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[S.Stephenson]

Ages ago I posted about how my line went through trees and was causing problems, well today I finally got it sorted and as a result my line length decreased by around 150m.  Original:http://forum.kitz.co.uk/index.php/topic,15807.0.html

There has been 1 immediate improvement in my upload speed but other than that only line attenuation has fallen a bit.

Line stats before:


Line stats after: Engineer said it was 298m to the DP, so overall was around 340m tops.


Anyone think i'll get any further improvements, it doesn't look like it to me.

[Weaver]

Apologies I have a mental block about this, what is a DP?

[S.Stephenson]

Apologies I have a mental block about this, what is a DP?

Distribution point basically the pole in which the drop wires come from.

[Weaver]

The pole nearest the house?

[S.Stephenson]

DP can be anywhere it is the one with thick cables going up it, but lines can be fed forward onto feeder poles like mine was, and as a result of getting the line sent directly from the DP instead of via a feeder pole it knocked 100-150m off of my line length.

[Weaver]

Ah, sorry, I failed to notice the S on drop wires. Now I understand.

[burakkucat]

I see --

Before

Data Rate: 13904/60556
Max Data Rate: 14067/60145

After

Data Rate: 16994/61557
Max Data Rate: 20958/61744

So the circuit has gone from 60.6 Mbps DS / 13.9 Mbps US to 61.6 Mbps DS / 17.0 Mbps US. You may see a little but more once the circuit has had some time to "settle" and the DLM makes adjustments but basically I would say that is probably the best you'll get. 

[S.Stephenson]

Does it look like my noise margin target has been set to 6.6db due to poor stability?

Best case after a few weeks DLM might get rid of interleaving(if i even have it), and noise target will go back to 6db.

[burakkucat]

I am fairly certain that your target SNRM is set at 6 dB.

Remember that the SNRM varies dynamically according to the prevailing conditions. In four hours time you might see it at 5.9 dB . . .

[S.Stephenson]

Was just thinking it was a possibility since I only ever see it at 6.6db.

That and 62Mb/s seems a tad low with 14.1db line attenuation.

But mainly it's got it out of the way off a tree, as long as it stops my daily disconnects i'm perfectly happy, the upload boost was a great bonus as that's something i'd actually notice day to day.

Just need g.inp and thats my lot until they roll out g.fast.

[WWWombat]

The difference between "data rate" and "maximum data rate" on upstream, while the SNRM remains close to 6dB, suggests that DLM has indeed intervened there - so some gains may appear in time.

The lack of a difference on downstream suggests there isn't the same problem there, and no obvious gain to come.

However, my usual rule of thumb for a line around 60Mbps is that 3dB is worth around 8Mbps downstream. If attenuation decreased by 4dB, and there were no change in the noise at the same time, you'd expect speeds to have increased around 10Mbps.

I also wonder why DLM would have intervened upstream, but not downstream. That would be a little strange, ordinarily. Are you sure G.INP isn't already active?

[burakkucat]

Are you sure G.INP isn't already active?

Surely we would need to know what is the fibre cabinet's hardware -- Huawei or ECI -- and we would have to also remember that the CPE currently in use is a BT HH5A . . . 

[S.Stephenson]

Have an ECI cabinet unfortunately, I've been considering an TP-LINK Archer VR900 as it should support my BT Youview.

A really funny thing about the install was it required drilling in a loft cabinet and I had to do it due to some working on confined spaces thing, also had to jump neighbors fences with the wire.

Guy was great though he went on the routing thing to tell me that the line to the DP was 298m, should have asked for a dlm reset but I suppose I'll go the long way round.

[NewtronStar]

should have asked for a dlm reset but I suppose I'll go the long way round.

I think your engineer would not be qualified to recalibrate/DLM reset your line as it sounds more like a network engineer rather than a broadband engineer.

[WWWombat]

Surely we would need to know what is the fibre cabinet's hardware -- Huawei or ECI -- and we would have to also remember that the CPE currently in use is a BT HH5A . . . 

A long shot, certainly. But it isn't often we see DLM on the upstream alone, either.