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Standard User BarkingMad
(regular) Sat 13-Feb-21 11:45:11
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Upload speed decreased


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Good morning,

I’ve seen a drop in my upload speed and I’m now lower than the impacted figures provided by BT. Download is still good. I did attain much better uploads in 2017 but download was lower. I think my line was capped at 34999 in 2017.

The table show thinkbroadband results. Line had been solid and I was achieving roughly 45/5.5 (IP XXX.XXX.239.73). The line resynched before 21 December, and I noticed poor upload. After disconnecting, waiting 40 mins, and reconnecting, I attained 44/6.8 (XXX.XXX.148.243) from 21 Dec to 19 Jan. I watched the line with dslstats and could see the SR margin being changed to low numbers and then returned to the starting value.

Since 19 Jan, I’ve been achieving 42/3.5. On 03 Feb, IP changed again (occurs at 01:00) and I briefly attained 43/6.7 but later that day it looks like a rsynch occurred and I’ve been at 43/3.3 since that point. The IP did not change.

Quiet line test is quiet. All changes of IP have been instigated by DLM apart from 21 Dec.

Any ideas why my upload has decreased? I suppose a call to BT will be required?



Down HTTPx6 Avg Down HTTPx1 Avg Up Avg Latency Date IP Comment
44070 42830 3310 18 13/02/2021 10:47 xxx.xxx.67.145
43720 43450 3610 14 09/02/2021 18:09 xxx.xxx.67.145
43270 44050 3380 21 03/02/2021 18:56 xxx.xxx.67.145 Resync occurred without change of IP @ 10:17 13 Feb
43110 42800 6740 15 03/02/2021 07:29 xxx.xxx.67.145 BQM setup 03 Feb 2021
41170 41290 3600 15 31/01/2021 17:31 xxx.xxx.173.214
40850 41830 3470 27 24/01/2021 20:23 xxx.xxx.173.214
41620 42460 3730 14 20/01/2021 07:46 xxx.xxx.173.214 BQM setup 20 Jan 2021
42730 39570 3670 32 19/01/2021 19:48 xxx.xxx.195.199
44360 43720 3490 16 19/01/2021 07:46 xxx.xxx.195.199 BQM set up 19 Jan 2020
43080 44000 6840 23 21/12/2020 16:18 xxx.xxx.148.243 BQM set up 21 Dec 2020
45810 43660 5840 33 14/11/2020 19:35 xxx.xxx.239.73
45950 46680 5420 36 07/10/2020 19:45 xxx.xxx.239.73 BQM set up 05 Sep 2020
31430 31510 7065 16 02/04/2017 08:37 xxx.xxx.41.59
31470 31480 7399 12 08/03/2017 16:21 xxx.xxx.32.209 Lower download but good upload
31260 31460 7363 15 07/03/2017 19:22 xxx.xxx.32.209


Using googlemaps, walking from my house, to the cabinet – straight forward route I am approx. 600 metres from Cabinet 10. Another ISP says I'm approx 1604 metres from the exchange. It is about 1km from cabinet to the exchange.

Stats below.

Stats recorded 13 Feb 2021 10:18:56

DSLAM type / SW version: BDCM:0xa4a1 (164.161) / v0xa4a1
Modem/router firmware: AnnexA version - A2pvI042j1.d26q_rc1a
DSL mode: VDSL2 Profile 17a
Status: Showtime
Uptime: 9 days 23 hours 40 min 40 sec
Resyncs: 0 (since 13 Feb 2021 10:17:52)

Downstream Upstream
Line attenuation (dB): 22.3 0.0
Signal attenuation (dB): Not monitored
Connection speed (kbps): 49413 4365
SNR margin (dB): 2.6 8.6
Power (dBm): 11.2 2.6
Interleave depth: 4 1
INP: 52.00 0
G.INP: Enabled Not enabled
Vectoring status: 5 (VECT_UNCONFIGURED)

RSCorr/RS (%): 11.8911 0.0000
RSUnCorr/RS (%): 0.0000 0.0000
ES/hour: 0 0


Downstream Upstream
Line Coding (Trellis) On On
SNR Margin (dB) 2.5 8.6
Attenuation (dB) 22.3 0.0
Output Power (dBm) 11.2 2.6
Attainable Rate (Kbps) 49557 5033

Rate (Kbps) 49413 4365

B (# of bytes in Mux Data Frame) 227 127
M (# of Mux Data Frames in an RS codeword) 1 1
T (# of Mux Data Frames in an OH sub-frame) 0 36
R (# of redundancy bytes in the RS codeword) 10 16
S (# of data symbols over which the RS code word spans) 0.1468 0.9283
L (# of bits transmitted in each data symbol) 12974 1241
D (interleaver depth) 4 1
I (interleaver block size in bytes) 238 72
N (RS codeword size) 238 144
Delay (msec) 0 0
INP (DMT symbol) 52.00 0.00

OH Frames 0 0
OH Frame Errors 6819 86
RS Words 1956342424 3718766257
RS Correctable Errors 232134831 22
RS Uncorrectable Errors 0 0

HEC Errors 1 0
OCD Errors 0 0
LCD Errors 0 0
Total Cells 3875833494 0
Data Cells 516902492 0
Bit Errors 0 0

Total ES 1682 84
Total SES 64 0
Total UAS 598 534


VDSL Range A (Clean) 52.3 35 9.6 6.8 32.4 Available Available --
VDSL Range B (Impacted) 50.9 32.4 9.5 6.2 25.1 Available Available --

Max Observed Downstream Speed 49.41
Max Observed Upstream Speed 4.36
Observed Date 2021-02-04
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