VDSL Performance & Tuning

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#936519 18-Nov-2013 11:28

stevehodge:

How close was that switch to the Fritz? It'd be interesting to know if the interference was due to proximity or due to the cable between them. Also, I imagine they were plugged into the same mains circuit and that's certainly a possible route for interference.

10~15M of cat5E cable, basicly the direct opposite corner of the building.. it is also the same mains fuse, but the switch is currently plugged into the mains still, however i dont think it buzz's without anything plugged in, being a green switch turning itself off.

for a test of that, it is directly into itself, returning the buzz, ill capture some data, see the results.

just clicked to a point on this actually... it was plugged into another point over the weekend, which is on the same fuse circuit. will still run a bit of a test, but ild say it might be void.

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stevehodge

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#936521 18-Nov-2013 11:43

hio77:
stevehodge:

How close was that switch to the Fritz? It'd be interesting to know if the interference was due to proximity or due to the cable between them. Also, I imagine they were plugged into the same mains circuit and that's certainly a possible route for interference.

10~15M of cat5E cable, basicly the direct opposite corner of the building.. it is also the same mains fuse, but the switch is currently plugged into the mains still, however i dont think it buzz's without anything plugged in, being a green switch turning itself off.

for a test of that, it is directly into itself, returning the buzz, ill capture some data, see the results.

just clicked to a point on this actually... it was plugged into another point over the weekend, which is on the same fuse circuit. will still run a bit of a test, but ild say it might be void.

It sounds like it's the ethernet connection then. Is your phone wiring cat5/5e/6 or just the old Telecom flat cable? I wonder if the phone line is picking up something from the ethernet cable. That could explain why the errors didn't return to quite the same level - the cables wouldn't have been in exactly the same position.

hio77

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#936536 18-Nov-2013 11:55

stevehodge:
It sounds like it's the ethernet connection then. Is your phone wiring cat5/5e/6 or just the old Telecom flat cable? I wonder if the phone line is picking up something from the ethernet cable. That could explain why the errors didn't return to quite the same level - the cables wouldn't have been in exactly the same position.

DSL is a straight connection from the ETP to the jackpoint, CAT6 as far as im aware. ran under the house

CAT5E to the switch, runs along the floor, only sharing the same space for a meter or so.

so far, its looking like it was carried over the cable itself. switch just working away...

(1) CRC Downstream:0 Upstream: 0 FEC Downstream: 20 Upstream: 0
(2) CRC Downstream:0 Upstream: 0 FEC Downstream: 35 Upstream: 0
(3) CRC Downstream:0 Upstream: 0 FEC Downstream: 68 Upstream: 0
(4) CRC Downstream:0 Upstream: 0 FEC Downstream: 55 Upstream: 0
(5) CRC Downstream:0 Upstream: 0 FEC Downstream: 14 Upstream: 0
(6) CRC Downstream:0 Upstream: 0 FEC Downstream: 26 Upstream: 0
(7) CRC Downstream:0 Upstream: 0 FEC Downstream: 179 Upstream: 0
(8) CRC Downstream:0 Upstream: 0 FEC Downstream: 125 Upstream: 0
(9) CRC Downstream:0 Upstream: 0 FEC Downstream: 5 Upstream: 0
(10) CRC Downstream:0 Upstream: 0 FEC Downstream: 7 Upstream: 0
(11) CRC Downstream:0 Upstream: 0 FEC Downstream: 5 Upstream: 0
(12) CRC Downstream:0 Upstream: 0 FEC Downstream: 107 Upstream: 0
(13) CRC Downstream:0 Upstream: 0 FEC Downstream: 36 Upstream: 0
(14) CRC Downstream:0 Upstream: 0 FEC Downstream: 49 Upstream: 14
(15) CRC Downstream:0 Upstream: 0 FEC Downstream: 28 Upstream: 0
(16) CRC Downstream:0 Upstream: 0 FEC Downstream: 5 Upstream: 0
(17) CRC Downstream:0 Upstream: 0 FEC Downstream: 24 Upstream: 0
(18) CRC Downstream:0 Upstream: 0 FEC Downstream: 90 Upstream: 0
(19) CRC Downstream:0 Upstream: 0 FEC Downstream: 23 Upstream: 0
(20) CRC Downstream:0 Upstream: 0 FEC Downstream: 49 Upstream: 0

i would have really assumed the dsl interface to not be affected so much by a network interface though.. but seems i have been proven wrong.

thinking now that that is resolved, i should look at getting DLM reset and see what happens..

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#936857 18-Nov-2013 19:12

so, with all these oddities, been tinkering with my tool a fair bit..

think i have the system almost perfected now, specifiable time frame also..

Monitoring Error Rates for 20 Mins
(1) CRC Downstream:0 Upstream: 0 FEC Downstream: 24 Upstream: 0
(2) CRC Downstream:0 Upstream: 0 FEC Downstream: 57 Upstream: 0
(3) CRC Downstream:0 Upstream: 0 FEC Downstream: 347 Upstream: 0
(4) CRC Downstream:0 Upstream: 0 FEC Downstream: 51 Upstream: 0
(5) CRC Downstream:0 Upstream: 0 FEC Downstream: 11 Upstream: 0
(6) CRC Downstream:0 Upstream: 0 FEC Downstream: 31 Upstream: 0
(7) CRC Downstream:0 Upstream: 0 FEC Downstream: 61 Upstream: 0
(8) CRC Downstream:0 Upstream: 0 FEC Downstream: 60 Upstream: 0
(9) CRC Downstream:0 Upstream: 0 FEC Downstream: 285 Upstream: 0
(10) CRC Downstream:0 Upstream: 0 FEC Downstream: 148 Upstream: 36
(11) CRC Downstream:0 Upstream: 0 FEC Downstream: 200 Upstream: 0
(12) CRC Downstream:0 Upstream: 0 FEC Downstream: 79 Upstream: 0
(13) CRC Downstream:0 Upstream: 0 FEC Downstream: 12 Upstream: 0
(14) CRC Downstream:0 Upstream: 0 FEC Downstream: 206 Upstream: 0
(15) CRC Downstream:0 Upstream: 0 FEC Downstream: 290 Upstream: 0
(16) CRC Downstream:0 Upstream: 0 FEC Downstream: 12 Upstream: 0
(17) CRC Downstream:0 Upstream: 0 FEC Downstream: 185 Upstream: 0
(18) CRC Downstream:0 Upstream: 0 FEC Downstream: 461 Upstream: 0
(19) CRC Downstream:0 Upstream: 0 FEC Downstream: 182 Upstream: 0
(20) CRC Downstream:0 Upstream: 0 FEC Downstream: 54 Upstream: 0

Averages - CRC Downstream: 137.8 Upstream: 1.8 FEC Downstream: 0 Upstream: 0
Standard Deviation - CRC Downstream: 125.38 Upstream: 7.78 FEC Downstream: NaN
Upstream: NaN

i will be making the counts into times rather than iteration counts too.

figure a system that can do error rates on the fly persay, could be highly useful in checking things out, without trying to work it out, or doing a clean reboot to reset all the fritz's counters - pretty sure you can reset these via telnet however.

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SamF

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#936879 18-Nov-2013 19:39

Lookin' good man!!

hio77

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#937038 18-Nov-2013 22:40

(1) CRC Downstream:0 Upstream: 0 FEC Downstream: 585 Upstream: 0
(2) CRC Downstream:0 Upstream: 0 FEC Downstream: 234 Upstream: 0
(3) CRC Downstream:0 Upstream: 0 FEC Downstream: 338 Upstream: 0
(4) CRC Downstream:0 Upstream: 0 FEC Downstream: 391 Upstream: 0
(5) CRC Downstream:0 Upstream: 0 FEC Downstream: 235 Upstream: 0
(6) CRC Downstream:1 Upstream: 0 FEC Downstream: 317 Upstream: 0
(7) CRC Downstream:0 Upstream: 0 FEC Downstream: 711 Upstream: 0
(8) CRC Downstream:0 Upstream: 0 FEC Downstream: 208 Upstream: 0
(9) CRC Downstream:0 Upstream: 0 FEC Downstream: 277 Upstream: 0
(10) CRC Downstream:0 Upstream: 0 FEC Downstream: 425 Upstream: 0
(11) CRC Downstream:0 Upstream: 0 FEC Downstream: 585 Upstream: 0
(12) CRC Downstream:0 Upstream: 0 FEC Downstream: 231 Upstream: 0
(13) CRC Downstream:0 Upstream: 0 FEC Downstream: 191 Upstream: 0
(14) CRC Downstream:0 Upstream: 0 FEC Downstream: 334 Upstream: 0
(15) CRC Downstream:0 Upstream: 0 FEC Downstream: 359 Upstream: 0
(16) CRC Downstream:0 Upstream: 0 FEC Downstream: 449 Upstream: 0
(17) CRC Downstream:0 Upstream: 0 FEC Downstream: 224 Upstream: 0
(18) CRC Downstream:0 Upstream: 0 FEC Downstream: 237 Upstream: 0
(19) CRC Downstream:0 Upstream: 0 FEC Downstream: 257 Upstream: 0
(20) CRC Downstream:0 Upstream: 0 FEC Downstream: 231 Upstream: 0

Averages - CRC Downstream: 340.95 Upstream: 0 FEC Downstream: 0.05 Upstream: 0
Standard Deviation - CRC Downstream: 141.57 Upstream: NaN FEC Downstream: NaN Upstream: NaN

looks like rates have increased a little.. might just be peak time spikes though..

still a lot lower than it was however..

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SamF

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#937315 19-Nov-2013 14:15

Had an odd re-sync at midnight last night and a subsequent massive drop in CRCs. However, that seems to have backfired as of this morning!

I've seen this kind of thing before, but I'm unsure exactly what's going on here!

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hio77

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#937317 19-Nov-2013 14:16

howd that resync affect your dsl sync? much changes there at all?

is the time correct on the firtz? thats outside of the usal resync time..

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hio77

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#937383 19-Nov-2013 15:52

well, having DLM reset now..

interesting thing however, they are making changes to snap plus apparently.. pushing an update out onto my fritz..

be interesting to see how the changes play out.. apparently i was due to get a phonecall about them

should have results showing up by tomorrow.. i shall eagerly await seeing that 1ms latency back!

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hio77

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#937914 20-Nov-2013 14:01

so, still waiting for my DLM reset to actually go through - i expect my line should drop when that goes through?...

left my line monitoring for 10 hours, give a good test of both the line and the tool.. turns out i put CRCs and FECs around the wrong way.. not a big problem though.

rounding also got a little overlooked!

Averages - FEC Downstream: 88.84667 Upstream: 1.20667 CRC Downstream: 0.00667 Upstream: 0.006667
Standard Deviation - FEC Downstream: 102.94 Upstream: 9.46 CRC Downstream: NaN Upstream: NaN

looking like pretty happy error stats there compared to what i have been seeing..

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stevehodge

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#937918 20-Nov-2013 14:13

hio77:

Averages - FEC Downstream: 88.84667 Upstream: 1.20667 CRC Downstream: 0.00667 Upstream: 0.006667
Standard Deviation - FEC Downstream: 102.94 Upstream: 9.46 CRC Downstream: NaN Upstream: NaN

looking like pretty happy error stats there compared to what i have been seeing..

Are you getting big FEC spikes? It seems odd that the upstream FEC average is 1.2 but the standard deviation is 9.5.

hio77

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#937921 20-Nov-2013 14:15

stevehodge:
hio77:

Averages - FEC Downstream: 88.84667 Upstream: 1.20667 CRC Downstream: 0.00667 Upstream: 0.006667
Standard Deviation - FEC Downstream: 102.94 Upstream: 9.46 CRC Downstream: NaN Upstream: NaN

looking like pretty happy error stats there compared to what i have been seeing..

Are you getting big FEC spikes? It seems odd that the upstream FEC average is 1.2 but the standard deviation is 9.5.

upstreams are rather uncommon..

heres the last 10 mins.

(00:01:00) CRC Downstream:0 Upstream: 0 FEC Downstream: 0 Upstream: 0
(00:02:00) CRC Downstream:0 Upstream: 0 FEC Downstream: 168 Upstream: 0
(00:03:00) CRC Downstream:0 Upstream: 0 FEC Downstream: 3 Upstream: 0
(00:04:00) CRC Downstream:0 Upstream: 0 FEC Downstream: 110 Upstream: 0
(00:05:00) CRC Downstream:0 Upstream: 0 FEC Downstream: 2 Upstream: 0
(00:06:00) CRC Downstream:0 Upstream: 0 FEC Downstream: 141 Upstream: 0
(00:07:00) CRC Downstream:0 Upstream: 0 FEC Downstream: 19 Upstream: 0
(00:08:00) CRC Downstream:0 Upstream: 0 FEC Downstream: 369 Upstream: 0
(00:09:01) CRC Downstream:0 Upstream: 0 FEC Downstream: 0 Upstream: 0
(00:10:01) CRC Downstream:0 Upstream: 0 FEC Downstream: 486 Upstream: 2

your right though, it does seem a little odd..

seems every second minute on average, is a burst on the downstream, how to correlate that into a plausible issue im struggling to pick out however.

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stevehodge

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#937942 20-Nov-2013 14:46

hio77:
stevehodge:
hio77:

Averages - FEC Downstream: 88.84667 Upstream: 1.20667 CRC Downstream: 0.00667 Upstream: 0.006667
Standard Deviation - FEC Downstream: 102.94 Upstream: 9.46 CRC Downstream: NaN Upstream: NaN

looking like pretty happy error stats there compared to what i have been seeing..

Are you getting big FEC spikes? It seems odd that the upstream FEC average is 1.2 but the standard deviation is 9.5.

upstreams are rather uncommon..

heres the last 10 mins.

(00:01:00) CRC Downstream:0 Upstream: 0 FEC Downstream: 0 Upstream: 0
(00:02:00) CRC Downstream:0 Upstream: 0 FEC Downstream: 168 Upstream: 0
(00:03:00) CRC Downstream:0 Upstream: 0 FEC Downstream: 3 Upstream: 0
(00:04:00) CRC Downstream:0 Upstream: 0 FEC Downstream: 110 Upstream: 0
(00:05:00) CRC Downstream:0 Upstream: 0 FEC Downstream: 2 Upstream: 0
(00:06:00) CRC Downstream:0 Upstream: 0 FEC Downstream: 141 Upstream: 0
(00:07:00) CRC Downstream:0 Upstream: 0 FEC Downstream: 19 Upstream: 0
(00:08:00) CRC Downstream:0 Upstream: 0 FEC Downstream: 369 Upstream: 0
(00:09:01) CRC Downstream:0 Upstream: 0 FEC Downstream: 0 Upstream: 0
(00:10:01) CRC Downstream:0 Upstream: 0 FEC Downstream: 486 Upstream: 2

your right though, it does seem a little odd..

seems every second minute on average, is a burst on the downstream, how to correlate that into a plausible issue im struggling to pick out however.

I think it would be more likely to be an artefact of the measurement in the Fritz - perhaps the process that gathers these statistics is running erratically for some reason. Maybe try a slightly longer interval, say 2 mins or 5 mins?

hio77

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#937943 20-Nov-2013 14:51

stevehodge:

I think it would be more likely to be an artefact of the measurement in the Fritz - perhaps the process that gathers these statistics is running erratically for some reason. Maybe try a slightly longer interval, say 2 mins or 5 mins?

possibly.. im plucking it out of the direct total counter however.. which seems very second aware. also lines up almost the same as the firtz ui (in which is rounded.)

the variance seems to vary alot.

(00:28:03) CRC Downstream:0 Upstream: 0 FEC Downstream: 91 Upstream: 0
(00:29:03) CRC Downstream:0 Upstream: 0 FEC Downstream: 72 Upstream: 0
(00:30:03) CRC Downstream:0 Upstream: 0 FEC Downstream: 97 Upstream: 0
(00:31:03) CRC Downstream:0 Upstream: 0 FEC Downstream: 44 Upstream: 0
(00:32:03) CRC Downstream:0 Upstream: 0 FEC Downstream: 73 Upstream: 0
(00:33:03) CRC Downstream:0 Upstream: 0 FEC Downstream: 61 Upstream: 0
(00:34:03) CRC Downstream:0 Upstream: 0 FEC Downstream: 155 Upstream: 0
(00:35:03) CRC Downstream:0 Upstream: 0 FEC Downstream: 38 Upstream: 0
(00:36:03) CRC Downstream:0 Upstream: 0 FEC Downstream: 260 Upstream: 0
(00:37:04) CRC Downstream:0 Upstream: 0 FEC Downstream: 0 Upstream: 0
(00:38:04) CRC Downstream:0 Upstream: 0 FEC Downstream: 85 Upstream: 0
(00:39:04) CRC Downstream:0 Upstream: 0 FEC Downstream: 55 Upstream: 0
(00:40:04) CRC Downstream:0 Upstream: 0 FEC Downstream: 27 Upstream: 0
(00:41:04) CRC Downstream:0 Upstream: 0 FEC Downstream: 12 Upstream: 0
(00:42:04) CRC Downstream:0 Upstream: 0 FEC Downstream: 42 Upstream: 0

take that block for example, its pretty well inline with what i would expect.

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hio77

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#937953 20-Nov-2013 15:27

(00:49:05) CRC Downstream:0 Upstream: 0 FEC Downstream: 60 Upstream: 0
(00:50:05) CRC Downstream:0 Upstream: 0 FEC Downstream: 68 Upstream: 0
(00:51:05) CRC Downstream:0 Upstream: 0 FEC Downstream: 17 Upstream: 0
(00:52:05) CRC Downstream:0 Upstream: 0 FEC Downstream: 511 Upstream: 0
(00:53:05) CRC Downstream:0 Upstream: 0 FEC Downstream: 177 Upstream: 0
(00:54:05) CRC Downstream:0 Upstream: 0 FEC Downstream: 242 Upstream: 0
(00:55:06) CRC Downstream:0 Upstream: 0 FEC Downstream: 7 Upstream: 2
(00:56:06) CRC Downstream:0 Upstream: 2 FEC Downstream: 437 Upstream: 121
(00:57:06) CRC Downstream:0 Upstream: 0 FEC Downstream: 161 Upstream: 0
(00:58:06) CRC Downstream:0 Upstream: 0 FEC Downstream: 300 Upstream: 0
(00:59:06) CRC Downstream:0 Upstream: 0 FEC Downstream: 48 Upstream: 0
(01:00:06) CRC Downstream:0 Upstream: 0 FEC Downstream: 84 Upstream: 0
(01:01:06) CRC Downstream:0 Upstream: 0 FEC Downstream: 63 Upstream: 0
(01:02:06) CRC Downstream:0 Upstream: 0 FEC Downstream: 346 Upstream: 0
(01:03:06) CRC Downstream:0 Upstream: 0 FEC Downstream: 30 Upstream: 0

yep, 121, theres the upstream spike. they are very rare.. but do come every so often..

fair fit of jitter in my FECs right now too, school kids coming home and all i suspect..

double checked with snap, apparently my DLM has been reset, i always understood the port needs to reboot to do so, and so the connection would drop, but seems i was mistaken there.

so far, DLM doesnt seem to be playing its roll however.. guess im just too impatient!

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