Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[licquorice]

Oh, that's a new thing I've learnt today. Where does the fibre come from to the exchanges though? I presume the head exchange feeds the other sub exchanges?

http://www.kitz.co.uk/adsl/21cn_network.htm

[William Grimsley]

Thank you, licquorice (apologies for earlier).

Now it makes sense!

[MaximusPrime]

@NewtronStar,

my DSL Stats showed I had 20+ disconnections yesterday but when I rang BT Retail they said they had only 5 recorded which was strange.

The down time for turning off the electricity I couldn't help but I had already booked another Engineer before that.

Rained a bit lightly there, SNR dropped a bit, FEC's dropped a lot, stopped raining now though

Edit: I turn off my Linux DSL machine at night because of fire hazard but the router is left on

[William Grimsley]

Fire hazard? I leave my PC on most of the time!

[MaximusPrime]

@William Grimsley,

it's a 10 year old machine, I don't like having machines left on overnight while I'm asleep just in case.

When I eventually get a Raspberry Pi I'll leave it on, I'll get a fire alarm for my office too

[MaximusPrime]

Question: could some of the FEC's on my line be caused due to the Wireless on my router?

No Engineer arrived today but my line has been ok so far...

Edit: I said there was no FEC's when the wifi lost connection but that makes sense due to no wifi connection

[j0hn]

FEC's are simply potential errors that were corrected before they became errors. They are perfectly normal, especially with how your line has been. dlm has turned on error correction on your line. you had over 30 resyncs in the last 2 days dlm is making quite a few changes to your line to try stabilise it.

[MaximusPrime]

The Engineer didn't show up yesterday

Things were going well until now; Down to 1.8Mb

[William Grimsley]

I'm surprised DLM took action so quickly, I can't really see why your Downstream SNR Margin should be that high?!

I mean, there was nothing wrong with your line before the resync, what is also odd is that G.INP has been enabled on Upstream too!

To now say your line is dropping out with such a high SNR Margin is really strange.

[NewtronStar]

I mean, there was nothing wrong with your line before the resync, what is also odd is that G.INP has been enabled on Upstream too!

G.INP for Huawei cabinets on the upstream has not gone away it's just not used as the default these days until a line is having serious issues 

[William Grimsley]

Yeah, I knew that, that's why I was a bit worried.

[j0hn]

The Engineer didn't show up yesterday

Things were going well until now; Down to 1.8Mb

CRC's are pretty irrelevant also. More important, and more serious a problem is the Error seconds. you had over 2000 Error Seconds in the space of 2 hours. This was accompanied by over 500 Severely Error Seconds (even worse than ES). that will by your line resynced and came back with so low a sync. It's now back up to 9mb.

Make sure to show the engineer your snrm graphs. Clearly there's a problem on your line, that's very intermittent.

[MaximusPrime]

@j0hn,

cheers for your analysis, are ES & SES not caused by FEC's & CRC's?

If not what causes them?

[Dray]

It's all documented here http://www.kitz.co.uk/adsl/linestats_errors.htm

Noise is often the cause of problems

[burakkucat]

CRC's are pretty irrelevant also.

That surely has to be a typo in j0hn's post.

CRCs are very relevant. CRCs are responsible for the ES and the SES.

However FECs are less relevant as they are "CRCs that didn't happen" due to the intervention of the error correcting mechanisms.