Kitz Forum

Broadband Related => FTTC and FTTP Issues => Topic started by: andyfitter on October 31, 2016, 12:17:40 PM

Title: "One Leg Dis" Fault?
Post by: andyfitter on October 31, 2016, 12:17:40 PM
Received an email from MDWS saying my line had resynced - First time in about 130 days. Sync dropped from around 72/20 to 30/3. Phone line dead too.

Raced to the end of the road to find an Openreach bloke closing up the cab. Asked him if he could have disturbed anything and he seemed sceptical but said he'd take a look.  Gave him my phone number, and he said it was marked as a spare number and not in use? I've had this number for 3.5 years now. Was originally allocated by BT but is now with Sky. Because of that he said there was no way for him to trace it in the cab? With that, he got back in his van and drove off.

Just spoke to Sky and they confirm it is an external fault. I guess the BT database isn't up to date. However, if he did disturb something in the cab, how is the next engineer going to be able to fix it if my number and line is flagged as spare?

If anybody would like t see how badly my stats have plummeted, my MDWS username is andyf

Andy.
Title: Re: "One Leg Dis" Fault?
Post by: 4candles on October 31, 2016, 01:26:10 PM
Certainly has all the hallmarks of 'dis one leg', with crippled broadband and no phone.


Also seems beyond coincidence that there was work going on in the cab.


I'd just report it as normal - if necessary the attending OR engineer will tone out the pair from the exchange and/or your premises.
Title: Re: "One Leg Dis" Fault?
Post by: tommy45 on October 31, 2016, 05:21:14 PM
Hmm he must have disconnected one of the D'side pair otherwise the VDSL service wouldn't have been impacted (E side voice service  not required for FTTC to work)
Title: Re: "One Leg Dis" Fault?
Post by: andyfitter on October 31, 2016, 05:39:35 PM
He tried to tell me that "Sky must have disconnected me" as that's the only reason the phone number would be flagged as 'spare'. Not quite sure how that corresponds with my FTTC still working, albeit much degraded.

Think he just didn't want to linger and fix a problem of his own making when somebody else could do it for him.

Sky reckon it could take up to 5 working days to fix?!?
Title: Re: "One Leg Dis" Fault?
Post by: anfield_92 on October 31, 2016, 09:10:35 PM

Raced to the end of the road to find an Openreach bloke closing up the cab. Asked him if he could have disturbed anything and he seemed sceptical but said he'd take a look.  Gave him my phone number, and he said it was marked as a spare number and not in use? I've had this number for 3.5 years now. Was originally allocated by BT but is now with Sky. Because of that he said there was

In order for us to test lines we need the circuit ID - for BT lines this is the phone number, but for LLU lines it is something different. If we try to test an LLU line using the phone number it is the same as trying to test a number that doesn't exist, and the system will return a spare line error. When a fault is raised the circuit ID will be included in the job notes so whoever is allocated the job will be able to test the line.
Title: Re: "One Leg Dis" Fault?
Post by: andyfitter on November 01, 2016, 09:04:31 AM
Thanks, that makes perfect sense. Mentioned to the engineer at the cab that I was on a Sky connection but he didn't seem to realise it would make a difference.

Maybe he was new, or in a hurry for his lunch :-(
Title: Re: "One Leg Dis" Fault?
Post by: milgo on November 01, 2016, 11:28:52 AM
@andyfitter Ė If it helps you any I recently had what sounds like an identical fault to yours, phone completely dead and Sky fibre max speed download speed dropped from 72Mbps to 25Mbps

I originally logged the fault with Sky on the 26th October and after running a test on the line they advised that they were seeing a disconnect in the network and would pass the fault out to Openreach to get it fixed.  They quoted me 3-5 working days for this to be resolved. On day 3 I called Sky back as the fault had still not been fixed and they told me that the fault had been rejected by the Openreach system so had not been progressed.  Sky re logged the fault for me on 29th October and the phone fault was cleared at about 9:30 on the 31st October.

My fibre download speed remains at 25Mbps currently although I can see (HG612 modem) that the max attainable speed is just shy of 78Mbps.  Sky have told me that my speed will recover although Iím not sure how long this will take.

So if I were you, if you havenít already done so I would check that the fault that you have reported is in fact being progressed by Openreach
Title: Re: "One Leg Dis" Fault?
Post by: andyfitter on November 01, 2016, 05:30:48 PM
Thanks. They quoted 3-5 days to me too. One thing in my favour is that he logged the fault with Openreach whilst I was on the phone, and it was accepted by the system, so hopefully all is in place for it to be fixed.

If still broken in a couple of days I'll chase them. Strange you are still stuck on the lower speed though. I would have assumed a DLM reset would occur once the fault was fixed. Maybe its down to the engineer if he thinks it is worthwhile.

Title: Re: "One Leg Dis" Fault?
Post by: milgo on November 01, 2016, 10:42:15 PM
Please update us once your phone is working again as I'll be interested to hear what has happened to your download/upload speeds

Sent from my SM-G920F using Tapatalk

Title: Re: "One Leg Dis" Fault?
Post by: andyfitter on November 01, 2016, 10:53:48 PM
Sure, will do.  My last 4 months or so of stats are on MDWS too so the evidence will be there for all to see.
Title: Re: "One Leg Dis" Fault?
Post by: milgo on November 02, 2016, 08:35:43 AM
Update: my connection (Username: milgo on MDWS) resyncíd this morning at 4:58 with RDI given as the reason so I presume that it was DLM doing its thing. Iím obviously happy that the speed is heading back up although I am a little surprised that it has happened so quickly.  I am now in sync at 60/20 with SNR of 9.2/11.1 so again I presume that there is a higher downstream sync speed to come as the SNR moves down toward 6.

An interesting observation that Iíve not noticed before is that the sync speed reported by the HG612 is different to that reported by the Sky hub 3...

HG612 Ė 60000/20000
Hub 3 Ė 57414/19139
Title: Re: "One Leg Dis" Fault?
Post by: j0hn on November 02, 2016, 10:02:47 AM
With the SNRM down of 9.2 and current sync at exactly 60000 the lines appears to be banded at this moment. Hopefully it will resolve itself. If you do get an engineer visit I would be asking for a DLM reset.
Title: Re: "One Leg Dis" Fault?
Post by: milgo on November 02, 2016, 10:10:10 AM
Thanks j0hn,

I don't suppose you would know if there is an easy way for me to confirm or deny what you are thinking regarding the banding?

You also mention that it could sort itself out!  Is there any timeframe that i could work to to keep an eye out for this?

Thanks
Title: Re: "One Leg Dis" Fault?
Post by: j0hn on November 02, 2016, 10:25:35 AM
If after another resync it's still 60000 or 59999 then it is banded (fixed, won't go above). Recent reports of banding have unfortunately usually stuck permanently, requiring a DLM reset. My advise would be to power down the modem for 30 minutes and reconnect, checking the sync again. If it's still exactly 60mb then don't close the fault and request an OpenReach engineer for a broadband fault.
Title: Re: "One Leg Dis" Fault?
Post by: andyfitter on November 02, 2016, 10:31:13 AM
Engineer came and everything pointed to the one leg fault as predicted. Spent nearly an hour at the cab and came back looking puzzled.

He now thinks my fibre port has gone faulty and that can take down the phone line too.

So I now need another from a 'broadband engineer' to dig around in the other cab and move me to a new port.

I do at least have a working landline now. Maybe I'll dig out my old US Robotics modem :-)
Title: Re: "One Leg Dis" Fault?
Post by: andyfitter on November 03, 2016, 10:15:26 AM
Broadband engineer been, was a faulty port. Not sure if he fixed it or just moved me to another. He's done a DLM reset and I've it looks like I've had G.inp removed.

Syncing at 72/20 as previously. Stats on MDWS as andyf
Title: Re: "One Leg Dis" Fault?
Post by: burakkucat on November 03, 2016, 05:46:47 PM
I suspect that your circuit has just been moved to a different port on the line-card. (Or if there was no spare port available, the line-card was swapped out.)

Given time, the DLM process should eventually re-enable G.998.4 (G.Inp).
Title: Re: "One Leg Dis" Fault?
Post by: milgo on November 03, 2016, 07:43:57 PM
My connection resyncíd again this morning, this time at 8:11 again with RDI given as the reason.  The actual sync stats have remained the same at exactly 60/20 so as advised by j0hn it appears that my line has become banded. I need to move a few things around at home tomorrow and that will give me the opportunity to power off the HG612 ( I will ensure that it is off for between 31-44 minutes) just to see if that has any effect on the actual sync speed.  If it does not then I will raise a broadband fault with Sky...hopefully to get a DLM reset done on the connection.

@andyfitter Ė great to see that you got your fault sorted and that you have got your full D/U speed back.  Just something that I noticed between our respective actual sync graphs is the way that when the fault was resolved my speed increased vertically whilst yours goes up in a gentle slope!
Title: Re: "One Leg Dis" Fault?
Post by: andyfitter on November 09, 2016, 09:56:54 AM
Resynced overnight and G.Inp is now back. Im also now syncing at about 5Mb faster than ever before, from around 72 for the last year or so up to 77 now.

Title: Re: "One Leg Dis" Fault?
Post by: milgo on November 10, 2016, 05:13:20 PM
Well Andy you are flying now! I notice that our line stats are very similar apart from the extra 4Mb d/s that you have managed to achieve.
Title: Re: "One Leg Dis" Fault?
Post by: andyfitter on November 10, 2016, 06:59:33 PM
Well Andy you are flying now! I notice that our line stats are very similar apart from the extra 4Mb d/s that you have managed to achieve.

Yep, it's been a really good outcome having been steady at somewhere between 68 and 72 for the last 3 years since I moved here.

Wouldn't have thought that moving me to a new port would make any real difference, maybe I'm now on a different tie pair with less crosstalk. My attenuation has also dropped very slightly which I guess would help, although again Im not sure why that would happen as my line length hasn't changed.
Title: Re: "One Leg Dis" Fault?
Post by: Black Sheep on November 11, 2016, 06:14:56 PM
Thanks, that makes perfect sense. Mentioned to the engineer at the cab that I was on a Sky connection but he didn't seem to realise it would make a difference.

Maybe he was new, or in a hurry for his lunch :-(

It matters not which LLU ISP you are with, as OR we only have access to classic BT owned circuits via our CSS database.

You'll have noticed how many wires are in those Cabinets, we need to know the dedicated routing from your ISP in order to identify 'your' connections manually, or to employ a 'Remote tone' which generates an audible noise that we can then identify.

However, as you have since found out, the issue was nothing to do with the engineer you spoke with and we can't be spending time looking at every EU's problems as they pass us when we're working, we simply haven't got the time. The simplest way is to ring your ISP immediately you encounter an issue