Line Attenuation: 11.8dB / 13.4dB
Signal Attenuation: 11.8dB / 13.2dB
Noise Margin: 4.1dB / 8.0dB
Transmit power: 14.0dBm / 3.3dBm
FECS: 1599837 / 2681385327
ES: 10466 / 45697
SES: 0 / 17
LOSS: 6 / 0
UAS: 145 / 145
HEC: 0 / 0
CRC_P: 0 / 0
CRCP_P: 0 / 0
15m Code Violations: 3 / 4
15m FEC Errors: 26 / 17
1d Code Violations: 115 / 140
1d FEC Errors: 3243 / 2113

Unfortunately a good connection doesn't guarantee good online gaming, as some games penalise people on stable connections to offset those who are not, so you end up with a worse experience.
« Last Edit: May 02, 2022, 01:22:39 AM by Alex Atkin UK »
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kitz

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Re: VDSL2 How many errors is acceptable?
« Reply #9 on: May 02, 2022, 09:27:36 AM »

As mentioned above, TPlink modems record packet errors which are CRCs.  The count will continue increase as long as the modem is up. It is errored seconds that are the important ones as far as DLM is concerned.  508 CRCs in 5 days is negligible.

>> but it seems everyone is like 2 secs ahead of me 

You may be able to get some more stats using StatPOSTer which works on most TPlink modems.

[Moderator edited to fix typo.]
« Last Edit: May 02, 2022, 03:10:21 PM by burakkucat »
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Alex Atkin UK

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Re: VDSL2 How many errors is acceptable?
« Reply #10 on: May 02, 2022, 06:45:47 PM »

Its easy to forget overhead lines will pickup some radio frequencies and underground may pass other cabling.  They've marked outside my DP now and the cable seems to pass direct across the electrical feed to the houses.

Even someone parking their car above the ducting with a bad alternator can cause a sudden burst of errors.

Worth also noting though how much better my line is now since they replaced a damaged drop wire yet from the line stats a problem wasn't entirely obvious until one line failed entirely.
« Last Edit: May 02, 2022, 09:00:41 PM by Alex Atkin UK »
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cbdeakin

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Re: VDSL2 How many errors is acceptable?
« Reply #11 on: May 04, 2022, 03:20:50 PM »

Have you tried using a different router yet?

Regarding the CRC errors, if these aren't increasing every second, I doubt it would make much difference.
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Edinburgh_lad

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Re: VDSL2 How many errors is acceptable?
« Reply #12 on: May 07, 2022, 10:16:25 AM »

I would agree. From my experience of experimenting with Fritzbox and Zyxel, I found no difference. I therefore don't believe that matching the chipset with the Exchange is crucial (or if it is, it has minimal impact on the improvement of the quality of the connection), as modern Lantiq chipsets are as good with Broadcom-based cabinets.
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redanalog

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Re: VDSL2 How many errors is acceptable?
« Reply #13 on: May 12, 2022, 10:20:30 PM »

500 CRCs in 5 days is nothing, realtively speaking

That's 500 errored packets, a packet is between 70 bytes and 1.5Mb.
Anytime these errors are captured, the packet is resent by the source

You'll have no issues in the real world with these kinds of errors
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tubaman

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Re: VDSL2 How many errors is acceptable?
« Reply #14 on: May 13, 2022, 08:18:45 AM »

I would agree. From my experience of experimenting with Fritzbox and Zyxel, I found no difference. I therefore don't believe that matching the chipset with the Exchange is crucial (or if it is, it has minimal impact on the improvement of the quality of the connection), as modern Lantiq chipsets are as good with Broadcom-based cabinets.

On a short line with high sync the chipset probably doesn't make a significant difference. However, on longer lines I can assure you it can very much make the difference between a stable, low errors, connection and an unstable ,high errors, one.
I say this from the experience of trying many different routers and chipsets on my ~800m line. From those I have tried a BCM63168 works best on my line. The common mode filter in my Zyxel VMG8924-B10A also gives an improvement on models without one.
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