VDSL Performance & Tuning

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'That VDSL Cat'
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#892285 9-Sep-2013 18:03

Vladmax:
hio77: DLM-1 doesnt look impossible for that line, graphs look pretty nice.
your SNR is sitting at 10, rather than 12? and you say you havent tweaked it? that seems a little odd.
the one little spike of RFI doesnt look to have affected your line what was your error rate like on DLM-2? (i assume it made it to that at some point)

No I haven't tweaked anything. It just did it's auto re-sync the other day and went from SNR 12 to 10, sync rate went up from 43 to 47. I had 0 CRC errors and minimum FEC on previous sync which was 43Mbps, 12 SNR, INP 1. now FEC is much higher, CRC is still OK

Latency was 8 before last sync as well

DLM doing odd things once again i suppose then.... give it a bit longer and see what it does.. sounds like DLM is up to something..

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HiTM4N

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#892295 9-Sep-2013 18:32

All I can say is uhh....?

No changes or tweaking on my line...

Also my WAN interface monitor shows this for last night at about 2.30AM

Also log shows this

09.09.13 02:38:16 DSL is available (DSL synchronization exists with 36032/10344 kbit/s).
09.09.13 02:38:00 DSL synchronization starting (training).
09.09.13 02:36:05 Internet connection cleared.
09.09.13 02:36:05 PPPoE error: Internet synchronization lost.
09.09.13 02:36:05 DSL not responding (no DSL synchronization).
09.09.13 02:35:54 PPPoE error: Timeout.
09.09.13 02:35:40 PPPoE error: Timeout.
09.09.13 02:35:27 PPPoE error: Timeout.
09.09.13 02:35:13 PPPoE error: Timeout.
09.09.13 02:34:59 PPPoE error: Timeout.
09.09.13 02:34:45 PPPoE error: Timeout.
09.09.13 02:34:31 PPPoE error: Timeout.
09.09.13 02:34:18 PPPoE error: Timeout.
09.09.13 02:34:04 PPPoE error: Timeout.
09.09.13 02:33:51 PPPoE error: Timeout.
09.09.13 02:33:37 PPPoE error: Timeout.
09.09.13 02:33:24 PPPoE error: Timeout.
09.09.13 02:33:10 PPPoE error: Timeout.
09.09.13 02:32:57 PPPoE error: Timeout.
09.09.13 02:32:43 PPPoE error: Timeout.
09.09.13 02:32:30 PPPoE error: Timeout.
09.09.13 02:32:16 Timeout during PPP negotiation.
09.09.13 02:32:16 Internet connection cleared.
09.09.13 02:32:16 IPv6 Internet connection was cleared; prefix no longer valid.

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hio77

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#892299 9-Sep-2013 18:36

that looks like PRGT (or something like that - i used to use it too.) its graphing can be a fair bit off if your using the free version, just a warning on that.

as for your SNR changes, and error spikes, wut, is indeed the only words for it.. looks like something on your link went iffy..

however! 3 SNR and only 0.04 CRCPM! that could be wonderful! lol..

keep an eye on it, see if its a time of the night sorta thing..

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HiTM4N

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#892302 9-Sep-2013 18:40

hio77: that looks like PRGT (or something like that - i used to use it too.) its graphing can be a fair bit off if your using the free version, just a warning on that.

as for your SNR changes, and error spikes, wut, is indeed the only words for it.. looks like something on your link went iffy..

however! 3 SNR and only 0.04 CRCPM! that could be wonderful! lol..

keep an eye on it, see if its a time of the night sorta thing..

Correct that is PRTG

Im liking the speed, hopefully the link will hold but i dont think thatll be likely with and SNR of 3

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hio77

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#892306 9-Sep-2013 18:44

HiTM4N:
hio77: that looks like PRGT (or something like that - i used to use it too.) its graphing can be a fair bit off if your using the free version, just a warning on that.

as for your SNR changes, and error spikes, wut, is indeed the only words for it.. looks like something on your link went iffy..

however! 3 SNR and only 0.04 CRCPM! that could be wonderful! lol..

keep an eye on it, see if its a time of the night sorta thing..

Correct that is PRTG

Im liking the speed, hopefully the link will hold but i dont think thatll be likely with and SNR of 3

with that error rate, it should be able to hold.. i suspect with the way your lines bouncing around, it wont unfortunately however..

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HiTM4N

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#892317 9-Sep-2013 19:12

hio77:
HiTM4N:
hio77: that looks like PRGT (or something like that - i used to use it too.) its graphing can be a fair bit off if your using the free version, just a warning on that.

as for your SNR changes, and error spikes, wut, is indeed the only words for it.. looks like something on your link went iffy..

however! 3 SNR and only 0.04 CRCPM! that could be wonderful! lol..

keep an eye on it, see if its a time of the night sorta thing..

Correct that is PRTG

Im liking the speed, hopefully the link will hold but i dont think thatll be likely with and SNR of 3

with that error rate, it should be able to hold.. i suspect with the way your lines bouncing around, it wont unfortunately however..

Well after A 15min wait to speak with Snap, I spoke it a rather nice support guy who's going to start an 'extended line test' to watch for drops etc as he could see my line dropping regularly and will call back tomorrow.

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stevehodge

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#892374 9-Sep-2013 21:28

HiTM4N: All I can say is uhh....?

Looks like you're getting bad RF interference from something. And it's causing enough problems that the bit loading is well down on 2 of the frequencies.

stevehodge

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#892377 9-Sep-2013 21:30

hio77: with that error rate, it should be able to hold.. i suspect with the way your lines bouncing around, it wont unfortunately however..

The problem is that the error rate is just an average over the lifetime of the connection. It doesn't give you any indication of what the spikes are like. And 3db is not very much of a buffer.

HiTM4N

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#892456 10-Sep-2013 00:12

I don't have the best line

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Vladmax

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#892937 10-Sep-2013 21:35

hio77:
Vladmax:
hio77: DLM-1 doesnt look impossible for that line, graphs look pretty nice.
your SNR is sitting at 10, rather than 12? and you say you havent tweaked it? that seems a little odd.
the one little spike of RFI doesnt look to have affected your line what was your error rate like on DLM-2? (i assume it made it to that at some point)

No I haven't tweaked anything. It just did it's auto re-sync the other day and went from SNR 12 to 10, sync rate went up from 43 to 47. I had 0 CRC errors and minimum FEC on previous sync which was 43Mbps, 12 SNR, INP 1. now FEC is much higher, CRC is still OK

Latency was 8 before last sync as well

DLM doing odd things once again i suppose then.... give it a bit longer and see what it does.. sounds like DLM is up to something..

Had no re-syncs since my last post 2 days ago, that's what I get

are these dynamically updated without re-syncs?

hio77

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#892946 10-Sep-2013 21:39

stevehodge:
hio77: with that error rate, it should be able to hold.. i suspect with the way your lines bouncing around, it wont unfortunately however..

The problem is that the error rate is just an average over the lifetime of the connection. It doesn't give you any indication of what the spikes are like. And 3db is not very much of a buffer.

yes, his graph was pretty clean however.. so that was about the only point to draw conclusions upon.

@HITMAN what are you using to show thoses graphs?

Vladmax:
hio77:
Vladmax:
hio77: DLM-1 doesnt look impossible for that line, graphs look pretty nice.
your SNR is sitting at 10, rather than 12? and you say you havent tweaked it? that seems a little odd.
the one little spike of RFI doesnt look to have affected your line what was your error rate like on DLM-2? (i assume it made it to that at some point)

No I haven't tweaked anything. It just did it's auto re-sync the other day and went from SNR 12 to 10, sync rate went up from 43 to 47. I had 0 CRC errors and minimum FEC on previous sync which was 43Mbps, 12 SNR, INP 1. now FEC is much higher, CRC is still OK

Latency was 8 before last sync as well

DLM doing odd things once again i suppose then.... give it a bit longer and see what it does.. sounds like DLM is up to something..

Had no re-syncs since my last post 2 days ago, that's what I get

are these dynamically updated without re-syncs?

SNR can change without a resync, AFAIK, bitswap cant however.

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smac

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#892947 10-Sep-2013 21:43

Bitswap upstream changes all the time here, no resync.

stevehodge

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#892953 10-Sep-2013 21:56

hio77:
stevehodge:
hio77: with that error rate, it should be able to hold.. i suspect with the way your lines bouncing around, it wont unfortunately however..

The problem is that the error rate is just an average over the lifetime of the connection. It doesn't give you any indication of what the spikes are like. And 3db is not very much of a buffer.

yes, his graph was pretty clean however.. so that was about the only point to draw conclusions upon.

Yes it looked good, although there was an RFI line. But the spectrum is only a snapshot at a particular moment. It doesn't give you any idea of previous spikes or the potential for more.

Vladmax: Had no re-syncs since my last post 2 days ago, that's what I get

are these dynamically updated without re-syncs?

SNR can change without a resync, AFAIK, bitswap cant however.

Bitswap can also change without a resync - I used to regularly have bitswap off immediately after a sync and later find it on. I wonder if that line actually reports whether bitswap has been used rather than whether it is possible. AFAIK there is no negative impact from having bitswap available (actually I don't think there is a negative to actually using it either) so there is no reason for either the modem or the DSLAM to have the capability off if both support it.

HiTM4N

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#892954 10-Sep-2013 21:57

hio77:
stevehodge:
hio77: with that error rate, it should be able to hold.. i suspect with the way your lines bouncing around, it wont unfortunately however..

The problem is that the error rate is just an average over the lifetime of the connection. It doesn't give you any indication of what the spikes are like. And 3db is not very much of a buffer.

yes, his graph was pretty clean however.. so that was about the only point to draw conclusions upon.

@HITMAN what are you using to show thoses graphs?

Vladmax:
hio77:
Vladmax:
hio77: DLM-1 doesnt look impossible for that line, graphs look pretty nice.
your SNR is sitting at 10, rather than 12? and you say you havent tweaked it? that seems a little odd.
the one little spike of RFI doesnt look to have affected your line what was your error rate like on DLM-2? (i assume it made it to that at some point)

No I haven't tweaked anything. It just did it's auto re-sync the other day and went from SNR 12 to 10, sync rate went up from 43 to 47. I had 0 CRC errors and minimum FEC on previous sync which was 43Mbps, 12 SNR, INP 1. now FEC is much higher, CRC is still OK

Latency was 8 before last sync as well

DLM doing odd things once again i suppose then.... give it a bit longer and see what it does.. sounds like DLM is up to something..

Had no re-syncs since my last post 2 days ago, that's what I get

are these dynamically updated without re-syncs?

SNR can change without a resync, AFAIK, bitswap cant however.

That last graph is from the email that you can send get sent from the Fritz box itself

Love of all phones, computers and gadgets

hio77

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#892968 10-Sep-2013 22:20

HiTM4N:
That last graph is from the email that you can send get sent from the Fritz box itself

never knew the push service gave quite so useful stats..

#include <std_disclaimer>

Any comments made are personal opinion and do not reflect directly on the position my current or past employers may have.

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