Kitz Forum
Broadband Related => FTTC and FTTP Issues => Topic started by: themanstan on May 19, 2012, 06:47:56 PM
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Just sharing some experience.
I appear to have a rather noisy line, there is an electrical substation right next to the ducts leading to my street. Most probable that there is noise coming off a variety of appliances/gadgets in the house too.
Using the google maps measuring tool i get 350 m between me and the cab.
Using the ECI modem i get a 47-51 IP profile and with the Huawei i get 52-54 IP profile.
Huawei gives me a ~62-64 Mbps max.
So it appears the Huawei deals with noise a bit better than the ECI modem.
cheers,
Stan
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Hello Stan,
Welcome to the Kitz forum. Thank you for posting details of your experience, which adds to the reports by others who have also noticed that effect. Just to clarify, you have not made any other changes to the HG612's configuration? In other words, it is just using the Standard rather than the BT firewall setting?
Looking again at your graphs, I wonder if you run a variety of Linux and if you have quite recently downloaded the graphing script from Asbokid's Google Docs directory?
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Hi Burakkucat,
Your latest graphing script (v2.2) for Linux is now in situ :-)
cheers, a
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Hi Burakkucat,
Thanks for the welcome.
Unlocked the HG612 with the SP10 firmware and left it as is. Merely taking advantage of being able to access stats which currently can't be done via a soft method (Kudos to those who've developed a hard method for access).
I'm using the latest graphing scripts, but i'm using Win7 32 bit off a Dell D820 laptop.
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I'm using the latest graphing scripts, but i'm using Win7 32 bit off a Dell D820 laptop.
Hi Stan,
It might be interesting to see your bit-loading & Hlog graphs too, especially as the ECI DSLAM provides upstream values whereas the Huawei DSLAMS don't.
@b*cat,
At least some of us can recognise our own handiwork :P :P
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Hi Bald_Eagle1
As requested!
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Unlocked the HG612 with the SP10 firmware and left it as is. Merely taking advantage of being able to access stats which currently can't be done via a soft method
It is good to know that the result obtained was with both modems in their default configurations.
Kudos to those who've developed a hard method for access
Agreed. :clap2: I've come to the conclusion that Asbokid likes to do a spot of reverse-engineering! :)
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Hi Bald_Eagle1
As requested!
Cheers Stan,
I really must upload my updated scripts one of these days.
In the meantime, you may wish to give the attached GRAPH6.BAT a go (keep your old version just in case though).
It a) produces smaller sized montages for posting in forums & b) it should include some of the data that is "missing" from your current ECI DSLAM graphs.
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At least some of us can recognise our own handiwork :P :P
So that is the latest description ("handiwork") for eagle droppings! :D :crazy:
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A HG612 modem is currently monitoring a connection to an ECI DSLAM.
We are noticing massive DS RSCorr errors following a few hours of connection time.
A modem reboot/resync appears to clear these errors for another few hours.
If left to run, the DS RSCorr error counts gets too high for the 2^31 (i.e. 2147483648) integer maths limit of the batch file scripts.
At that stage, cumulative DS RSCorr errors are still being reported in modem_stats.log, but as the 1 minute differences are no longer calculated, the graphs make it appear that the errors have suddenly ceased.
Can anyone using a HG612 on an ECI DSLAM confirm whether or not this also appears to be the case with your connections.
It may be an incompatibilty matter between the HG612 & the ECI DSLAM, a "fault" requiring an engineer repair or simply that ECI DSLAMS are far more rigorous in "correcting" errors rather than leaving them uncorrected & needing to be resent.
I have attached 8 days of stats from this particular connection.
The effect of Interleaving etc. being applied can be clearly seen, especially a massive reduction in errored seconds.
The far R/H side of the DS RSCorr errors graph shows where the batch file integer limit was reached & the every minute calculation ceased.
At the time of obtaining the stats, DS RSCorr errors were still mounting at the rate of around 600,000 per minute which does seem rather excessive (if it is actually being correctly reported by the HG612).
FWIW, this does NOT appear to be an issue when a HG612 is connected to a Huawei DSLAM.
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this can't be the case on a certain forum they say there is just not enough ECI modems to go about so both ECI dslam and Huawei will work on either dslam. I won't know until someone gives me a ECI modem, but they say Draytechs 2750 works fine on both.
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this can't be the case on a certain forum they say there is just not enough ECI modems to go about so both ECI dslam and Huawei will work on either dslam. I won't know until someone gives me a ECI modem, but they say Draytechs 2750 works fine on both.
Here is an ECI B-FOCuS modem (http://www.ebay.co.uk/itm/120946211332), available on eBay as a "Buy It Now" item.
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The only problem with an ECI modem I will not be able to see my stats I think it's a Hardware Hack for her.
Just going through some HG612 settings I like the LED function it turns off LED's on the modem great if during the wee small hours as they light up the room and keep me awake :D
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We are hoping that The Maestro, now that he has physical access to a couple of the devices, will be able to magic-up a software route to flash the firmware. ;)
Just going through some HG612 settings I like the LED function it turns off LED's on the modem great if during the wee small hours as they light up the room and keep me awake :D
I quite like having the LEDs on, as they illuminate the way out of the room, when I am making my way to my bedroom. I know that some people take a teddy-bear or even their cat to bed with them but a powered up VDSL2 modem . . . Isn't that just a little bit obsessive? :P ::)
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Take the Cats to bed me I don't have to they just take over my bed at night, at 6am I get a big Paw in my face who needs an Alarm clock. >:(
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at 6am I get a big Paw in my face who needs an Alarm clock. >:(
Ah but that shows that you are still loved! (And recognised as a member of staff who provides food. ;D )
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After quite a few months DLM appears to have done its very slow job of bringing my speed back up, IP Profile is now 57.
However, the missus has strung up quite a few Christmas lights... I'm hoping that this doesn't ruin DLMs recovery work...
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After quite a few months DLM appears to have done its very slow job of bringing my speed back up, IP Profile is now 57.
Just to confirm, are you still using an unlocked HG612, or have you reverted to the ECI modem?
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I popped the ECI back in and left it alone.
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I popped the ECI back in and left it alone.
This is from your original post:-
"Using the ECI modem i get a 47-51 IP profile and with the Huawei i get 52-54 IP profile."
That suggested the Huawei modem gave slightly improved performance over the ECI modem.
Your result now suggests that the ECI gives improved performance.
Having monitored a few connections to ECI DSLAMS using the Huawei HG612, I have a theory that ECI modems are actually more compatible than HG612 modems when connected to ECI DSLAMS, other limited reports being the same as your latest feedback.
i.e. given sufficient time, the ECI modem does slightly out-perform the HG612.
As the ECI modem is harder to unlock & we haven't yet fully understood the stats it can provide, we can't easily prove/disprove my theory.
In principle, it would be interesting to see the longer term effect of using an ECI modem connected to a Huawei DSLAM, if only we could work out how to reliably obtain like-for-like statistics.
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Well, I could always pop the Huawei in and leave it for 2-3 months as an experiment to see if we can improve the profile further.
Quite happy to have a punt and see if there are long term differences using either Modem on an ECI cab.
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Well, I could always pop the Huawei in and leave it for 2-3 months as an experiment to see if we can improve the profile further.
Quite happy to have a punt and see if there are long term differences using either Modem on an ECI cab.
That could indeed be a very revealing experiment, but only if you are genuinely up for it.
The attached graphs show a typical day for one of the connections.
Error seconds are low, CRC Errors are low, HEC Errors are quite low, SNRM is very stable, the connection doesn't resync frequently, but look at the quite high Interleaving depth, lowish sync speed & really high RSCorr/FEC Error counts.
This connection is around 450m or less from the ECI DSLAM.
For all we know, the connection may just be poor quality & Interleaving is just doing its job.
On the other hand, it MIGHT be a result of a slight incompatibility between the Huawei HG612 modem & the ECI DSLAM.
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Switched back to Huawei last night and tested it this morning... dropped down to an IP profile of 51.02 Mbps...lets see how long it stays like that...
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Oops. That's not good, sorry :(
That's maybe because SNRM & thus achievable sync speed were lower at the time (noisier at night time).
If you do fancy rebooting the modem when SNRM is likely to be at its highest, that's usually between noon & 2pm.
I wouldn't advise any more rebooting than that though as I wouldn't want DLM to think your connection has suddenly become unstable.
If this ends up being a negative move, please accept my apologies for encouraging you to experiment & by all means reinstate the ECI modem.
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Not a problem.
It will be good for people to know if matching modem/cabs results in DLM being able to bring their speeds back more efficiently than mismatched hardware.
We do know that for my connection that matching results in a recovery. People may be missing out, simply because they want to see their stats at will.
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Not a problem.
It will be good for people to know if matching modem/cabs results in DLM being able to bring their speeds back more efficiently than mismatched hardware.
Apparently that is the case for ADSL connections, Broadcom chipped modem/routers generally performing better than non-Broadcom routers when connected to Broadcom chipped DSLAMS/MSANs or whatever is used for ADSL.
I say apparently as I haven't tested that out as I had no interest in my previous ADSL connection as I knew I could only achieve 1Mb or so (on a good day) due to distance from the exchange.
We do know that for my connection that matching results in a recovery. People may be missing out, simply because they want to see their stats at will.
They may indeed be missing out.
Perhaps for most users though, at VDSL2 speeds on capped speed profiles, it isn't really an issue as 5Mb here & there isn't quite as critical as say 1 or 2Mb on a much lower speed ADSL connection that could mean half the achievable speed is lost.
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Gentlefolk,
However if you've just had a VDSL installation done by a contractor without the required "pair quality test" instrument, together with two NTE5s in series being overlooked, the result can be around 9 Mbps instead of over 25 Mbps.
Caveat emptor is a bit difficult when you can't officially see the actual line's performance.
Kind regards,
Walter
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by the way I will also add to this that on average once every 3 days or so I had a burst of crc errors on my hg612 modem, I now know I am on a ECI dslam so it may be for the same reason as otherwise the connection was stable with very low crc count outside of these short bursts.
It is dissapointing tho that a hg modem can outsync a eci modem on a eci dslam. Which suggests anyone on a eci dslam may be at a disadvantage to those with a hg to hg combo. I was hoping getting a eci modem for my eci dslam may bump my attainable sync up (which has lost 40mbit in 2 weeks).
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Right... after a month DLM had brought my speed up from an IP profile of 50.4ish to 54, so i thought i'd try a reset of the modem. Brought profile down to 49.64.
So it appears a Huawei on a ECI cab is a bit skittish about manual modem resets and prefers to let DLM do things.
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Did you reset the modem at a time of day when SNRM & thus attainable rates would have been at their highest (say around noon), or at their overnight lowest (say around 23:00)?
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It was a midday reset.
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Okay.... after quite a long time the results are (from simple BT wholesale speedtests for IP profile):
i) The Huawei sticks at ~51 Mbps sync mark it didn't seem to want to re-sync at a higher speed.
ii) The ECI after reconnection last month was at 49 Mbps, but after a few weeks has re-synced to 57 Mbps.
So there does seem to be some relationship between the cab and router.
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Don't think my line has ever re-synced when I've been using the HG612 not even downwards...
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Just sharing some experience.
I appear to have a rather noisy line, there is an electrical substation right next to the ducts leading to my street. Most probable that there is noise coming off a variety of appliances/gadgets in the house too.
Using the google maps measuring tool i get 350 m between me and the cab.
Using the ECI modem i get a 47-51 IP profile and with the Huawei i get 52-54 IP profile.
Huawei gives me a ~62-64 Mbps max.
So it appears the Huawei deals with noise a bit better than the ECI modem.
cheers,
Stan
Sorry to dig this up, but how are you getting the stats? :)
I have a Huawei FTTC VDSL and a Technicolor TG582n FTTC
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Soooo....
Had a complete failure of my service and BT engineer effected a repair. Card failed, moved to new ports and back to IP Profile of 68.8 which has been solid for over 4 weeks now... so it looks like my past degradation of service wasn´t noise/crosstalk, but hardware at cab.