VDSL Performance & Tuning

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#826690 27-May-2013 22:02

hio77:

Signal Attenuation (SATNpb-0): 6.5 dB
Signal Attenuation (SATNpb-1): 27.3 dB

Interesting, that looks like the kinds of stats that JamesL was seeing on his Zytel...

SamF

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#826694 27-May-2013 22:12

hio77: ok, lets see who can break it this time.. since i dont have a Fritz OS 4.0 box to test with, wouldnt be surprised if something broke there now!

http://hio77.com/fritzlog/download/1.1.0.0/fritzboxlog.zip

Works perfectly for me still :) I'm still on the older 99.05.22 firmware.

Man, if we can get those additional figures you're discovering like line length (assuming it's accurate), this little tool is going to be AWESOME for diagnosing lines!!

SamF

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#826697 27-May-2013 22:15

Just correcting my entry.

Attenuation, Distance, Sync, Profile, DLM, CRCPM, SNRM, SNRMT
SamF: 9db, 300m, 49.5mbit, 8b, 1, 0.09, 11, 0
HowickDota: 6db, 150m, 62.8mbit, 17a, 1, 0.3, 12?, 0?
JamesL: 12-13db, 400m, 34.2mbit, 8b, 1, ?, 12?, 0?
SteveH: 4db, 130m, 47968, 8b, 1, 3, 11, 0
SteveH: 5db, 130m, 44720, 8b, 1, 0.87, 11, 0
SteveH: 5db, 130m, 44720, 8b, 1, 0.52, 11, 0
SteveH: 5db, 130m, 43872, 8b, 1, 0.82, 12, +1
SteveH: 5db, 130m, 42296, 8b, 1, 0.14, 13, +2
SteveH: 5db, 130m, 49576, 8b, 1, 6, 5, 0 (weird sync with very low SNRM)
SteveH: 5db, 130m, 50608, 8b, 1, 19, 11, 0 (another weird sync though SNRM is normal)
SteveH: 6db, 130m, 58616, 17a, 1, 0.08, 14, 2
SteveH: 6db, 130m, 69144, 17a, 2, 0.03, 10, -2
HowickDota: 11db, 400m, 38.4mbit, 8b, 6, 0, 12, 0
fellaintga: 8dB, 200m, 55856, 17a, 1?, 0.02, 12, 0

hio77

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#826699 27-May-2013 22:26

SamF:
hio77:
Signal Attenuation (SATNpb-0): 6.5 dB
Signal Attenuation (SATNpb-1): 27.3 dB
Interesting, that looks like the kinds of stats that JamesL was seeing on his Zytel...

that it does..still doesnt really help on reading it though..

SamF:
hio77: ok, lets see who can break it this time.. since i dont have a Fritz OS 4.0 box to test with, wouldnt be surprised if something broke there now!

http://hio77.com/fritzlog/download/1.1.0.0/fritzboxlog.zip

Works perfectly for me still :) I'm still on the older 99.05.22 firmware.

Man, if we can get those additional figures you're discovering like line length (assuming it's accurate), this little tool is going to be AWESOME for diagnosing lines!!

WOO! working on both!

theres 2 elements in the sar interface which seem to refer to lengths, electricalLength and lineLength... im yet to find a single way to access that though, it doesn't seem to be exposed to queries or im picking the wrong checks..

tempted to add a first config element, if telnet is available.. hopefully i dont have to go to that stage though.. its not exactly a reliable service on the firtz(ironic aint it..)

anyone who toys around with telnet, dont touch /bin/supportdata it spits EVERYTHING at you.

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surfisup1000

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#826771 28-May-2013 07:35

I had a faulty vdsl modem for the first 8 days of my Snap new connection. When I eventually received a working vdsl modem I synced on profile "8b" .

After being connected for 5 weeks I was still on profile 8b so I asked Snap for a port reset .

5 days after the port reset I got kicked into profile 17a. So, the port reset did in 5 days what the last 5 weeks of normal dlm did not.

So, my speed is now 66/10, attenuation increased from 2 to 4 for some reason, and CRC errors have been all but eliminated (pre 17a it was around 5-8 errors every 15 minutes, now it is 0 or 1).

I've not done any tweaks on the fritzbox.

So, now I'm just waiting for Snap to offer UFB in Tauranga :) My fibre connection has been ready to go since last September but it appears red tape is more a block (in Tauranga) than the physical connection.

fellaintga

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#826963 28-May-2013 13:00

Ok so mine was actually 5 days after DLM it went to 17a. I think we need another test but it seems like Chorus because of VDSL coming out of trial they have changed so all new connections if possible will go on 17a profile. Does anyone else have a connection less than say 8dB who has been on DLM-1 but not 17a for a few months want to get a port reset to see if 5 days later you will get 17a? Can you post your Spectrum Graph Surf?

hio77

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#826974 28-May-2013 13:06

fellaintga: Ok so mine was actually 5 days after DLM it went to 17a. I think we need another test but it seems like Chorus because of VDSL coming out of trial they have changed so all new connections if possible will go on 17a profile. Does anyone else have a connection less than say 8dB who has been on DLM-1 but not 17a for a few months want to get a port reset to see if 5 days later you will get 17a? Can you post your Spectrum Graph Surf?

im sitting at 9db (be it my line isnt sparkling) but iv considered a getting a port reset on mine, just to see what DLM feels like doing..

how happy are snap to issue resets? (when i was at home, before chorus fixed something along the road, we would need a reset after ever disconnect.. vodafone werent happy to go head and reset ports so not sure if its the same case here..)

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surfisup1000

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#826983 28-May-2013 13:16

fellaintga: Can you post your Spectrum Graph Surf?

Yep, included both. I didn't expect the reduction in errors, would have thought that a higher speed would be more fragile with respect to errors. But, I'm no VDSL expert.

surfisup1000

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#826985 28-May-2013 13:18

hio77:
how happy are snap to issue resets? (when i was at home, before chorus fixed something along the road, we would need a reset after ever disconnect.. vodafone werent happy to go head and reset ports so not sure if its the same case here..)

I just sent an email to snap and they were perfectly agreeable. I'm not sure if my initial dodgy modem made a difference or not.

networkn

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#826986 28-May-2013 13:18

Ok here are my stats, my ISP has managed to convince Chorus to reset the DLM which started 3 days ago. I have had this rate since the DLM restarted:

============================================================================
VDSL Training Status: Showtime
VDSL Profile: Profile 8b
Traffic Type: PTM Mode
Link Uptime: 6 days: 4 hours: 23 minutes
============================================================================
VDSL Port Details Upstream Downstream
Line Rate: 10.366 Mbps 44.020 Mbps
Actual Net Data Rate: 10.330 Mbps 43.951 Mbps
Trellis Coding: ON ON
SNR Margin: 17.0 dB 12.4 dB
Actual Delay: 0 ms 0 ms
Transmit Power: -11.7 dBm 13.5 dBm
Receive Power: 3.0 dBm 16.7 dBm
Actual INP: 0.0 symbols 0.0 symbols
Total Attenuation: 0.1 dB 4294967294.4294967287 dB
Attainable Net Data Rate: 13.392 Mbps 48.080 Mbps
============================================================================
VDSL Band Status U0 U1 U2 U3 D1 D2 D3
Line Attenuation(dB): N/A 14.9 N/A N/A - 3.8 16.7 N/A
Signal Attenuation(dB): N/A 14.4 N/A N/A - 3.8 16.7 N/A
SNR Margin(dB): N/A 17.0 N/A N/A 12.6 12.3 N/A
Transmit Power(dBm): N/A -11.7 N/A N/A 12.8 5.7 N/A
============================================================================

I was on 17a Profile for the 19 months I was with my previous ISP and now I am getting this. Hopefully DLM will make it jump back.

SamF

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#826990 28-May-2013 13:19

fellaintga: Ok so mine was actually 5 days after DLM it went to 17a. I think we need another test but it seems like Chorus because of VDSL coming out of trial they have changed so all new connections if possible will go on 17a profile. Does anyone else have a connection less than say 8dB who has been on DLM-1 but not 17a for a few months want to get a port reset to see if 5 days later you will get 17a? Can you post your Spectrum Graph Surf?

I think your attenuation would need to be under a certain level to get 17a tho.

hio77

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#826991 28-May-2013 13:20

surfisup1000:
fellaintga: Can you post your Spectrum Graph Surf?

Yep, included both. I didn't expect the reduction in errors, would have thought that a higher speed would be more fragile with respect to errors. But, I'm no VDSL expert.

your graph looks rather odd.. the positioning of the upload alone aside from everything else..

shouldnt that end all be part of downstream band 3, how does upload bands end up in there.. would seem something has changed compared to the stats collected for the first post?

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hio77

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#827000 28-May-2013 13:26

networkn: Ok here are my stats, my ISP has managed to convince Chorus to reset the DLM which started 3 days ago. I have had this rate since the DLM restarted:

Total Attenuation: 0.1 dB 4294967294.4294967287 dB

attention looks interesting there..

your line looks pretty good, hows the CRCs going?

looks fine for 17a, seems to be chance still at actually getting on it though..

surfisup1000:
hio77:
how happy are snap to issue resets? (when i was at home, before chorus fixed something along the road, we would need a reset after ever disconnect.. vodafone werent happy to go head and reset ports so not sure if its the same case here..)

I just sent an email to snap and they were perfectly agreeable. I'm not sure if my initial dodgy modem made a difference or not.

hm, that saves the effort of calling too +1 on the motivation level for it then.. kinda want to see how the tool enjoys playing with a connection that DLM is having a go at..

and have a chance to pull more information off telnet too :D

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networkn

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#827009 28-May-2013 13:33

attention looks interesting there..

your line looks pretty good, hows the CRCs going?

looks fine for 17a, seems to be chance still at actually getting on it though..

1197 Down 566 Up.

hio77

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#827014 28-May-2013 13:41

networkn:

attention looks interesting there..

your line looks pretty good, hows the CRCs going?

looks fine for 17a, seems to be chance still at actually getting on it though..

1197 Down 566 Up.

over the 6 days, thats really not bad..

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