Bald_Eagle1

Just received my Huawei Hg612 and decided to use the nice graphing tools you folks have put together.

http://i.imgbox.com/aaccWye9.png

I'm ~400m from the cab. When the engineer came to do the install he showed me the JDSU and it was reading around 120,000 kbps max.

However, what I'm seeing now is ~62,000 kbps. So i get the feeling that something has gone awry.

Your comments and experience appreciated.

http://www.thinkbroadband.com/guide/fibre-broadband.... still pretty good.

Chances are that others have got connected now, so crosstalk is cutting speed back

next time i see an OR engineer fiddling in the cab i'll ask how populated it is. It's only been live since march.

The DSL checker is reporting 59 Mbps speed, which i've taken normally as being pretty conservative. So getting 47-52 IP profiles seems somewhat low.

It's possible that other people have been connected to your cab, resulting in crosstalk and a reduction in your max attainable rate. What does the BTW checker say you should expect?

Edit: Posts above showed up a bit late!

Edited by mysticeddy (Tue 15-May-12 15:19:14)

In reply to a post by TheManStan:

Your comments and experience appreciated.

I'll comment, but my experience is only really of my own [censored] connection

Your band plan suggests you were intitially provided with the ECI modem as you are connected to an ECI DSLAM cabinet.

This MAY explain why you are currently seeing lower Attainable rates, due to a slight mismatch between the Huawei HG612 modem & the ECI DSLAM.

You don't have much spare SNRM, so it appears that's all you are likely to achieve, unless a physical fault has increased your line attenuation values.
I'm still not sure what attenuation values to expect for various distances & having attenuation split over a few bands doesn't really help matters.

If nothing has actually deteriorated, it would suggest that the initial JDSU reading of 120,000 kbps may have been a spurious result.

Proving any of this is almost impossible as you were unable to log your own stats, using your own equipment when FTTC was first installed.

I would have expected QLN to be closer to -130 or -140 dB.
You may just have a generally noisy line, or suffer really badly from crosstalk.

Graphing the Ongoing stats 24/7 for a few days may provide additional pointers as to what's up. e.g. massive bursts of errors, dropping SNRM levels, or many re-syncs etc.

DS Interleaving depth of 869 also seems high. Mine is less than 500 over somewhere between 820m & 1000m from the cabinet.
This again suggests high error counts and/or noise levels.

How long have you actually had a FTTC connection?

Not much help really. Sorry.
A prolonged period of stats data may give some further clues.

EDIT:
Just noticed, you have only been connected since March

Edited by deleted (Tue 15-May-12 17:59:30)

Thanks for your comments.

You're correct with respect to the ECI cab and modem. The lack of stats made me consider, then buy the huawei modem (which I received today). The IP Profiles were those obtained with the ECI modem, which are similar to that i have with the Huawei (in fact the Huawei gives me slightly higher sync).

People in the Oxfordshire area, e.g. Didcot which has been live longer, which in theory would be fuller cabs show higher sync speeds ~70 Mbps at identical distances.

Something i noticed on a walk towards the cab, is that the ducts pass right next to what appears to be an electrical sub-station. This just adds to potential sources of noise... maybe if I find out if any of my immediate neighbours have FTTC and have the same sync speeds I'll be better placed to see if it's a local phenomenon or just my connection.

In reply to a post by TheManStan:

Something i noticed on a walk towards the cab, is that the ducts pass right next to what appears to be an electrical sub-station.

Thanks for mentioning that 'TheManStan', I have taken a few walks to my FTTC cab and, until now I never gave a thought to the electrical sub-station 'brick shed' that I have walked right past each time. I estimate I'm a similar distance to you ~450m and get 62400 down and 20000 up sync (not bad but some have better at that distance).

Al1264

is 62400 your attainable rate or your max rate?

Both, they're currently identical.
Upstream I get an attainable rate of 32Mb though which seems very good for my distance.

Now a bit more disappointed...

http://www.daftlogic.com/projects-google-maps-distan...

used this to calculate distance to cab and it's 350m following the ducts along the roads.

This means that there is either a hell of a lot of noise from whatever sources or there is something screwy with my line.

Tried the ECI modem again and it gives a lower IP profile. So it seems that the Huawei is better at dealing with noise.