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Author Topic: Throughput issue - possibly?  (Read 1287 times)

BT ate my Broadband

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Throughput issue - possibly?
« on: March 07, 2011, 07:01:54 PM »

Hi, all.

Having taken the time to try and help myself in regards to reading this website for guidance in fixing any faults, it has reached the time to ask for advice.

On Friday 4th March, BT did a supposed 'Lift and Shift' from ADSLMax to 21CN on my line.
On Saturday, BT Network Faults contact me to ask how the speed issue is going.
Explain to them that it's still poor.
Told to wait for the line to stabilise.
I asked for GTA to show test results and ADSL Stats. (As follows,...)
Using btcentralplus to conduct test.

Download Speed
4075 Kbps
Max Achievable Speed
4000 Kbps

Download speed achieved during the test was - 4075 Kbps
For your connection, the acceptable range of speeds is 1200-4000 Kbps.
Additional Information:
Your DSL Connection Rate :6848 Kbps(DOWN-STREAM), 416 Kbps(UP-STREAM)
IP Profile for your line is - 4500 Kbps
The throughput of Best Efforts (BE) classes achieved during the test is - 4.39:16.23:79.39 (SBE:NBE:PBE)
These figures represent the ratio while sententiously passing Sub BE, Normal BE and Priority BE marked traffic.

The results of this test will vary depending on the way your ISP has decided to use these traffic classes.

Upload Speed
324 Kbps
Max Achievable Speed
416 Kbps

Connection time.......................0 days, 18:36:02
Downstream.............................6,848 Kbps
Upstream.....................................416 Kbps
VPI/VCI.....................................0/38
Type.........................................PPPoA
Modulation...............................ITU-T G.992.1
Latency type............................Interleaved
Noise margin (Down/Up)..........6.3 dB / 26.0 dB
Line attenuation (Down/Up)....40.0 dB / 20.5 dB
Output power (Down/Up)........19.8 dBm / 12.6 dBm
Loss of Framing (Local)   8
Loss of Signal (Local)   1
Loss of Power (Local)   0
FEC Errors (Down/Up)   49128 / 4
CRC Errors (Down/Up)   283 / 2147480000
HEC Errors (Down/Up)   nil / 4
Error Seconds (Local)   2338

Would the above results suggest slow throughput. (I accept that I have to allow for line stabilisation)

That said,...
I'm then informed by the Network Faults advisor that the lift and shift will be carried out later in the day. ??

Today, Monday, I'm contacted by Network Faults who again ask how the speed is - having allowed the line to settle since Friday. ????

Anyway,...
The result that was returned following a speedtest that took place whilst chatting with the advisor returned the results, thus;

Download Speed
5365 Kbps
Max Achievable Speed
7150 Kbps

Download speed achieved during the test was - 53655 Kbps
For your connection, the acceptable range of speeds is 2000-7150 Kbps.
Additional Information:
Your DSL Connection Rate :7054 Kbps(DOWN-STREAM), 440 Kbps(UP-STREAM)
IP Profile for your line is - 6000 Kbps
The throughput of Best Efforts (BE) classes achieved during the test is - 4.58:15.73:79.7 (SBE:NBE:PBE)
These figures represent the ratio while sententiously passing Sub BE, Normal BE and Priority BE marked traffic.

The results of this test will vary depending on the way your ISP has decided to use these traffic classes.

Upload Speed
269 Kbps
Max Achievable Speed
440 Kbps

As of 1805 this evening, the ADSL Settings returned this;


Connection time 1 day, 3:40:20
Downstream 7,054 Kbps
Upstream 440 Kbps
VPI/VCI 0/38
Type PPPoA
Modulation ITU-T G.992.5
Latency type Interleaved
Noise margin (Down/Up) 3.9 dB / 24.9 dB
Line attenuation (Down/Up) 42.5 dB / 20.8 dB
Output power (Down/Up) 0.0 dBm / 13.2 dBm
Loss of Framing (Local) 19
Loss of Signal (Local) 2
Loss of Power (Local) 0
FEC Errors (Down/Up) 1838456 / 4294967232
CRC Errors (Down/Up) 190 / 2147480000
HEC Errors (Down/Up) nil / 0
Error Seconds (Local) 2454

Having attempted to help myself before seeking advice, is it safe to assume that at present there appears to still be a throughput issue? (accepting the fact I have to wait for line settling)

I ask the question because of,
a).. the FEC/CRC errors,
b).. the modulation. (I was already supposed to be on ADSL Max, but the modulation suggested this wasn't the case, and also that the supposed Lift and Shift wasn't carried out on Friday.
c).. I'm unsure of what else could be a cause of really slow broadband speed, since I've had multiple Openreach engineers attend the house - changed home hub, Cab checked, Exchanged checked, etc, etc.

Sorry if this topic/question has been asked before.

Any help, preferably in lay-mans terms, would be gratefully received.

Many thanks.
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