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Standard User deleted
(deleted) Thu 01-Sep-16 07:47:56
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Re: Line attenuation help?


[re: deleted] [link to this post]
 
Your upstream attenuation is the problem. Are you connected to the master socket, or are you using a telephone extension? Do you have other devices or connecting wires to the master socket?
Standard User deleted
(deleted) Thu 01-Sep-16 08:56:19
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Re: Line attenuation help?


[re: deleted] [link to this post]
 
Vdsl/wifi router is connected to the Openreach master socket. Nothing else connected to any other sockets in the house. I have a NAS drive and the tv coming out of the Ethernet ports on the router, but that's it.
Standard User RobertoS
(elder) Thu 01-Sep-16 10:03:18
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Re: Line attenuation help?


[re: deleted] [link to this post]
 
Ummm. Need to think, but it would be a good idea to blank out the IP Address in the first section of your post. Google indexes these forums so it goes public.

Does the router connect to the socket with the DSL cable plus a filter, or do you use a plugin extension cable as well between the DSL cable and filter?

Do you have a phone plugged in anywhere? I know you've said nothing at any other sockets, but I've seen people not count the phone.

It would be a good idea to try connecting through the test socket inside the master. Also if you do have a landline phone available, make sure it doesn't work in any/all extension sockets while the master faceplate is off.

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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Standard User fourtytwo
(learned) Thu 01-Sep-16 10:10:18
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Re: Line attenuation help?


[re: deleted] [link to this post]
 
In reply to a post by Woodlee:
TP-Link archer vr600 ac1600
This is brand new as I wanted to try an alternative to the technicolor router from SSE.

It is possible the modem is misconfigured, you say an alternative to the technicolor so did SSE provide you with a modem for this service and if so have you tried using it ?
FYI on VDSL2 the uplink and downlink are interleaved across all frequencies and the start ABOVE the ADSL2/+ downlink, see here

W8960n on Lonnggggg line
Standard User RobertoS
(elder) Thu 01-Sep-16 11:09:27
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Re: Line attenuation help?


[re: fourtytwo] [link to this post]
 
"Interleaved" isn't a good word to use there, as it makes people think of packet interleaving.

I'm using an iPad at the moment so no CLI, but in the Windows CLI, running telnet to the modem, then the command on an unlocked Openreach HG612 to show what you mean is:-

xdslcmd info --pbParams

That shows how the down and up bin bands are interspersed.

Some modems will have a different command from xdslcmd, but it's the same as to get the normal stats, as in "something" info --stats and "something" info --show.

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
Standard User deleted
(deleted) Thu 01-Sep-16 11:23:50
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Re: Line attenuation help?


[re: deleted] [link to this post]
 
Agreed that the Upstream Attenuation seems very high.

My EE BB 2 does not give a figure for that; but earlier this week I noted a relative's figures on an HH 5 -

23.6 db Upstream Attenuation.

16.0 db Down Att - which seems reasonable at 350 Metres compared to 13.6 db for my 300 Metre line.

(The relative is having problems. Without re-setting, his Download speed jumped from around 22 Mbps Down to 45 Mbps Down, whilst the corded phone worked fine on the QLT, under both conditions.)

---------

I was also wondering about the OP's SNR Margins of-

7.5 db Up, 5.4 db Down.

These seem tight compared to my relative's 6.3 U and 14.1 D (but wondering about the 6.3 Up)

My SNR Margins are-

22.2 Up and 18.1 Down
Standard User deleted
(deleted) Thu 01-Sep-16 20:14:40
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Re: Line attenuation help?


[re: deleted] [link to this post]
 
Are the other sockets in the house still operational and are they connected to the master socket faceplate?
Standard User MHC
(sensei) Fri 02-Sep-16 09:11:56
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Re: Line attenuation help?


[re: deleted] [link to this post]
 
I not sure if there is actually anything signifacantly wrong and that it is just down to the line characteristics.

I have had a look at the estimates for a line I know and they are:

Clean: Down -17.8/11.8 Up - 1.2/0.8
Impacted: Down - 15.9/5.7 Up - 1.2/0.6

So, in the same downstream range as yourself and whilst the upstream is estimated to be greater than yours it is only just above your original ADSL speeds. What did your pre-install estimates suggest?

Can you use DSL Stats and get a screen shot of the Bit Loading with SNR overlay?


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

M H C


taurus excreta cerebrum vincit
Administrator MrSaffron
(staff) Fri 02-Sep-16 16:26:50
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Re: Line attenuation help?


[re: MHC] [link to this post]
 
The attenuation relations between upload and download and very different on VDSL to ADSL2+

Am away so going on memory, first band is download on VDSL2, followed by upload in a higher band, i.e. D0,U0, D1, U1 D2, U2

I suspect line length means DO is roughy okay hence the download giving something, but very little use made of U0 due to the line length and very few usable bits available there, then D1 and further up spectrum totally unavailable.

The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
Standard User RobertoS
(elder) Fri 02-Sep-16 17:34:15
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Re: Line attenuation help?


[re: RobertoS] [link to this post]
 
For those who haven't seen what is being described about the frequency/bin layout:-

# xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Last initialization procedure status:   0
Max:    Upstream rate = 13850 Kbps, Downstream rate = 56880 Kbps
Bearer: 0, Upstream rate = 13835 Kbps, Downstream rate = 57825 Kbps
Bearer: 1, Upstream rate = 0 Kbps, Downstream rate = 0 Kbps

Discovery Phase (Initial) Band Plan
US: (7,32) (871,1205) (1972,2782)
DS: (33,859) (1216,1961) (2793,3970)

Medley Phase (Final) Band Plan
US: (7,32) (871,1205) (1972,2774)
DS: (33,859) (1216,1961) (2793,3970)

VDSL Port Details               Upstream                Downstream
Attainable Net Data Rate:       13850 kbps              56880 kbps
Actual Aggregate Tx Power:         7.4 dBm               13.5 dBm
===============================================================================
VDSL Band Status        U0    U1     U2     U3   U4     D1   D2     D3
Line Attenuation(dB):   5.3   30.3  46.2   N/A   N/A  14.7  37.9  59.2
Signal Attenuation(dB): 5.3   29.3  45.0   N/A   N/A  19.5  37.5  59.3
SNR Margin(dB):         6.7    6.2   6.2   N/A   N/A   6.1   6.1   6.1
TX Power(dBm):          0.8  -12.1   6.3   N/A   N/A  11.0   7.9   5.6
#
The interspersing is seen in the "Band Plan" sections.

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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