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  Reply # 683400 9-Sep-2012 14:07 Send private message quote this post

jeffreyh: So perhaps the constent fiddling doesnt help, just one theory.


I was wondering the same thing.  But even if user resets are counted towards forced resyncs\MTBR one would hope the acceptable thresholds they have set are a bit less than 8 days, which I would say around what my average is!


Reading the patent for DLM (which seems to be the most informative thing I can find on DLM!)    it looks like DLM can be configured\implemented in a few ways for how it decides whether something is a wide are resync, a user initiated or a "forced resync" (caused by line conditions) :

1)   They will collect data across multiple connections to determine when an "area-wide" event causes a resync.

2) They may just set a certain figure as an estimate for how many user initiated resyncs there may be then subtrace the figure for this and area-wide to then determine how many forced resyncs there were
OR
3) They may set a threshold so that a resync where the connection is down for less than a certain time period is considered forced, but if it's down for longer then the user probably turned off the modem and it's considered a user initiated resync.
AND\OR
4) They divide the day into time bins then record bins as either having connection\no connection and somehow count contiguous bins to determine which are user initiated and which are forced.


I guess the main take away is that if you're going to initiate a resync yourself, it's best to leave the modem off or disconnected for an extended period to maximise the chance it's recognised\classified as a user resync not a forced resync.



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  Reply # 683401 9-Sep-2012 14:10 Send private message quote this post

I have read some official Chorus docs which state that user initiated resyncs are not counted as 'unstable' line behavior.

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  Reply # 683428 9-Sep-2012 15:24 Send private message quote this post

SamF: I have read some official Chorus docs which state that user initiated resyncs are not counted as 'unstable' line behavior.

That's good to know.

Has anyone actually had the DLM level change after a user initiated resync?



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  Reply # 683430 9-Sep-2012 15:26 Send private message quote this post

Yeah, I have. Went from DLM-4 to DLM-2 IIRC.



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  Reply # 684099 10-Sep-2012 20:42 Send private message quote this post

Well... hit 8 days today and no resync, so I did a manual resync....

No change, still DLM-2 :(

HOWEVER, now my FECPM errors have gone up from ~30 to over 700!! I even tried taking the SNRM up to 16, but the FECs didn't drop!

The only difference I can see is that bitswap is now off.

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  Reply # 684591 11-Sep-2012 20:40 Send private message quote this post

:-/ Damn, sorry man. Interesting my FEC rate seems to be up too, just a bit, now over 20. I also dropped the RFI setting by 1 to see what that did but FEC didn't change. CRC is down though... now around 0.01 and dropping to 0 on and off. I guess I'll just leave it for a couple weeks and see what happens.



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  Reply # 684592 11-Sep-2012 20:41 Send private message quote this post

Yeah, that's pretty much what I'm going to do now as well. :(

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  Reply # 684719 12-Sep-2012 08:42 Send private message quote this post

SamF: I have read some official Chorus docs which state that user initiated resyncs are not counted as 'unstable' line behavior.


Ah but did they say how they determine whether something is a user initiated resync?  Because the British Telecom DLM patent seems to say that they possibly just: 1)  count the first X per time period as user initiated or 2) Only resyncs where modem is offline for longer than X minutes or 3) couhnting connected time in time bins (not sure how this one works) - But it doesn't look like a "smart" measure; it looks like they just guesstimate.



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  Reply # 685237 12-Sep-2012 22:27 Send private message quote this post

Not sure exactly how that works TBH.

In other news, I decided to do another manual resync tonight to see if bitswap would come on since I've been getting ~600 FECPM for the last couple of days. Bitswap didn't come on, but somehow mysteriously my FECPM is back down to ~30! No other changes in stats / settings etc except I'm syncing 100kbits higher on downstream.

Go figure!?

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  Reply # 687530 18-Sep-2012 08:03 Send private message quote this post

Finally, back on DLM-2 :) Dropped a couple more mbps, but can't say I mind as my latency to local servers is back to 20ms (down from ~36ms)   CRC errors still very low so with any luck it might put me onto DLM-1 if I just leave it.



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  Reply # 687558 18-Sep-2012 08:57 Send private message quote this post

sidefx: Finally, back on DLM-2 :) ...... if I just leave it.



It took 7 days for my unit to go from DLM2 to DLM1





_Allan (my blogmy tweetscompany tweetscompany web site)
           Geekzone Speedtest  -  Download: 16.28 mbps  Upload: 5.86 Mbps



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  Reply # 687668 18-Sep-2012 12:22 Send private message quote this post

That's good to hear sidefx! At least you're moving in the right direction! Was that exactly 7 days since your last 'scheduled' change or not?

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  Reply # 687683 18-Sep-2012 12:46 Send private message quote this post

7 days exactly since my last outage, which was unsecheduled (oven blew a fuse on my fusebox - while trying to figure out which one it was I accidently pulled out the one that powers the socket where Fritzbox is plugged in)


18.09.12 04:11:30 Internet connection established successfully. IP address: [], DNS server: 202.37.101.1 and 202.37.101.2, Gateway: 111.69.17.16, Broadband PoP: SNAPDSL-AKL
18.09.12 04:11:25 DSL is available (DSL synchronization exists with 31232/10344 kbit/s).
18.09.12 04:11:12 DSL synchronization starting (training).
18.09.12 04:10:50 Internet connection cleared.
18.09.12 04:10:50 DSL not responding (no DSL synchronization).
10.09.12 18:05:45 Internet connection established successfully. IP address: [], DNS server: 202.37.101.1 and 202.37.101.2, Gateway: 111.69.17.16, Broadband PoP: SNAPDSL-AKL
10.09.12 18:05:41 DSL is available (DSL synchronization exists with 33712/10352 kbit/s).
10.09.12 18:05:27 DSL synchronization starting (training).

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  Reply # 687797 18-Sep-2012 16:35 Send private message quote this post

sidefx: Finally, back on DLM-2
 

That screenshot shows INP as 2.0. With latency of 8ms, that would mean you're on DLM-6. Is that the right screenshot?

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  Reply # 687813 18-Sep-2012 17:17 Send private message quote this post

stevehodge:
sidefx: Finally, back on DLM-2
 

That screenshot shows INP as 2.0. With latency of 8ms, that would mean you're on DLM-6. Is that the right screenshot?


Oh bollocks yeah I wasn't paying attention... so it's actually downgraded me some more?

EDIT: or hang on, is DLM-6 actually "better" than DLM-3... confusing.  Yeah it looks like I'm on DLM-6 not DLM-2 but it's given me a nice reduction in latency from reduced interleaving.

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