VDSL Performance & Tuning

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393 posts

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#869611 31-Jul-2013 22:17

gabesmith: Still early days but I have noticed a drop in the Remediable Errors (FEC) rates which is a good sign. Unrecoverable errors (CRC) and (ES) are still 0 as with prior to this change.

Is there anyway I can speed up the DLM process to get me off 15ms latency and INP 2.0? Would requesting a port refresh help this?

It might do - most people seem to start on DLM 6 which is 8ms.

Jexlar

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#869680 1-Aug-2013 07:49

After my recent problem and the refreshes that both snap and chorus done I got put back on to DLM 1 with 1ms latency.

Dairusire

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#869717 1-Aug-2013 09:03

Testing a new pilot VDSL2 connection at work atm.

Started up the connection on tuesday, on DLM 6. Had a DLM resync last night now onto what looks like DLM-3, so quite a nice sizable just in DLM with still no CRC errors.

hio77

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#869739 1-Aug-2013 09:39

Dairusire: Testing a new pilot VDSL2 connection at work atm.

Started up the connection on tuesday, on DLM 6. Had a DLM resync last night now onto what looks like DLM-3, so quite a nice sizable just in DLM with still no CRC errors.

that DLM level would be horrible!

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stevehodge

393 posts

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#869768 1-Aug-2013 10:46

hio77:
Dairusire: Testing a new pilot VDSL2 connection at work atm.

Started up the connection on tuesday, on DLM 6. Had a DLM resync last night now onto what looks like DLM-3, so quite a nice sizable just in DLM with still no CRC errors.

that DLM level would be horrible!

Since it's a work connection they probably aren't worried about the latency, and the sync rate is very good for that DLM level and attenuation. If it were me I'd be pretty happy with that connection.

hio77

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#869774 1-Aug-2013 10:51

stevehodge:
hio77:
Dairusire: Testing a new pilot VDSL2 connection at work atm.

Started up the connection on tuesday, on DLM 6. Had a DLM resync last night now onto what looks like DLM-3, so quite a nice sizable just in DLM with still no CRC errors.

that DLM level would be horrible!

Since it's a work connection they probably aren't worried about the latency, and the sync rate is very good for that DLM level and attenuation. If it were me I'd be pretty happy with that connection.

yes, the speed is great, but in terms of tcp latency windows.. your talking close on 34~ms to the first hop, that could be pretty hectic in terms of international connections without window scaling/tuning..

i personally wouldn't want latency that high.. but i can see where it wouldn't matter so much for a business..

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gabesmith

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#869783 1-Aug-2013 11:05

stevehodge:
gabesmith: Still early days but I have noticed a drop in the Remediable Errors (FEC) rates which is a good sign. Unrecoverable errors (CRC) and (ES) are still 0 as with prior to this change.

Is there anyway I can speed up the DLM process to get me off 15ms latency and INP 2.0? Would requesting a port refresh help this?

It might do - most people seem to start on DLM 6 which is 8ms.

Well a call to snap to request a port refresh later, and I am now on DLM-1. Here is hoping the CRCs stay under control and that DLM is kind to me.....

Thanks all for the advice on the home cabling, I guess I have learnt the hard way how important this is with VDSL.

Dairusire

333 posts

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#869787 1-Aug-2013 11:13

hio77:
stevehodge:
hio77:
Dairusire: Testing a new pilot VDSL2 connection at work atm.

Started up the connection on tuesday, on DLM 6. Had a DLM resync last night now onto what looks like DLM-3, so quite a nice sizable just in DLM with still no CRC errors.

that DLM level would be horrible!

Since it's a work connection they probably aren't worried about the latency, and the sync rate is very good for that DLM level and attenuation. If it were me I'd be pretty happy with that connection.

yes, the speed is great, but in terms of tcp latency windows.. your talking close on 34~ms to the first hop, that could be pretty hectic in terms of international connections without window scaling/tuning..

i personally wouldn't want latency that high.. but i can see where it wouldn't matter so much for a business..

haha yeah dont want latency this high as I'm planning on trying to use SIP over that connection. So just going to let this DLM profiling settle in before we do that so I can get DLM-1, with the lowest possible ping.

cruxis

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#870183 1-Aug-2013 18:11

Why does the older firmware produce a better sync. I have gone went from 40/10 to 50/10 downgrading.

hio77

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#870187 1-Aug-2013 18:16

cruxis: Why does the older firmware produce a better sync. I have gone went from 40/10 to 50/10 downgrading.

seems to be something about the tweaks they made to improve lines (going of the changelog here), while helping longer lines a little, it has harmed very short lines..

few people seem to have experienced this unfortunately...

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cruxis

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#870210 1-Aug-2013 18:57

Well I sat out my 10 Days on the latest firmware, have I now lost my chance to get on the 17a profile? With the older firmware I am getting what I expected being next a cabinet. Line is Stable and no errors.

Bme: 1 Port: 1
Downstream line rate: 57504 kbps
Upstream line rate: 11900 kbps
Bearer0 Downstream payload rate: 0 kbps
Bearer1 Downstream payload rate: 50544 kbps
Bearer0 Upstream payload rate: 0 kbps
Bearer1 Upstream payload rate: 10352 kbps
Downstream attainable payload rate: 50544 kbps
Downstream attainable line rate: 61992 kbps
Downstream Training Margin: 12.0 dB
Downstream Line Protection (Bearer1 Path): 0.0 DMT Symbols
Upstream Line Protection (Bearer1 Path): 0.0 DMT Symbols
Near-end ITU Vendor Id: 0x040041564d004413
Far-end ITU Vendor Id: 0xb500494b4e530001
Downstream delay: 7.7 ms
Upstream delay: 7.7 ms
Tx total power -22.2 dbm
FE Tx total power 13.5 dbm
VDSL Estimated Loop Length : 273 ft
G.Hs Estimated Near End Loop Length : 0 ft
G.Hs Estimated Far End Loop Length :0 ft
Current framing mode: 0x10 EFM
Bandplan Type...........: 1
No. of Upstream Bands...: 1
No. of Downstream Bands.: 2
Line Type: 0x00200000 VDSL2 Profile 8B

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Xternal

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#870214 1-Aug-2013 19:02

Get snap to run a port refresh on your line, this will delete all current DLM data and start a new 10 day monitoring period.

hio77

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#870219 1-Aug-2013 19:06

17a is a funny thing, some get it in their training period, others take months to get there..

worth pointing out, your not at DLM-1 yet.

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stevehodge

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#870222 1-Aug-2013 19:10

cruxis: Well I sat out my 10 Days on the latest firmware, have I now lost my chance to get on the 17a profile?

I doubt it. We don't really know what the requirements for 17a are or how the system (which may or may not be DLM) decides when to shift people. So far the only thing I'm sure about is attenuation and yours is obviously good enough for that.

seatil

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#871809 5-Aug-2013 08:22

hio77: nice, a shame that 46 would kill dlm-1 pretty fast.. 52mbit for 10db really isnt too bad.

Anyone know how fast DLM should be killing it? I haven't seen any DLM changes yet - still on DLM-1 - and currently running @9dB with 46 CRCPM.

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