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sw30
Beginner
335 Views
Message 1 of 11

Infinity speed issues

I have BT Inifinity with Home Hub 5 and am having speed issues. The gauranteed minimum access speed for my line is around 24mb.

 

Checking the download IP profile I have (today) 22.44mb, up from 18.5mb yesterday. Today an Openreach engineer came round and did a speed test from my master socket and got around 18mb (which is fairly consistent with my tests). Interestingly he went outside and connected to their wires before they came into the house and he got 27mb. The engineer said this was down to internal wiring

 

This is confusing me as my understanding is that the IP profile is the maximum achievable speed so it being 22.44mb there is no chance I could get the same speed as the engineer got outside the house, regardless of the state of the internal wiring.

 

Any ideas?

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Distinguished Sage
Distinguished Sage
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Message 2 of 11

Re: Infinity speed issues

can you go to hub manager then troubleshooting then helpdesk and post stats 1-12

 

can you run btspeedtester and when first test completes run diagnostic test and post results 

 

 

btspeedtester

 

can you enter phone number and post results  https://www.btwholesale.com/includes/adsl/main.html



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sw30
Beginner
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Message 3 of 11

Re: Infinity speed issues

Here you go...

 

1. Product name:BT Home Hub
2. Serial number:+068343+NQ41327945
3. Firmware version:Software version 4.7.5.1.83.8.173.1.6 (Type A) Last updated 05/06/14
4. Board version:BT Hub 5A
5. VDSL uptime:0 days, 01:36:32
6. Data rate:5865 / 21770
7. Maximum data rate:7080 / 28317
8. Noise margin:5.6 / 7.7
9. Line attenuation:0.0 / 30.3
10. Signal attenuation:0.0 / 27.0
11. Data sent/received:207.8 MB / 1.5 GB
12. Broadband username:

bthomehub@btbroadband.com

 

Featured ProductsDownstream Line Rate(Mbps)Upstream Line Rate(Mbps)Downstream Range(Mbps)Availability Date  High Low High Low    

FTTC Range A (Clean)47.834.810.67--Available
FTTC Range B (Impacted)4022.410.65.7--Available
 
WBC ADSL 2+Up to 7--4.5 to 11.5Available
WBC ADSL 2+ Annex MUp to 7Up to 14.5 to 11.5Available
ADSL MaxUp to 5.5--4 to 8Available
WBC Fixed Rate2----Available
Fixed Rate2----Available
Other Offerings
Fibre Multicast------Available
Copper Multicast------Available

 

Download speedachieved during the test was - 20.43 Mbps
 For your connection, the acceptable range of speedsis 15.7 Mbps-22.44 Mbps .
 Additional Information:
 IP Profile for your line is - 22.44 Mbps

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Distinguished Guru
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Message 4 of 11

Re: Infinity speed issues

Not quite. IP Profile is calculated from the sync speed. The sync speed depends on the noise margin and the target noise margin is 6.

As your noise margin is 7.7, this indicates you have noise on the line causing instability and reduced sync.
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sw30
Beginner
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Message 5 of 11

Re: Infinity speed issues

Just so I understand, there is more noise than there should be on the line which lowers the sync speed, which in turn reduces the IP profile?

 

So the Openreach engineer would have seen reduced noise outside the property, which in turn mean he would have had a high sync speed, hence the 27.4mb outside?

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Distinguished Guru
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Message 6 of 11

Re: Infinity speed issues

When your modem synced up, it aimed for a target noise margin of 6. Later on, the noise has reduced so the data shows your noise margin to be 7.7, but they sync speed is only set at sync time. So you should in theory be able to resync and get a higher speed. Unfortunately, DLM doesn't like resyncs and may change your line parameters which will stop you getting a higher speed.

His tester is maybe not affected by noise margin OR DLM in the same way a modem is.
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Sage
Sage
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Message 7 of 11

Re: Infinity speed issues

As regards the engineers test equipment you are correct Ray. One factory (pinhole for 30 secs) reset by the OP should enable a re-sync without causing problems.

sw30
Beginner
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Message 8 of 11

Re: Infinity speed issues

If I factory reset the HH, how will I tell if the re-sync has had any effect? Would I expect to see a change in the noise margin stats and an increase in the IP profile on the BT speed tester?
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shirts
Recognised Expert
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Message 9 of 11

Re: Infinity speed issues

Do you know where outside, the engineer took the readings ?

 

Is your drop line of the old grey bell wire type ?

 

Normally the drop line from the pole will be connected to a junction box near to where it enters your property. There should be only one other cable connected to this junction box, and this would go to the back of your master socket. There should be no other wiring connected to the back of your master socket. Any extentions you may have should be wired from the back of the removable faceplate. Does your wiring follow this ?

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Sage
Sage
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Message 10 of 11

Re: Infinity speed issues


@sw30 wrote:
If I factory reset the HH, how will I tell if the re-sync has had any effect? Would I expect to see a change in the noise margin stats and an increase in the IP profile on the BT speed tester?

Check your stats in the HH5 before and after.

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