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Since moving from Sky ADSL to Sky Fibre about a year ago, our upload speed has never exceeded 0.5 Mbit
I've finally got my hands on an unlocked HG612 so that I can see my full line stats, which has revealed something very odd with the line attenuation.
Bitloading: https://www.dropbox.com/s/f4schs05niqr0wn/bitloading...
HLog: https://www.dropbox.com/s/kyo4glroz0e4due/hlog.png?dl=0
QLN: https://www.dropbox.com/s/wr7h6sqm2aiqvrm/qln.png?dl=0
pbParams: https://www.dropbox.com/s/06zshrvf22s7fhc/pbparams.t...
Notice how it is only using U0 and D1, nothing beyond tone 860, with the other bands having extremely high attenuation.
I changing the XTE2005 i fitted back in 2011, for a MK3 has made no difference at all.
All of my internal wiring is Cat5e, no bell wire.
Any ideas/suggestions as to what could be causing this?
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High attenuation can be caused by long length or poor non-copper wire. You may have one wire of the pair disconnected - does the phone work?
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Yes, the phone works no problem at all
Line length to the Cab i would estimate to be 0.7 miles, based on Google Maps, as it follows the road out of our estate and down the main road to the cabinet. This is the only logical path based on how the estates were built in the 80s and the location of the inspection covers in the pavement.
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Have you taken the stats with the HG612 plugged into the test socket behind the faceplate?
Is there any chance any of your extensions, even though CAT5, are taken off before the incoming line reaches the NTE5? In fact, are you absolutely sure there are no extensions you are unaware of?
Bear in mind it is irrelevant whether an extension is used or not. It's mere existence matters.
Kindness isn't going to cure the world of all its awfulness but it's a good place to begin. Daisy Ridley.
My broadband basic info/help site - www.robertos.me.uk. Domains, site and mail hosting - Tsohost.
Connection - AAISP Home::1 80/20. Sync 57825/13835kbps @ 600m. - BQM
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High attenuation, 1980's estate, wonders whether it may be Aluminium cables causing the problem
Given a postcode can look and see what speed test info there is for the area and whether others have similar low uploads
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The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
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Stats are identical at the test socket.
All extensions are after the NTE5. I made sure of this back in 2011 when the XTE2005 was fitted.
Postcode is PO30 5JR
Edited by deleted (Sat 08-Oct-16 14:46:31)
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One thing I haven't considered...
The house was built in the early 80's and has an LJ2/1A master socket. As this is BT/OR property I fitted my own NTE5 as per the following guide...
http://www.kitz.co.uk/adsl/images/phone/nte5_self-fi...
Could the now 35-year-old original master socket, in combination with the NTE5, be a factor?
Edited by deleted (Sat 08-Oct-16 15:02:48)
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Yes it could. Are all the extensions filtered by the NTE Mk3 ? Are the ringwires still attached?
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I will do my best to explain the internal side...
BT incoming pair to rear of LJ2/1A - nothing plugged in the front of it.
Cat5e blue pair from rear of LJ2/1A to NTE5 input connector.
NTE5 has MK3 fitted - nothing plugged into the front of it.
Cat5e blue pair from MK3 A/B connector to upstairs RJ45 outlet - modem connected here.
Cat5e blue pair from MK3 2/5 connector to living room double-outlet extension - cordless phone and sky box
Cat5e blue pair from living room double-outlet extension to kitchen single-outlet extension - corded phone
There are no ring-wire connections at any point, and nothing else is connected prior to the NTE5 test socket.
Edited by deleted (Sat 08-Oct-16 15:16:16)
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Okay looking at distances alone - 42 Mbps is what our system makes for the speed.
Looking at the speed tests, someone on the old 40/20 product from PlusNet was getting good uploads, but very close to the cabinet, one or two others further away seemed to show a fall off in upload.
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The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
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There is one other factor to consider.
When following the instructions to install your own NTE5 after a pre-existing LJ2 (the diagram of which was provided by Clarity UK and used by Kitz, with Clarity's consent), the circuit will then have two resistive-capacitive shunts connected across the pair. One shunt being in the original LJ2 and the second shunt in the NTE5.
100% Linux and, previously, Unix.
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That was my thinking when I posted earlier.
What would be the effect of having that on the line?
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So you do actually have two masters on the circuit, which is not a good idea. Whether it can cause this problem, or even be having an overall deleterious effect, I'm not qualified to say.
At a guess, wiring from the back of the LJ2/1A has created a star-wired installation. It's front socket on one spur and the NTE5 plus its extensions on the other.
Or, now I look at your linked diagram, do you mean you used as shown the extension terminals 2 and 5 on the LJ2/1A - not the real back of it where the incoming line is connected? That wouldn't be star wiring so far as the LJ2/1A is concerned, but it may be as far as the NTE5A is concerned.
At which point my knowledge of the consequences runs out.
Kindness isn't going to cure the world of all its awfulness but it's a good place to begin. Daisy Ridley.
My broadband basic info/help site - www.robertos.me.uk. Domains, site and mail hosting - Tsohost.
Connection - AAISP Home::1 80/20. Sync 57825/13835kbps @ 600m. - BQM
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What, if anything, happens if you try disconnecting the NTE5 from the back of the LJ2/1A, then plugging the modem into the LJ2/1A's socket?
If it's star wiring issues, the shift to the LJ2/1A as only socket, with you in the front of it, should fix it.
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Unfortunatly the original master socket is behind a large cupboard, and I am struggling to find the photos I took back when the NTE5 was fitted.
If my memory is correct, the incoming line and the Cat5e are both connected to the same set of terminals on the back of the original master socket.
Basically like this image I just found via Google Images, minus the ring wire in 3.
http://i126.photobucket.com/albums/p89/bomp_bucket/m... (Note: This is NOT my socket)
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I was forgetting the LJ2/1A doesn't have separate A/B incoming line connectors, but that pic looks like one wired as an extension, with split pairs!
It's a good job it isn't yours.
How yours is wired matters. I assume you haven't used split pairs in your CAT5, anywhere.
Kindness isn't going to cure the world of all its awfulness but it's a good place to begin. Daisy Ridley.
My broadband basic info/help site - www.robertos.me.uk. Domains, site and mail hosting - Tsohost.
Connection - AAISP Home::1 80/20. Sync 57825/13835kbps @ 600m. - BQM
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What do you mean by split pairs?
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Slightly higher attenuation, possibly in the voice band frequencies, would be my best guess.
The R/C shunt consists of a 1.8 micro Farad capacitor and a 470 kilo Ohm resistor connected in series. The simplest solution would be to remove one of the shunts . . . the one within the NTE5 that you installed.
The purpose of the that R/C shunt is to provide an out-of-service termination for the circuit when no equipment is connected across the pair. Such shunts came into being when the current style, parallel connection, plug and socket arrangement was adopted in the early 1980s.
100% Linux and, previously, Unix.
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In cat5 wires are twisted together e.g. blue with a thin white stripe, and white with a thin blue strip, those form a pair.
A split pair is when you wire the orange with thin white to one terminal, and the blue with thin white to another, ie. use a single wire from two pairs.
The split means that the noise rejection that the twists in the cable produce are lost, so cable does not perform as well.
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The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
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Ah got it. No split pairs on my wiring, everything is using the blue and blue/white wires (pair 1).
As an IT Professional I understand the importance of twisted pairs.
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(Edit - typed while MrSaffron and you exchanged posts about it).
The blue and blue/white wires are a pair twisted together. That helps cancel our randon noise attacking them as they both get the attack which self-cancels. A bit like (audible) noise-cancelling headphones.
The blue should go to 2, the blue/white to 5. Similarly with the orange and orange/white.
That picture shows that two pairs have been split.
When wired correctly noise is picked up by (say blue) T2 at one end to T2 at the other, and the same noise is picked up by the blue/white wire from T5-T5. Because they are wound round each other, it largely cancels out.
In the picture T2 will pick up noise on the blue and T5 noise on the orange, but they aren't wound round each other so don't cancel out. Similarly with the blue/white and orange/white. Both pairs as wired there will get additive noise instead of largely cancelling noise.
To us it seems a bit minor as they are in the same outer casing so getting similar noise exposure, but in practice the exposure is different enough to mess up the connection.
Kindness isn't going to cure the world of all its awfulness but it's a good place to begin. Daisy Ridley.
My broadband basic info/help site - www.robertos.me.uk. Domains, site and mail hosting - Tsohost.
Connection - AAISP Home::1 80/20. Sync 57825/13835kbps @ 600m. - BQM
Edited by RobertoS (Sat 08-Oct-16 16:55:12)
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As posted previously, this is not the case with my wiring. I am using the blue and blue/white wires from the same pair (Pair 1).
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Yes, I saw that. Hence my edit at the top of my post  . I thought it worth leaving the post there rather than deleting it though.
Kindness isn't going to cure the world of all its awfulness but it's a good place to begin. Daisy Ridley.
My broadband basic info/help site - www.robertos.me.uk. Domains, site and mail hosting - Tsohost.
Connection - AAISP Home::1 80/20. Sync 57825/13835kbps @ 600m. - BQM
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Is your CAT5 wiring solid copper, or is it stranded or copper-coated-magnesium, etc?
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Proper solid copper. The same stuff used for commercial structured cabling.
I do not beleive the Cat5e is at fault as I get exactly the same results are the NTE5 test socket with everything else disconnected.
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Be wary when estimating line length.
On a logical basis, my line would be about 50 Metres long, plenty of ducting available on a green-field site in 1967 - but is in fact at least 250 Metres, as it does not follow the "obvious" route, going about 125 Metres away from my house, before returning by about another 125 Metres.
Basically all is underground, compounded by the main ducting with the E-side from the Exchange, goes past my house about 2 metres away, to reach the PCP, 50 metres away.
The excess length came to light in the 1980s, when assisting a PO/BT engineer clear a fault on it.
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