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New line slower than old line

pdc95
Dabbler
Posts: 23
Registered: ‎06-07-2012

New line slower than old line

I had a problem last November which resulted in a call by a BT engineer.
He replaced my 35 year old line with a new line drilled straight the wall into a master socket.
This line went to another pole 100 yards nearer the cabinet, and he picked up a new pair to the cabinet.
Before the problem I was getting 12.5 Meg down and 1.1 Meg up.
Now I get 8.5 Meg down and 0.5 Meg up
Why ?
14 REPLIES 14
Community Veteran
Posts: 38,460
Thanks: 1,032
Fixes: 62
Registered: ‎15-06-2007

Re: New line slower than old line

Please post the full router stats and we may have an idea
pdc95
Dabbler
Posts: 23
Registered: ‎06-07-2012

Re: New line slower than old line

Here are the modem/router stats
Bullion 7700N
Mode: ADSL_2plus
Traffic Type: ATM
Status: Up
Link Power State: L0

Downstream Upstream
Line Coding(Trellis): On On
SNR Margin (0.1 dB): 124 290
Attenuation (0.1 dB): 310 168
Output Power (0.1 dBm): 0 124
Attainable Rate (Kbps): 10184 888
Path 0 Path 1
Downstream Upstream Downstream Upstream
Rate (Kbps): 9266 440 0 0

MSGc (# of bytes in overhead channel message): 59 12 0 0
B (# of bytes in Mux Data Frame): 144 55 0 0
M (# of Mux Data Frames in FEC Data Frame): 1 1 0 0
T (Mux Data Frames over sync bytes): 2 1 0 0
R (# of check bytes in FEC Data Frame): 10 8 0 0
S (ratio of FEC over PMD Data Frame length): 0.4989 4.0 0.0 0.0
L (# of bits in PMD Data Frame): 2485 128 0 0
D (interleaver depth): 64 8 0 0
Delay (msec): 7.98 8.0 0.0 0.0
INP (DMT symbol): 1.3 2.0 0.0 0.0

Super Frames: 225950124 200493412 0 0
Super Frame Errors: 20693 2 0 0
RS Words: 60847734 3296110 0 0
RS Correctable Errors: 1124 0 0 0
RS Uncorrectable Errors: 0 0 0 0

HEC Errors: 142291 0 0 0
OCD Errors: 0 0 0 0
LCD Errors: 0 0 0 0
Total Cells: 165896821 7860032 0 0
Data Cells: 25224 19071 0 0
Bit Errors: 0 0 0 0

Total ES: 3783 1
Total SES: 285 0
Total UAS: 344 344
Community Veteran
Posts: 3,789
Registered: ‎08-06-2007

Re: New line slower than old line

Quote from: pdc95
Downstream Upstream
Line Coding(Trellis): On On
SNR Margin (0.1 dB): 124 290
Attenuation (0.1 dB): 310 168
Output Power (0.1 dBm): 0 124
Attainable Rate (Kbps): 10184 888

That indicates that your default SNR margin has been increased to ~12dB, possibly due to the fault in November.
If you line is currently stable, you can request a retrain of your line, which will reduce the SNR margin back down to 6dB, giving you an increase in sync speed.
Maximum theoretical speed for your line with the reported attenuation of 31dB is 14528 Kbps.
The Digital Care chaps should pick this up and should be able to confirm whether your line is stable, and a good candidate for retraining.
B.
Community Veteran
Posts: 38,460
Thanks: 1,032
Fixes: 62
Registered: ‎15-06-2007

Re: New line slower than old line

Your default noise margin looks to be about 15dB (it could be 12dB but as the noise margin drops at this time of day I suspect 15dB)
Either way you need a retrain providing the reason for the high noise margin has been fixed.
How long has the router been in sync
Once this has been sorted you could ask for the upstream to be uncapped which will five a useful speed increase
EDIT - I wish Barry didn't type so fast
pdc95
Dabbler
Posts: 23
Registered: ‎06-07-2012

Re: New line slower than old line

The router has been insync since mid November when the line was replaced.
How do I get a retrain and upload uncapped ?
Community Veteran
Posts: 38,460
Thanks: 1,032
Fixes: 62
Registered: ‎15-06-2007

Re: New line slower than old line

Hopefully it will be picked up here
pdc95
Dabbler
Posts: 23
Registered: ‎06-07-2012

Re: New line slower than old line

Let's hope so
Many thanks for help
pdc95
Dabbler
Posts: 23
Registered: ‎06-07-2012

Re: New line slower than old line

Even slower now
7.070 down
.35 up
Nothing being done ?
Plusnet Alumni (retired) orbrey
Plusnet Alumni (retired)
Posts: 10,540
Registered: ‎18-07-2007

Re: New line slower than old line

Hi there,
You've been connected now well over 48 hours so I've requested the reset for you. Interleaving will stay on but I set the target SNR for downstream to 6dB which should improve the speeds for you. Your profile on our side has also been adjusted so it doesn't slow things down when they do improve, that should happen within the next couple of hours or so.
Sorry for the delay in picking this up.
pdc95
Dabbler
Posts: 23
Registered: ‎06-07-2012

Re: New line slower than old line

Not much change
8.37 down
0.37 up
What is going on ?
Plusnet Help Team
Plusnet Help Team
Posts: 14,182
Thanks: 313
Fixes: 89
Registered: ‎27-04-2007

Re: New line slower than old line

<img src="http://ccgi.psmith12.plus.com/visradius/generated/image135851829513.png"/>
Looks like there may have been a few connection drops over the past few days which won't be helping, let us know if that might have been yourself powercycling or rebooting the router perhaps.
To be honest though and bearing in mind what you mentioned about the previous line the speeds you are reporting now are very close to the speed estimate given for that line and no 2 lines are guaranteed to be the same I'm afraid.
If this post resolved your issue please click the 'This fixed my problem' button
 Adam Walker
 Plusnet Help Team
pdc95
Dabbler
Posts: 23
Registered: ‎06-07-2012

Re: New line slower than old line

I rebooted the modem this am otherwise not touched it.
Upload is very low speed as I need to maintain a web site.
0.33 down from 0.96 is quite a drop (60%).
Down load down by 25%.
Not very happy with this .
Plusnet Alumni (retired) chrispurvey
Plusnet Alumni (retired)
Posts: 5,369
Fixes: 1
Registered: ‎13-07-2012

Re: New line slower than old line

Hi there,
Your upload was set to 448k, so I've uncapped this an it will complete tomorrow for you which will see your upload speeds. Let me know how you get on when this is complete with your download and upload speeds.
pdc95
Dabbler
Posts: 23
Registered: ‎06-07-2012

Re: New line slower than old line

Now 7.8 D/L & 0.9 U/L
Many thanks.