Kitz Forum

Broadband Related => FTTC and FTTP Issues => Topic started by: cwaite on September 13, 2017, 09:11:07 PM

Title: Moving to a better set of Pairs
Post by: cwaite on September 13, 2017, 09:11:07 PM
When I joined plusnet in 2013 I was told I would get an estimated speed of 40mbps (accurate to +/- 1mbps), however today I am getting a sync of 20.7mbps (this has dropped from 25mbs in the last few months), however, my next door neighbour is getting 38.1mbs (increased from 34mbs in the last few months), he is connected to the same cabinet as me, and his dropcable runs along side mine to the Pole across the road.

Plusnet are trying their hardest not to help, just saying that Openreach have changed their estimates and I've got to just live with the speed I am getting however, I am not happy living with half the speed I was expecting, especially knowing nextdoor has near enough the speed I was expecting.

If I can get Plusnet to send out openreach, would it be easy for Openreach to find out which set of pairs, my next door neighbour is connected to and then if there is any spare usable capacity on the set of pairs he is connected to then connect me to the same set of pairs (sorry I dont know what they call the cable that houses the multiple pairs). I am sure my neighbour will allow Openreach access to his master socket if they need to check anything from that.
Title: Re: Moving to a better set of Pairs
Post by: RealAleMadrid on September 13, 2017, 10:22:53 PM
There aren't sets of pairs that are better or worse, you just get one pair of wires back to the cabinet and Openreach will never try and find the best one for you, everyone wants the best but it could all change if another FTTC line is enabled and hits you with crosstalk so you have to take what you've got unfortunately. you neighbour is lucky to have a good speed.
Title: Re: Moving to a better set of Pairs
Post by: cwaite on September 13, 2017, 11:07:36 PM
So from what you are saying there is just one cable with many sets of pairs that run from the DP to the pole? I was told by an Openreach engineer that there were various cables which contained sets of pairs and they could only connect a certain number of people to each sets of pairs to reduce crosstalk. Did the Openreach engineer feed me a load of bull?

Title: Re: Moving to a better set of Pairs
Post by: RealAleMadrid on September 14, 2017, 07:51:34 AM
There could be a number of multipair cables at the DP but I pretty sure Openreach can do nothing to reduce crosstalk as it caused by interference from cable pairs in close proximity in the cable bundle. Also the cable back to the cabinet may well be a single multipair cable which is likely to be longer than the DP to property distance and the engineer can do nothing about that.
Title: Re: Moving to a better set of Pairs
Post by: Black Sheep on September 14, 2017, 11:17:35 AM
There aren't sets of pairs that are better or worse, you just get one pair of wires back to the cabinet and Openreach will never try and find the best one for you, everyone wants the best but it could all change if another FTTC line is enabled and hits you with crosstalk so you have to take what you've got unfortunately. you neighbour is lucky to have a good speed.

Not strictly true.

It depends on where you're own pair of wires are, (within the large cable carrying all the cable pairs), in relation to other pairs that are connected to broadband (DSL).

If for example, your 'pair' is to the left of the cable and only surrounded by EU's who have just telephony service (PSTN), then your X-Talk levels wouldn't be as impactful as a 'pair' connected in the right-hand side of the cable that is surrounded by circuits all carrying DSL.

But, you're right in as much as the 'pair' is the 'pair you are connected to, it would be extremely unusual to try and source a 'quieter' pair within the cable, as this sets a precedent and before long all the right-hand side circuits would get moved to the left and the same scenario occurs. This is why BB is a legacy product in laymans terms. For the most part, whatever pair you were connected to pre-broadband will be the pair you stay with.

 
Title: Re: Moving to a better set of Pairs
Post by: cwaite on September 14, 2017, 05:11:27 PM
Do you think crosstalk would have that much of an effect on my broadband, my next door neighbour is syncing 38.1mbps and I am syncing at 20.4mbps, we are definitely both connected to the same cabinet, so I guess we are in the same large cable carrying all the pairs.

PlusNet are trying to arrange an Engineer visit, please could someone have a look at my line stats and tell me if they can see anything obvious to why I am not getting near to my neighbours speed (or the speed I was originally told I would get).

From HG612 Stats logging Program (see link below)
https://1drv.ms/f/s!AuuoQtRhe-fgnpcUbNTgTZ4GAujtlg (https://1drv.ms/f/s!AuuoQtRhe-fgnpcUbNTgTZ4GAujtlg)
Title: Re: Moving to a better set of Pairs
Post by: j0hn on September 14, 2017, 05:33:27 PM
Your line is banded (capped) at 22.4Mb
If it wasn't then you would get around 27Mb
It needs an OpenReach engineer to do a DLM reset to remove the banding.
Title: Re: Moving to a better set of Pairs
Post by: ejs on September 14, 2017, 07:55:13 PM
And if nothing else was changed, wouldn't you expect the DLM to return to how it was before the reset?

Are people still using Openreach HG612 modems? How long do you expect them to last?
Title: Re: Moving to a better set of Pairs
Post by: j0hn on September 14, 2017, 08:43:54 PM
Banding tends to be applied due to repeated resyncs in a short period of time, either manual resyncs or the cause of a line fault/faulty hardware. DLM sees both the same.

How long has the line been syncing at the same figure of 22.4Mb? It should remove itself, often in stages. We see it "stick" quite often though. That's when OpenReach need to perform a DLM reset. Unless the line has a fault or you have a faulty modem then it shouldn't apply banding again.

The Huawei HG612 is still a well used modem. Granted some will have been in their box for a period of time and purchased on eBay but there's many been running perfectly for years.

There are other chipsets/patch cables that might help the OP sync a little higher but until the current banding is resolved there's not much point pursuing this.

thought I was replying to the OP, edited a little
Title: Re: Moving to a better set of Pairs
Post by: cwaite on September 14, 2017, 09:08:46 PM
Its been like this for around 7 days I think, the sync rate has been falling over the past few months.
Title: Re: Moving to a better set of Pairs
Post by: ejs on September 15, 2017, 07:18:29 PM
How long has this particular HG612 been in use for? These type of things are probably built for a life expectancy of about 5 years. Has another modem/router been tried?

If it's been working fine for years, is that supposed to imply it will continue to work fine forever, or that it's now getting old?

Which order are things supposed to be done in, try another modem first, or get Openreach out first?
Title: Re: Moving to a better set of Pairs
Post by: cwaite on September 17, 2017, 01:10:27 PM
Yes I do have a Netgear D6220 which was originally plugged in when the sync started dropping, I have plugged my HG612 back in as I can get better stats from this.
Title: Re: Moving to a better set of Pairs
Post by: cwaite on September 17, 2017, 01:14:27 PM
Not strictly true.

It depends on where you're own pair of wires are, (within the large cable carrying all the cable pairs), in relation to other pairs that are connected to broadband (DSL).

If for example, your 'pair' is to the left of the cable and only surrounded by EU's who have just telephony service (PSTN), then your X-Talk levels wouldn't be as impactful as a 'pair' connected in the right-hand side of the cable that is surrounded by circuits all carrying DSL.

But, you're right in as much as the 'pair' is the 'pair you are connected to, it would be extremely unusual to try and source a 'quieter' pair within the cable, as this sets a precedent and before long all the right-hand side circuits would get moved to the left and the same scenario occurs. This is why BB is a legacy product in laymans terms. For the most part, whatever pair you were connected to pre-broadband will be the pair you stay with.

 

Do you think that you could have 2 pairs (i.e Mine and my neighbours) within the same set of pairs and crosstalk would cause the 2 different pair to have such a difference in sync speed (i.e mine syncs and 22.4mbps my neighbours syncs at 38.1mbps), or would you think that my neighbour is likely to be connected to a different set of pairs at the DP?
Title: Re: Moving to a better set of Pairs
Post by: Black Sheep on September 17, 2017, 01:30:24 PM
I wouldn't know for absolute certain, as my job doesn't allow me to check all pairs within a binder (cable), and cross-reference.

Using my own premises as my only reference, having been responsible for making my neighbours aware of, and subsequently purchasing FTTC products, I can say we're all pretty much the same in terms of speed. We are a group of 5 houses in a cul-de-sac approx. 600mtrs from the Cab. All new 0.5 Cu wires.

If you are in the same cable from Cab to DP (Pole), then I would say the difference you are seeing is not normal. But we would need to be sure you are in the same cable, and also is your neighbour on the 80Meg product and you're on the 40Meg product ?? 
Title: Re: Moving to a better set of Pairs
Post by: lee111s on September 17, 2017, 01:33:16 PM
40/10 or 80/20 wouldn't make a difference if his line appears, at the moment for whatever reason, capable of way less than 30.

I think the OP needs another engineer visit.
Title: Re: Moving to a better set of Pairs
Post by: shadow4dog on September 17, 2017, 01:45:21 PM
My brother had an issue with his line back in the days of ADSL. He could only sync at 1Mb/s Max, whereas his neighbor could get 7Mb/s. We called BT out two or three times and they swapped E side pairs before they gave up and said that was all they could do.
We decided to order a second line and this line synced at 7Mb/s! Then fibre came... we put it on the BT line and it synced but had a huge number of errors way below the bottom estimate for his line. So we then put FTTC on the second line and unsurprisingly it synced at the rate that had been quoted.
My point is that Openreach could have swapped the pair to the CAB but refused and only a new order got us the speed we have today.

Thanks
Tim
Title: Re: Moving to a better set of Pairs
Post by: Black Sheep on September 17, 2017, 01:50:59 PM
40/10 or 80/20 wouldn't make a difference if his line appears, at the moment for whatever reason, capable of way less than 30.

I think the OP needs another engineer visit.

I'm not saying that. I'm asking the question is his neighbour on the 80Meg product, and he on the 40Meg product. The OP is obviously using his neighbour as a yard-stick for his own circuits performance.

I do agree he needs an engineering visit and should be offered one by his ISP, with that drop in speed.
Title: Re: Moving to a better set of Pairs
Post by: Black Sheep on September 17, 2017, 01:58:18 PM
My point is that Openreach could have swapped the pair to the CAB but refused and only a new order got us the speed we have today.

Thanks
Tim

We don't 'refuse' to change pairs. We are not in the business of throwing a load of chicken-bones on a table to see 'what they tell us to do'.

We have a set of parameters to which we work to. If the tests pass within the 'cone of acceptance', then we are asked not to undertake speculative changes.

Of course, there are variables as to the 'experience' the end-user gets with the Openreach engineer. Intermittency of the fault, inexperienced engineers, local knowledge ... being the main players.
But we don't just 'refuse' to change pairs because we feel like it.
Title: Re: Moving to a better set of Pairs
Post by: cwaite on September 17, 2017, 02:33:57 PM
I wouldn't know for absolute certain, as my job doesn't allow me to check all pairs within a binder (cable), and cross-reference.

Using my own premises as my only reference, having been responsible for making my neighbours aware of, and subsequently purchasing FTTC products, I can say we're all pretty much the same in terms of speed. We are a group of 5 houses in a cul-de-sac approx. 600mtrs from the Cab. All new 0.5 Cu wires.

If you are in the same cable from Cab to DP (Pole), then I would say the difference you are seeing is not normal. But we would need to be sure you are in the same cable, and also is your neighbour on the 80Meg product and you're on the 40Meg product ??

We are off the same pole (there are 8 drop cables from the pole we are on going to different properties) so I would guess that there is only 1 cable going to the pole.

The way I think our cables run is that it goes from the Cab (approx. 650m away) to an Underground Manhole at the entrance to our estate Which has 3 manhole covers (approx. 200m away) then to the Pole which is across the street then to the properties.

The manhole looks like the attached photo but has 3 covers, I guess this seems to be some kind of junction as its at the entrance to our estate and this is where most of the engineers head to when there is a problem.

Its actually the other way round I am on a 80/20 product and my neighbour is on a 40/2 product! However, I think PlusNet at one time said they would move me to a 40/10 product as it could result in me getting a better speed, but this didn't seem to make any difference.

My biggest complaint is that I was told and originally had a speed that would meet my Internet Needs, I now have an inferior speed which means that I can no longer watch 4k shows on Netflix (I bought two 4k TV's to enable me to watch 4K Netflix, these can now not be used to their full potential), I also have a NAS drive whereby I can access my files remotely, my upload speeds have reduced to half of what they originally were and it takes ages to download large files remotely, I also have IPTV and can no longer watch in HD on more than 1 TV at a time. Along with CCTV Cameras, VOIP and Nest Heating and Internet connected plugs, I have invested quite heavily in making my home internet connected to now find that I am unable to use these services as freely as I once could.
Title: Re: Moving to a better set of Pairs
Post by: cwaite on September 17, 2017, 02:49:45 PM
On a side note, we had a powercut around 10am this morning for around 2 or 3 seconds, thankfully I have a UPS but the graph from HG612 stats (see attachement) shows that when the power went off my attainable rate went up to around 32mbps, I am guessing not many other people will have a UPS so even eradicating the crosstalk I am not getting near to my neighbours 38.1mbps.
Title: Re: Moving to a better set of Pairs
Post by: Black Sheep on September 17, 2017, 02:54:40 PM
For info purposes only, the 3-lid manhole is a JF10 (Jointbox Footway No.10). The more lids, generally indicates the busier the box, ie: more cables and cable joints.

As mooted previously on this thread, you definitely need an engineering visit.  :)
Title: Re: Moving to a better set of Pairs
Post by: cwaite on September 17, 2017, 04:25:41 PM
Yes Plusnet have asked me for some dates for an OR visit, just waiting for them to confirm the dates.

I am trying to gather some info and ideas for what could be done to try and get me a similar speed to my neighbour, unfortunately I have been fobbed off by many Openreach engineers in the past.

I assume that there would be several sets of pairs coming from the Cab to the JF10 box, then the cables go off in different directions to several poles, on of which goes to the pole I am connected too! Am I correct in thinking this?
Title: Re: Moving to a better set of Pairs
Post by: burakkucat on September 17, 2017, 08:55:22 PM
I assume that there would be several sets of pairs coming from the Cab to the JF10 box, then the cables go off in different directions to several poles, on of which goes to the pole I am connected too! Am I correct in thinking this?

Think bigger and "scale up". Typically there are a number of multi-pair cables from the cabinet to various joint boxes. Eventually there will be one (sometimes more) cable(s) that will link a joint box to a pole. One (or more) cable(s) then ascend the pole to one (or more) DP(s) at the top of the pole.

From your description of just eight aerial drops from the pole-head DP, I suspect that if you go and study the pole in question you will see just one tail cable, from the DP, down the pole & then underground.
Title: Re: Moving to a better set of Pairs
Post by: WWWombat on September 17, 2017, 09:46:05 PM
Think bigger and "scale up". Typically there are a number of multi-pair cables from the cabinet to various joint boxes.

Here, for example, is a diagram of one route out of a cabinet. The ducts can carry multiple cables; those on the D-side out of the cab will vary from having 100 pairs down to 10 pairs. The larger cables are more likely nearer the cab, and the lesser ones further away.
Title: Re: Moving to a better set of Pairs
Post by: cwaite on September 17, 2017, 11:25:50 PM
Thanks for all this information it's all really helpful, would you think based on the difference in speed between myself and my neighbour that there is more than one multi pair cable going to the bottom of the pole that we are connected too? Also would you agree that it's likely that I am connected to one multi pair cable and my neighbour is connected to another?

Yes @burakkucat There is just one tale cable going down the pole.
Title: Re: Moving to a better set of Pairs
Post by: burakkucat on September 18, 2017, 01:00:36 AM
Yes @burakkucat There is just one tale cable going down the pole.

Thank you. That is useful to know . . . for you have provided the answer to your two immediate preceding questions.  ;)

Quote
Thanks for all this information it's all really helpful, would you think based on the difference in speed between myself and my neighbour that there is more than one multi pair cable going to the bottom of the pole that we are connected too? Also would you agree that it's likely that I am connected to one multi pair cable and my neighbour is connected to another?

The two answers to the two questions are "no" and "no".

You have confirmed that there is just one tail cable from the pole top DP. In the relevant joint box you would see that tail cable is connected to one multi-pair D-side cable. How could the joint be closed, water-tight, if, say, half the number of pairs from the DP went to one D-side cable and the other half went to a second D-side cable? The sheath of each cable is taken into the joint closure and, depending upon which type of joint closure has been deployed, there is a water-tight seal made between the cable sheaths and the joint closure. (Yes, there are a few ways that it could be done but it would not be a normal, everyday, occurrence.)

Two typical examples of joint boxes are attached, below. The first example is by the cabinet. The thicker cables are E-side cables (between the cabinet and serving exchange), the thinner cables are D-side cables (between the cabinet and various DPs). Notice the murky water in which everything resides. The second example is near the foot of a pole. That shows a typical joint closure, the obligatory murky water and some resident slugs. I can count four cables entering that joint closure . . . each one through a water-tight seal.
Title: Re: Moving to a better set of Pairs
Post by: Black Sheep on September 18, 2017, 07:40:06 AM
You have confirmed that there is just one tail cable from the pole top DP. In the relevant joint box you would see that tail cable is connected to one multi-pair D-side cable. How could the joint be closed, water-tight, if, say, half the number of pairs from the DP went to one D-side cable and the other half went to a second D-side cable? DPs). .

Just to elaborate slightly if I may ??

Although not the norm ... we do have several instances where a single feed DP will be fed via two separate D-side cables from the Cabinet.

For example, the DP could be fed via a 20pr cable but is only 'worth' 15prs .... by that I mean the planners have only provided 15 D-side pairs to that DP assuming that would be sufficient for the feeding properties.
Mr Smith at No.7 now decides he wants to run a business from his house and requires further circuits ... ergo, further pairs. But, the original D-side cable is 'full' ... ie: no capacity left from which to provide the extra pairs.

If do-able, we will put a 'strap' in from another joint in the same underground box as the EU's DP joint, that will be fed from a totally different D-side cable ... which will be able to provide the required capacity. 

Purely for info purposes, as Mr Cat is a purist in all things telecoms and I'm sure this will add to his overwhelming knowledge.  :)
Title: Re: Moving to a better set of Pairs
Post by: burakkucat on September 18, 2017, 04:31:42 PM
Just to elaborate slightly if I may ??

Please do.  :)

Quote
Although not the norm ... we do have several instances where a single feed DP will be fed via two separate D-side cables from the Cabinet.

That is exactly the sort of scenario to which I was alluding with my "(Yes, there are a few ways that it could be done but it would not be a normal, everyday, occurrence.)" It was my failure to think of the word "strap", to describe the linking cable (at gone 0100 hours this morning) which resulted the above, brief, parenthesised sentence.
Title: Re: Moving to a better set of Pairs
Post by: cwaite on September 18, 2017, 09:59:05 PM
Sorry but I am not 100 percent sure that I fully understand what's been said, So in lay mans terms am I right in thinking there is 1 multi pair cable going to a joint box at the bottom of the pole which all of us that are attached to that pole are connected to, this is connected to a joint in the JF10 underground box at the start of the estate, and is it likely that from the JF10 box back to the cab myself and my neighbour probably connected to different multipair cables going back to the cab.
Title: Re: Moving to a better set of Pairs
Post by: j0hn on September 18, 2017, 10:47:24 PM
With only 8 feeds coming from your pole it's likely you're using the same multi pair cable, though there's no way to know for sure.

You can't use your neighbour as a guide. They may be using a better modem, no internal wiring problems, etc, etc. There's always going to be lines that perform better than others. Feeding you brand new copper right to the cab might not get you what your neighbour gets.That's just 1 neighbour, other neighbours might get less.

I get 48Mb at the moment. My neighbour is getting 33Mb. Both our line estimates are high of 38Mb on a clean line. My initial guess is most of my street gets mid 30's. I've just got lucky on the crosstalk lottery, along with me optimising things in the property. Between me upgrading my modem, better/shorter patch cable, an unfiltered NTE5 faceplate, I've gained roughly 8-10Mb over the standard equipment I started with.

If you weren't banded you would get 27Mb.
Your neighbour had 34Mb.
That's a perfectly normal difference between 2 similar lines.

Your neighbour had increased by 4Mb recently. This is probably DLM using the new lower snrm targets.
If your line was stable then it might to do the same with your line.
Title: Re: Moving to a better set of Pairs
Post by: cwaite on September 20, 2017, 09:56:44 AM
I have got a Openreach Engineer coming out this morning to look at the line, I have managed to get a copy of my next door neighbours stats, I have noticed that his attenuation is higher than mine and his SNR is lower, shouldn't my speed be better than his considering my Attenuation is Lower, also I wonder why my SNR is 3x as high as my next door neighbour.

Is there anything I should point out the Openreach engineer, to help them investigate the problem.

As I say we are connected to the same pole and the same cabinet, my neighbour is on a 40/2 product from PlusNet and I am on an 80/20 product from Plusnet

Below are my stats from my HG612 Modem

           Sync (kbps)    22400          3664                           Interleaving          2             1
 Attainable rate (kbps)    26876          3753                                    INP      51.00          0.00
       Attenuation (dB)     26.2           0.0
        SNR Margin (dB)      9.8           6.8
           Power (dBmV)     10.1           6.8                            SES (total)         17             0
RSUnCorr errors (delta)        0             0                RSUnCorr errors (total)          0             0
Errored seconds (delta)        0             0                Errored seconds (total)        176          1099
       Bitswaps (delta)       45             0                       Bitswaps (total)     482424          1971
     CRC errors (delta)        0             0                     CRC errors (total)       1479          1192
     HEC errors (delta)        0             0                     HEC errors (total)          0             0
     FEC errors (delta)       14             1                     FEC errors (total)    3213704          5840
 ________________________________________________________________________________________________________________

My Next door neighbours plusnet One stats:

1. Product name:   Plusnet Hub
2. Serial number:   *********************
3. Firmware version:   Software version 4.7.5.1.83.8.237.2.2 Last updated 14/08/17
4. Board version:   Plusnet Hub One
5. DSL uptime:   0 days, 15:03:56
6. Data rate:   2001 / 39378
7. Maximum data rate:   6239 / 37847
8. Noise margin:   16.3 / 3.9
9. Line attenuation:   33.5 / 28.6
10. Signal attenuation:   33.5 / 25.6
11. Data sent/received:   6.2 GB / 94.8 GB
12. Broadband username:   ****************
13. 2.4 GHz Wireless network/SSID:   ************
14. 2.4 GHz Wireless connections:   Enabled (802.11 b/g/n (up to 144 Mb/s))
15. 2.4 GHz Wireless security:   WPA2
16. 2.4 GHz Wireless channel:   Automatic (Smart Wireless)
17. 5 GHz Wireless network/SSID:   *******************
18. 5 GHz Wireless connections:   Enabled (802.11 a/n/ac (up to 1300 Mb/s))
19. 5 GHz Wireless security:   WPA2
20. 5 GHz Wireless channel:   Automatic (Smart Wireless)
21. Firewall:   Disabled
22. MAC Address:   ****************
23. Modulation:   G.993.2 Annex B

Thanks in advance
Title: Re: Moving to a better set of Pairs
Post by: WWWombat on September 20, 2017, 11:21:28 AM
I have noticed that his attenuation is higher than mine and his SNR is lower, shouldn't my speed be better than his considering my Attenuation is Lower

All other things being equal, yes.

However, with VDSL2, all other things are not equal. In particular, the state of your line compared to the state of his line, and any differing levels of crosstalk.

Your line, for example, could have a slightly corroded joint. And/or it could be being hit by more crosstalk from other subscribers. These can be significant inequalities.

also I wonder why my SNR is 3x as high as my next door neighbour.

There are probably two main reasons why this figure differs (although you probably mean SNRM, not SNR; the M is significant)

Remember that a year ago, everyone would have a target SNRM of 6dB. You would have expected everyone to have this SNRM, unless there is a good reason.

a) Your line looks to be banded, with an artificial cap set to the downstream speed of 22.4Mbps.
This is somewhat less than the attainable speed; when actual speed is lower than attainable, it shows up as a higher SNRM than the target 6dB.
In your case, being 4.4Mbps below the attainable translates to 3.8dB SNRM above the 6dB target.

b) Your neighbour's line is currently running about 1.5Mbps above the attainable speed.
The reverse argument of (a) applies here: when actual speed is higher than attainable, it shows up as a lower SNRM than the target.
In their case, being 1.5Mbps above the attainable translates to 2.1dB SNRM below the 6dB target.

Comparing those two outcomes suggests a 3rd factor might be in play here... "XdB"

c) Up until earlier this year, BT set a 6dB SNRM target for every line. Now, however, they employ a system colloquially known as "XdB", where they adjust the 6dB target if line conditions are good. DLM monitors the line, and decides whether it could cope with (and gain from) a 5dB target instead. Or 4dB, or 3dB.

Your (capped) line will not be eligible for this system, so your target will be 6dB still.

Your neighbour's line might have been set to a lower target SNRM, and my conclusions in (b) would need to be adjusted:
c1) If it were set a target of 5dB, then it would be running 1.5Mbps above attainable speed, while being 1.1dB below the 5dB target.
c2) If it were set a target of 4dB, then it would be running 1.5Mbps above attainable speed, while being 0.1dB below the 4dB target.

On balance, I'd say that (c1) was more likely, then (b).

Is there anything I should point out the Openreach engineer, to help them investigate the problem.

You can mention the difference in speed, but there is little else that can help.

Presumably Plusnet's support staff ran some line tests that showed a fault. Is that why an engineer appointment was booked?
Title: Re: Moving to a better set of Pairs
Post by: ejs on September 20, 2017, 04:53:11 PM
Which attenuation figure are you comparing yours with- line or signal? One is higher, the other is lower.
Title: Re: Moving to a better set of Pairs
Post by: Chrysalis on September 20, 2017, 05:47:30 PM
Wombat explains it but a very simple version of the answer.

Either.

1 - Neighbour is also affected by crosstalk but modem has not yet resynced so currently is syncing higher than he/she would do on a resync noted by the fact their attainable is lower than the current sync.
2 - DLM has them on a lower snrm target which boosts sync speed at the expense of potential reliability.

Apologies if you have told us what cabinet type you on (ECI or hauwei) as I havent checked, but if you on ECI, its also possible he is on fast path whilst you are interleaved so you are losing some sync speed to FEC overheads.
Title: Re: Moving to a better set of Pairs
Post by: cwaite on September 20, 2017, 08:58:59 PM
Presumably Plusnet's support staff ran some line tests that showed a fault. Is that why an engineer appointment was booked?

My throughput fell below what plusnet said was my minimum speed (19.8mbps)

Which attenuation figure are you comparing yours with- line or signal? One is higher, the other is lower.

The HG612 on Shows Attenuation it doesnt state where its Signal or Line

Mine: From HG612
Attenuation (dB)     26.2/0.0

Neighbours from Plusnet One
9. Line attenuation:   33.5 / 28.6
10. Signal attenuation:   33.5 / 25.6

Wombat explains it but a very simple version of the answer.

Either.

1 - Neighbour is also affected by crosstalk but modem has not yet resynced so currently is syncing higher than he/she would do on a resync noted by the fact their attainable is lower than the current sync.
2 - DLM has them on a lower snrm target which boosts sync speed at the expense of potential reliability.

Apologies if you have told us what cabinet type you on (ECI or hauwei) as I havent checked, but if you on ECI, its also possible he is on fast path whilst you are interleaved so you are losing some sync speed to FEC overheads.

We had a power cut for a few seconds on Sunday, my neighbour hasnt got a UPS so it would have resynced then.
The cabinet houses a Broadcom (ChipSet Vendor Id:BDCM:0xa48c)

The enginer turned up and replaced the socket for a new 5C socket, and reset the line but said as he was a Green Speed Engineer, that was all he could do, it seems that my Sync rate has increased but my through put has fallen by another 2mbs, also G.INP has been turned off (the engineer did not know what G.INP was let alone how to restore it)

The OR Engineer started work at around 11:15am and finished around 12:45pm and just said that the line is a little slower than before and he could do no more, he said I would need to get intouch with Plusnet and ask them to send out a Broadband Boost Engineer (plusnet have told me they dont exsist anymore and they could request anything like this???)

I have post my stats from the last 24 hours as I say the Engineer started work at 11:15am and finsihed around 12:45pm today, can anyone see from these stats why its now even slower than before
https://1drv.ms/f/s!AuuoQtRhe-fgnqYD-zgHSIZgKzDyLw (https://1drv.ms/f/s!AuuoQtRhe-fgnqYD-zgHSIZgKzDyLw)

I have also attached a BT Wholesale Speedtest that I ran this evening
Title: Re: Moving to a better set of Pairs
Post by: banger on September 20, 2017, 09:17:20 PM
To me the BTw test says it all. It tells you the acceptable range and your download and upload are both not acceptable.
Title: Re: Moving to a better set of Pairs
Post by: Black Sheep on September 20, 2017, 10:18:56 PM

The enginer turned up and replaced the socket for a new 5C socket, and reset the line but said as he was a Green Speed Engineer, that was all he could do, it seems that my Sync rate has increased but my through put has fallen by another 2mbs, also G.INP has been turned off (the engineer did not know what G.INP was let alone how to restore it)

The OR Engineer started work at around 11:15am and finished around 12:45pm and just said that the line is a little slower than before and he could do no more, he said I would need to get intouch with Plusnet and ask them to send out a Broadband Boost Engineer (plusnet have told me they dont exsist anymore and they could request anything like this???)


It took the engineer an hour and a half to change a socket and perform a DLM reset ?? Stevie Wonder could have done it quicker !!!

He may not be aware that G.INP is another way of saying ReTx ....... which he should know about as ReTx is how it is stated in all official docs.

He isn't a 'Green speed engineer' ............ he means the job he picked up was classed as 'Green' ........ which means your circuit is performing at approx. the same speed as others with your attenuation, and the ILQ is good.
Our remit is to not perform any other speculative changes if the task is given to us by the ISP as 'Green'.

Broadband Boost is alive and well as far as I am concerned, I did one only last week.
Whether PN use that option (all ISP's were initially allowed to opt in to boost engineering tasks, but only BTr/BTw took the offer up), I don't know ??? You may only have the 'SFI engineering visit' option ???

The above is for info purposes only. 

 

Title: Re: Moving to a better set of Pairs
Post by: j0hn on September 20, 2017, 10:27:00 PM
To me the BTw test says nothing at all. OpenReach are only interested in the sync speed. Throughput is down to the ISP. OpenReach can't do anything at all about that.

G.INP is ALWAYS removed with a DLM reset. It can't be turned back on, by anyone. It will come back in a few days and the sync should increase further.
If you leave the line alone then in a couple weeks DLM may lower the target snrm, pushing your line up to about 31-32Mb.

As I said above, you need to stop concentrating on your neighbours line. It may never be possible to match them. Crosstalk is very very variable.

Their line without the lower snrm target is roughly 32-33Mb. Your line is about 27Mb. Perfectly normal variance from using different chipset modems and crosstalk impacts. Your neighbours Plusnet Hub One is just a rebadged BT HomeHub 5A.

My advise is wait a few days for G.INP.
Then hopefully right after that you'll see the lower snrm targets being applied.
Title: Re: Moving to a better set of Pairs
Post by: burakkucat on September 20, 2017, 11:39:43 PM
One thing that might be worthwhile flagging here . . .

Do not look at the Huawei HG612 GUI for circuit statistics. It has been coded incorrectly and muddles the data.

Use the CLI and, from the Busybox shell, issue one or more of the following --

xdslcmd info --stats
xdslcmd info --pbParams
xdslcmd info --Bits
xdslcmd info --SNR
xdslcmd info --QLN
xdslcmd info --Hlog
xdslcmd info --show
xdslcmd info --vendor
xdslcmd info --vectoring
xdslcmd --version
equipcmd swversion display
Title: Re: Moving to a better set of Pairs
Post by: cwaite on September 21, 2017, 12:08:21 AM
One thing that might be worthwhile flagging here . . .

Do not look at the Huawei HG612 GUI for circuit statistics. It has been coded incorrectly and muddles the data.

I didn't look at the GUI, I logged in via telnet, then entered busybox and used the command xdslcmd info --vendor to get the ChipSet Vendor Id:BDCM:0xa48c

It took the engineer an hour and a half to change a socket and perform a DLM reset ?? Stevie Wonder could have done it quicker !!!

He did a few tests, removed a filter that a REIN engineer fitted a few years ago and moved the socket as it was under a radiator (so awkward to get to)

Quote
He may not be aware that G.INP is another way of saying ReTx ....... which he should know about as ReTx is how it is stated in all official docs.

Yes I was shocked that I seemed to know more than him!

Quote
He isn't a 'Green speed engineer' ............ he means the job he picked up was classed as 'Green' ........ which means your circuit is performing at approx. the same speed as others with your attenuation, and the ILQ is good.
Our remit is to not perform any other speculative changes if the task is given to us by the ISP as 'Green'.

So he wasn't really going to do anything anyway, so I was lucky he reset the line and changed the socket! I am Annoyed that I lost a days wages for nothing!

Quote
Broadband Boost is alive and well as far as I am concerned, I did one only last week.
Whether PN use that option (all ISP's were initially allowed to opt in to boost engineering tasks, but only BTr/BTw took the offer up), I don't know ??? You may only have the 'SFI engineering visit' option ???

PlusNet said that they raised the broadband fault with BTwholesale, so I would think that they should be have the option of a Broadband Boost Engineer.

To me the BTw test says it all. It tells you the acceptable range and your download and upload are both not acceptable.


Exactly the Colour red in the bar and the figures kind of give the game away, its just frustrating trying to get plusnet to understand what these test results mean.
Title: Re: Moving to a better set of Pairs
Post by: Chrysalis on September 21, 2017, 08:03:46 AM
Black Sheep, broadband boost is what I had a couple of years back on plusnet when I made a very angry call to plusnet, a manager rang me back telling me he authorised it and thats the visit where my install engineer turned up to do a pair swap which fixed my speed at the time.  So plusnet at least used to use them, although may not be as standard procedure possibly needing manager approval.

My line status wasnt green tho its worth mentioning that, My line failed the GEA test due to dropping more than 25% speed in a short time interval and was also comfortably below my low clean estimate.
Title: Re: Moving to a better set of Pairs
Post by: Black Sheep on September 21, 2017, 01:03:57 PM
it's worth pointing out that the ISP dictate whether the ILQ is 'green' and the diktat is to visit the premises and test the line.

We should by now, all be aware that 'green' does not always follow that the circuit is fault free, what the 'green' marker on a job does mean is that we are not allowed to go changing pairs or spend time wandering around the network IF a fault is not picked up on the tests performed on-site.

At the OP ........... you haven't really lost a days wages for 'nothing', as the fault was driven by yourself via the ISP, the socket re-homed to an appropriate place and a service affecting REIN filter has been removed. Also, the circuit has been reset.
Add to that your MPF has had a 'Health check' via our PQT test ..... it has been worthwhile taking some time off work.

** I may as well add to the noobies looking on, we don't request you take a full day off work for our appointment slots. We have 0800-1300 or 1300-1800 available .... one or the other will be suggested.
Also, you don't have to be in attendance yourself, any adult can be the 'key holder' so long as they are prepared to wait in the house with the engineer whilst he performs his work.
Title: Re: Moving to a better set of Pairs
Post by: cwaite on September 21, 2017, 07:25:57 PM
** I may as well add to the noobies looking on, we don't request you take a full day off work for our appointment slots. We have 0800-1300 or 1300-1800 available .... one or the other will be suggested.

You can't really just take half day of work as If you booked an 8am to 1pm slot and Engineer turns up at 1pm then it may take them several hours to complete the job, not really worth me going to work at 4pm.

I don't like booking afternoon appointments as I have heard of so many EU's having an engineer turn up after 5pm and either do a rush job and end up not fixing the fault so they can ensure they can knock off at 6pm or like me have someone turn up at 5:15pm and say they can't do anything this evening and will need to come back in the morning.
Title: Re: Moving to a better set of Pairs
Post by: Black Sheep on September 21, 2017, 08:06:44 PM
Fair point ...... I have to say though, from decades of experience ...... it will be as rare as the proverbial rocking-horse do-dah having an engineer turn up at 1300 for an AM appointment.

Our 'Controls' go to the ends of the earth ringing all and sundry, (along with our managers) to get the AM slots out well before 1200. We are requested to RARA (Ring ahead - ring after) the EU to give an ETA, thus giving the EU as much opportunity as one possibly can to arrange a house-sitter, should the job run past 1300.

Title: Re: Moving to a better set of Pairs
Post by: cwaite on September 30, 2017, 11:42:48 AM
At 06:45 last Friday G.INP was turned back on and my sync on the router is showing 28999kbps, however, my profile at plusnet still seems to show 25mbs, do plusnet need to do their magic to get the profile in sync? Or is this correct, I always though that your profile was around 96% of your sync speed on VDSL?

 

I have attached some pictures of my Stats from my HG612 Modem and a recent speed test from BT Wholesale and My speed as shown on plusnets page (https://portal.plus.net/my.html?action=data_transfer_speed)


Title: Re: Moving to a better set of Pairs
Post by: j0hn on September 30, 2017, 03:24:23 PM
Drop the PPP session on your router, leave it for 5-10 mins, then reconnect. If you can't do this in your router then just turn it off for 10 mins.
No need to touch the HG612.

This usually lets the ip profile catch up. It can happen when your line resyncs quickly without dropping PPP (your ip never changed).
Title: Re: Moving to a better set of Pairs
Post by: cwaite on September 30, 2017, 04:05:47 PM
Ok Thanks I will give this a go!
Title: Re: Moving to a better set of Pairs
Post by: lee111s on September 30, 2017, 05:36:36 PM
If you’re on a retransmission high profile, the IP profile will be around 91%
Title: Re: Moving to a better set of Pairs
Post by: j0hn on September 30, 2017, 06:04:06 PM
It was 84% so definitely a stuck ip profile
Title: Re: Moving to a better set of Pairs
Post by: cwaite on October 01, 2017, 03:46:41 PM
Thanks for the help guys, I disconnected the WAN on the router and powered off for 40 mins (whilst leaving the HG612 alone) whilst this increased the profile to 28.04mbps on the BT Wholesale speed checker, plusnets profile did not move from 25mbps, in the end I had to contact them to ask them to resync my profile, which they have now done and the speeds on speed checkers seem to be around 27mbps.