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Contributor
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Message 11 of 32

Re: Higher line attenuation & lower speed after BT Hub 6 Firmware upgrade to SG4B1000E020 on

The mystery continues.  Something sounds a bit  Not-Right,,,,,Will be interesting to see how this pans out...

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Aspiring Contributor
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Message 12 of 32

Re: Higher line attenuation & lower speed after BT Hub 6 Firmware upgrade to SG4B1000E020 on

Very interesting - do you know whether your Line and Signal Attenuations significantly increased at the same time as the speed dropped after the firmware upgrade? if so you had very similar / the same symptoms as I and several others in the BT Community ... plus you've suggested a few more symptoms that an Openreach technician might check - your solution is a glimmer of hope! Thx.
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Aspiring Contributor
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Message 13 of 32

Re: Higher line attenuation & lower speed after BT Hub 6 Firmware upgrade to SG4B1000E020 on

I called the BT help line this morning and had a brief conversation with a very helpful person who confirmed that in BT's systems my line performance has halved it's speed and is now just below the minimum expected for my line and, more significantly, that the metric called "stability" in their system is at status "red". The DSL signal is not dropping out - my hub reports that the DSL signal has been up for over 5 days.  Can any guru / expert in the community throw any light on what this "stability" metric refers to? (the guy on  the phone wasn't sure).

Is there a connection between significant reduction id line speed, poor "stability", sudden increase in hub reported line/signal attenuations, higher than normal noise margins? Expert input required, please...

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Aspiring Contributor
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Message 14 of 32

Re: Higher line attenuation & lower speed after BT Hub 6 Firmware upgrade to SG4B1000E020 on

Really sorry, didn't get exact numbers but it only affected my download speed.

Upload seemed to be fine. I've still got the faulty hub, so I'll fire it up tomorrow and get as much from it as I can.

 

Also OpenReach showed me a table of daily connection speeds on their system for my line and it's fine up until the 2nd April.

 

Somehow that firmware update caused this 3v A/C noise on the line.

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Aspiring Contributor
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Message 15 of 32

Re: Higher line attenuation & lower speed after BT Hub 6 Firmware upgrade to SG4B1000E020 on

Here you go... This is the Hub6 with the firmware update

 

Product name:

BT Hub 6A

Serial number:

+084319+NQ73138190

Firmware version:

SG4B1000E020

Firmware updated:

02-Apr-2020

Board version:

1.0

Gui version:

1.115.0

DSL uptime:

0 Days, 0 Hours 2 Minutes 18 Seconds

Data rate:

8.13 Mbps / 18.73 Mbps

Maximum data rate:

8131 / 27909

Noise margin:

6.1 dB / 13.5 dB

Line attenuation:

23.2 dB

Signal attenuation:

26.5 dB / 23.2 dB

VPI / VCI:

0/38

Modulation:

G_993_2_ANNEX_B

Latency type:

Fast Path

Data sent / received:

705 kB Uploaded / 4 MB Downloaded

Broadband username:

bthomehub@btbroadband.com

BT Wi-fi:

Active

2.4 GHz wireless network name:

HAL9000

2.4 GHz wireless channel:

Smart (Channel 6)

5 GHz wireless network name:

HAL9000

5 GHz wireless channel:

Smart (Channel 36)

Wireless security:

WPA2 (Recommended)

Wireless mode:

Mode 1

Firewall:

On

MAC address:

58:90:43:08:4C:71

Software variant:

-

Boot loader:

7.33.1

 

speed.png

 

 

 

 

I'll swap for the new hub is a sec and repost.

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Aspiring Contributor
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Message 16 of 32

Re: Higher line attenuation & lower speed after BT Hub 6 Firmware upgrade to SG4B1000E020 on

And with the Home Hub 5...

It isn't as good as a connection as I got yesterday. (Today 32863) It would normally get a bit better after a few days, around about 40000.

 

1. Product name: BT Home Hub
2. Serial number: +076272+NQ53204503
3. Firmware version: Software version 4.7.5.1.83.8.264 (Type A) Last updated 15/04/20
4. Board version: BT Hub 5A
5. DSL uptime: 0 days, 00:08:33
6. Data rate: 7943 / 32863
7. Maximum data rate: 7951 / 44545
8. Noise margin: 6.2 / 10.2
9. Line attenuation: 27.2 / 26.6
10. Signal attenuation: 27.3 / 24.1
11. Data sent/received: 4.0 MB / 27.6 MB
12. Broadband username: bthomehub@btbroadband.com
13. BT Wi-fi: Yes
14. 2.4 GHz Wireless network/SSID: HAL9000
15. 2.4 GHz Wireless connections: Disabled
16. 2.4 GHz Wireless security: WPA2
17. 2.4 GHz Wireless channel: Automatic (Smart Wireless)
18. 5 GHz Wireless network/SSID: HAL9000
19. 5 GHz Wireless connections: Disabled
20. 5 GHz Wireless security: WPA2
21. 5 GHz Wireless channel: Automatic (Smart Wireless)
22. Firewall: Default
23. MAC Address: a0:1b:29:72:53:ba
24. Modulation: G.993.2 Annex B
25. Software variant: AA
26. Boot loader: 1.0.0

speed.png

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Aspiring Contributor
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Message 17 of 32

Re: Higher line attenuation & lower speed after BT Hub 6 Firmware upgrade to SG4B1000E020 on

Thanks for the data before and after - glad your new hub has improved your speed. The line attenuation seems similar before and after - this whole apparent firmware issue is very puzzling - I'm hoping that a Sage / guru / BT Moderator will comment on the above posts and help explain...
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Aspiring Contributor
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Message 18 of 32

Re: Higher line attenuation & lower speed after BT Hub 6 Firmware upgrade to SG4B1000E020 on

I know this isn't that helpful, but I just connected at 43069... this was about the speeds achieved before 2nd April.

The replacement HUB6 should be here sometime today. Is there a way I can stop it from updating to test?

1. Product name: BT Home Hub
2. Serial number: +076272+NQ53204503
3. Firmware version: Software version 4.7.5.1.83.8.264 (Type A) Last updated 15/04/20
4. Board version: BT Hub 5A
5. DSL uptime: 0 days, 00:06:53
6. Data rate: 7894 / 43069
7. Maximum data rate: 7902 / 47206
8. Noise margin: 6.0 / 6.0
9. Line attenuation: 27.2 / 26.7
10. Signal attenuation: 27.3 / 24.3
11. Data sent/received: 3.1 MB / 9.4 MB
12. Broadband username: bthomehub@btbroadband.com
13. BT Wi-fi: Yes
14. 2.4 GHz Wireless network/SSID: HAL9000
15. 2.4 GHz Wireless connections: Disabled
16. 2.4 GHz Wireless security: WPA2
17. 2.4 GHz Wireless channel: Automatic (Smart Wireless)
18. 5 GHz Wireless network/SSID: HAL9000
19. 5 GHz Wireless connections: Disabled
20. 5 GHz Wireless security: WPA2
21. 5 GHz Wireless channel: Automatic (Smart Wireless)
22. Firewall: Default
23. MAC Address: a0:1b:29:72:53:ba
24. Modulation: G.993.2 Annex B
25. Software variant: AA
26. Boot loader: 1.0.0

 

speed.png

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Aspiring Expert
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Message 19 of 32

Re: Higher line attenuation & lower speed after BT Hub 6 Firmware upgrade to SG4B1000E020 on

I acquired a brand new HH6 at the end of December and the first thing I did was check and copy the Hub stats. As you can see, it had already downloaded and installed firmware at just 9 minutes into being powered up.

 

  

Firmware version:
SG4B1000B540

Firmware updated:
29-Dec-2019

Board version:
1.0

Gui version:
1.64.0

DSL uptime:
0 Days, 0 Hours 9 Minutes 52 Seconds

Data rate:
15.60 Mbps / 55.69 Mbps

Maximum data rate:
15769 / 56606

Noise margin:
6.1 dB / 6.3 dB

Line attenuation:
12.9 dB

Signal attenuation:
VPI / VCI:
0/38

Modulation:
G_993_2_ANNEX_B

Latency type:
Fast Path

Data sent / received:
16 MB Uploaded / 82 MB Downloaded

Following this there was further update in March and as many report, the attenuation figures are much higher immediately following this.

Firmware version:
SG4B1000E020

Firmware updated:
13-Mar-2020

Board version:
1.0

Gui version:
1.115.0

DSL uptime:
2 Days, 3 Hours 5 Minutes 3 Seconds

Data rate:
15.84 Mbps / 55.34 Mbps

Maximum data rate:
16152 / 56236

Noise margin:
6.3 dB / 6.3 dB

Line attenuation:
18.8 dB

Signal attenuation:
12 dB / 18.8 dB

VPI / VCI:
0/38

Modulation:
G_993_2_ANNEX_B

Latency type:
Fast Path

Data sent / received:
228 MB Uploaded / 5 GB Downloaded

The thing is though, nothing the HH can do can influence the actual line characteristic regarding its attenuation factor and so on. That all makes me wonder whether this different attenuation factor we are seeing is actually a result of the firmware changing the way the values are measured/reported/interpreted.

In fact the line entry of 'Signal Attenuation' is set out differently which might add some weight to that theory.

Nothing on the line can have changed following the firmware install. It is the same line before the install as before.

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Aspiring Contributor
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Message 20 of 32

Re: Higher line attenuation & lower speed after BT Hub 6 Firmware upgrade to SG4B1000E020 on

Thank you , Mooly, for your helpful reply. I think that your hypothesis about a different algorithm or definition of "attenuation"  in the new firmware is possible, especially given the change in labeling of these data in the hub's reports. I agree that the hub cannot, itself, affect the line attenuation so this might well be the answer to that part of the puzzle (leaving aside why such a simple characteristic of a data line might increase so massively! - in my case by a factor of more than 64 times! (attenuation doubles for every 3.01 dB increase so my 19dB increase is equivalent to more than 6 doublings, i.e. 2^6 = 64 times).

My fundamental problem is that my speed has dropped from 38+ Mbps to 26 Mbps or lower.  BT report that the metric called "stability" in their system is at status "red" and my speed is at the lower threshold of what they expect (the DSL signal is not dropping out - my hub reports that the DSL signal has been up for >6 days) but BT have no idea why. The hub has reported the exact same speed for the last 6 days: 26.43Mbps, the same each day to the hundredth of a Mbps - that seems extraordinary and very unlikely to be a correct reading of a speed recalculated in real time by the hub. It suggests that the speed data are not being updated in the hub's log after it has initially calculated a speed after re-boot of the hub. My actual usable speed as measured by an app on a device is around 17 or 18 Mbps.

Have you any thoughts on this conundrum?

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