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Standard User ansam
(regular) Sat 31-Jan-15 17:07:56
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Drop in Speed


[link to this post]
 
Hello,

So I happen to run a speed test the other day on the BT wholesale website, I was initially getting about 72mbps but the new speed test shows I was getting around 40mbps. I contacted BT and they have said there is nothing wrong their end. I am a loss as to what the issue is.

I have an ASUS router connected to an OpenReach modem.

Thinks I have tried:

- Reset modem
- Reset router back to factory settings
- Connected computer directly to the router (its currently connection to switch).
- Connected computer directly to OpenReach modem (setup a PPOE connection).
- Disconnecting everything except my computer on the network.

Here are some stats from the OpenReach modem.

==
# xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Max: Upstream rate = 37093 Kbps, Downstream rate = 98092 Kbps
Path: 0, Upstream rate = 19999 Kbps, Downstream rate = 79999 Kbps

Discovery Phase (Initial) Band Plan
US: (0,95) (868,1207) (1972,2783)
DS: (32,859) (1216,1963) (2792,3971)
Medley Phase (Final) Band Plan
US: (0,95) (868,1207) (1972,2783)
DS: (32,859) (1216,1963) (2792,3971)
VDSL Port Details Upstream Downstream
Attainable Net Data Rate: 37093 kbps 98092 kbps
Actual Aggregate Tx Power: - 0.3 dBm 12.4 dBm
============================================================================
VDSL Band Status U0 U1 U2 U3 D1 D2 D3
Line Attenuation(dB): 2.7 13.5 19.8 N/A 7.5 16.2 24.3

Signal Attenuation(dB): 2.7 12.6 18.7 N/A 7.5 16.2 24.3

SNR Margin(dB): 23.7 23.0 23.2 N/A 6.6 6.6 6.6

TX Power(dBm): -14.8 -30.2 -0.5 N/A 8.1 7.8 7.1

# xdslcmd info --show
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Max: Upstream rate = 37069 Kbps, Downstream rate = 98092 Kbps
Path: 0, Upstream rate = 19999 Kbps, Downstream rate = 79999 Kbps

Link Power State: L0
Mode: VDSL2 Annex B
VDSL2 Profile: Profile 17a
TPS-TC: PTM Mode
Trellis: U:ON /D:ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 6.6 23.2
Attn(dB): 0.0 0.0
Pwr(dBm): 12.4 -0.3
VDSL2 framing
Path 0
B: 57 237
M: 1 1
T: 64 42
R: 16 16
S: 0.0231 0.3781
L: 25665 5374
D: 1339 1
I: 74 127
N: 74 254
Counters
Path 0
OHF: 1297322 363129
OHFErr: 0 0
RS: 249085501 2359794
RSCorr: 8183 0
RSUnCorr: 0 0

Path 0
HEC: 0 0
OCD: 0 0
LCD: 0 0
Total Cells: 221750189 0
Data Cells: 6251240 0
Drop Cells: 0
Bit Errors: 0 0

ES: 0 0
SES: 0 0
UAS: 19 19
AS: 1442

Path 0
INP: 3.00 0.00
PER: 1.10 3.97
delay: 8.00 0.00
OR: 151.73 64.47

Bitswap: 183 0
==
Standard User MHC
(sensei) Sat 31-Jan-15 17:12:56
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Re: Drop in Speed


[re: ansam] [link to this post]
 
Open TaskManager (assuming you are using Windows) and select Networking tab.

Run a speedtest here and at speedtest.net one after the other. Grab a screenshot of Task Manager and host that on Flikr, photobucket, tinypic or similar.


Provide links to the test results and image ...


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

M H C


taurus excreta cerebrum vincit
Standard User ansam
(regular) Sat 31-Jan-15 17:30:19
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Re: Drop in Speed


[re: MHC] [link to this post]
 
Hello,

Here you go:

http://i59.tinypic.com/2ekqgsk.png
http://i58.tinypic.com/oid655.png
http://i59.tinypic.com/j7dfso.png

Thanks
Sam


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Standard User MHC
(sensei) Sat 31-Jan-15 17:46:51
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Re: Drop in Speed


[re: ansam] [link to this post]
 
Can you widen the screen to get both on one and also ensure it is scaled so the full extent can be seen

And links to the actual test results?


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

M H C


taurus excreta cerebrum vincit
Standard User ansam
(regular) Sat 31-Jan-15 18:24:54
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Re: Drop in Speed


[re: MHC] [link to this post]
 
Hello,

I thought it best to do a video instead so here it is:

https://www.screenr.com/fvtN

Results:
http://www.thinkbroadband.com/speedtest/results.html...
http://www.speedtest.net/my-result/4105434082

Thanks
Sam
Standard User ansam
(regular) Sun 01-Feb-15 11:51:01
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Re: Drop in Speed


[re: ansam] [link to this post]
 
Hello,

Its really strange because from what I read the stats from the modem look good unless I am missing something.

-Sam
Standard User rippedcotton
(experienced) Sun 01-Feb-15 17:56:33
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Re: Drop in Speed


[re: ansam] [link to this post]
 
In reply to a post by ansam:
Hello,

Its really strange because from what I read the stats from the modem look good unless I am missing something.


So it isn't a sync speed (and thus a noise/SNR) issue, it seems to be throughput that is problematic which points at something further into the network, backhaul or possibly ISP gateways.

--

Brian

Zen Pro

Edited by rippedcotton (Sun 01-Feb-15 21:28:25)

Standard User phil_w73
(learned) Sun 01-Feb-15 18:02:02
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Re: Drop in Speed


[re: ansam] [link to this post]
 
Yep the stats look ok - have you always connected to the router the same way, i.e. it looks like a USB3 gigabit ethernet adapter?
Standard User ansam
(regular) Sun 01-Feb-15 18:18:33
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Re: Drop in Speed


[re: rippedcotton] [link to this post]
 
Hello,

No its a new laptop. I have a hardwired desktop though and seeing the same sort of stats.

-Sam
Standard User rippedcotton
(experienced) Sun 01-Feb-15 21:31:42
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Re: Drop in Speed


[re: ansam] [link to this post]
 
In reply to a post by ansam:
Hello,

No its a new laptop. I have a hardwired desktop though and seeing the same sort of stats.


I wasn't saying that the problem is in your devices or network.

My opinion is that there is a limitation somewhere in the connection back from your exchange to your ISP. It could be down to backhaul congestion or even some sort of mis-configuration in equipment out of your control.

You need to do some speed tests that use the BT speed tester and also 3rd party ones and see if there is a difference in the throughput, that could help to identify where the problem lies.

--

Brian

Zen Pro
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