Why does my line attenuation change all the time?

Question

Why would my line attenuation have gone from 65dB to 72.3dB?  I think there is a bad connection on my line, but BT's test equipment says my line is fine.
1st ADSL Line Status
Connection Information
Line state:
Connected
Connection time:
0 days, 00:52:21
Downstream:
1.372 Mbps
Upstream:
659.6 Kbps
ADSL Settings
VPI/VCI:
0/38
Type:
PPPoA
Modulation:
G.992.5 Annex A
Latency type:
Interleaved
Noise margin (Down/Up):
6.2 dB / 5.8 dB
Line attenuation (Down/Up):
65.0 dB / 43.9 dB
Output power (Down/Up):
15.0 dBm / 12.4 dBm
FEC Events (Down/Up):
113157 / 9145
CRC Events (Down/Up):
421 / 240
Loss of Framing (Local/Remote):
0 / 0
Loss of Signal (Local/Remote):
0 / 0
Loss of Power (Local/Remote):
0 / 0
HEC Events (Down/Up):
1850 / 810
Error Seconds (Local/Remote):
169 / 215
 2nd ADSL Line Status
Line state
Connected
Connection time
2 days, 12:34:52
Downstream
928 Kbps
Upstream
446 Kbps
ADSL Settings
VPI/VCI
0/38
Type
PPPoA
Modulation
G.992.5 Annex A
Latency type
Interleaved
Noise margin (Down/Up)
6.2 dB / 11.9 dB
Line attenuation (Down/Up)
72.3 dB / 44.0 dB
Output power (Down/Up)
1.4 dBm / 0.8 dBm
Loss of Framing (Local/Remote)
0 / 0
Loss of Signal (Local/Remote)
0 / 0
Loss of Power (Local/Remote)
0 / 0
FEC Errors (Down/Up)
5666 / 0
CRC Errors (Down/Up)
442 / 0
HEC Errors (Down/Up)
2257 / 0
Error Seconds (Local/Remote)
87 / 0

Answer 1

I got a reply from the chairmans office
I’ve spoken with BT
Wholesale again today and I’m waiting on a report coming in from the Chief
Engineers Office.
What I’ve
been doing
I’ve also gone
through all the history available of the work that has been done on your line
and can confirm the following:
Your line is
all copper and is on the best E and D side cables available.
We have changed
the network equipment in the exchange on multiple occasions.
And it doesn’t
look like there is any more physical work can be carried out.
The report I’m
waiting for from BT Wholesale is about a known issue that we have had with
certain exchange equipment which is used to make the phone ring when it is
being called and causing the broadband connections to drop, I need this to
confirm if your line is affected by this specific issue.
I think you
have spoke with Donal earlier today and discussed the option of moving onto an
8meg service instead of the upto 20meg, and you told him this has been tried
before and did not work, can you remember roughly when this was so I can check
it with BT Wholesale?
What happens
next
There is still
an engineer on his way out to you tomorrow between 1pm and 6pm. I’m not sure
what this engineer will be able to do given that we have had it confirmed that
you are already on the best lines available but we will see how he gets on and
take it from there. (Might get a nice surprise!)
I’ll give you a
call tomorrow to confirm the update from the chief engineers office and also
see if the engineer has been out on site with you.
Best Wishes
Chris
My reply
Hi,
Thanks for the reply, some of the information in your email isn’t correct.
The D-side is only the “best lines available” because it’s the only one available!
I had the BB disconnecting when the phone rang, long before going on the new equipment.
They have exchanged the network equipment on “multiple occasions”, even though I told them not to bother because I knew it would make no difference.
The facts are:
NO WORK has been done on my D-side (apart from the connections directly outside my property)
Many people that have had the same fault have told me it turned out to be the D-side
 I was told by a BT Openreach engineer that they would not do any work on my D-side because part of it was aluminium.  But this now turns out not to be true, so I have no idea why they will not do any work on my D-side.
At the cab, the broadband is the correct speed and works fine.
My caller display, often doesn't work. I think this is the same line fault that causes this.
A leakage to earth was detected on my line, but was never fixed.
My phone often rings 2 or 3 times, when I finish a call. I think this is the same line fault that causes this.
When the BB speed goes up, the router records a huge amount of errors.
 A few years ago my BB failed altogether, it turned out to be the connection outside my property.  The connection was green and in bad condition. There are loads more of these connections between my house and the cab, they will be just as old or older.
A BT engineers test equipment detected a change in resistance somewhere on my D-side, I haven’t heard if that was ever looked into.
Every piece of evidence points at a bad connection on my D-side, so you can see why I will not rest until I know that all the connections have been replaced.  BT wholesales answer of “that there is nothing wrong with your line” just isn’t good enough because the fault still exists.