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Message 1 of 18

Line Attenuation

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My line attenuation has jumped from 26dB to 45.2dB... speed down to what I used to have on ADSL 2+! My line attenuation is also the same as what I had on ADSL 2+!
 
This happened right after some Openreach engineers were working in the BT manhole across the road. Could it be that I've been moved down to ADSL 2+ because of instability?
 
 
Product name:

BT Hub 6A

Serial number:

+084316+NQ94590721

Firmware version:

SG4B1000E020

Firmware updated:

20-Mar-2020

Board version:

1.0

Gui version:

1.115.0

DSL uptime:

0 Days, 2 Hours 49 Minutes 5 Seconds

Data rate:

0.96 Mbps / 19.25 Mbps

Maximum data rate:

1956 / 21572

Noise margin:

6.1 dB / 3.1 dB

Line attenuation:

45.2 dB

Signal attenuation:

29.2 dB / 45.2 dB

VPI / VCI:

0/38

Modulation:

G_993_2_ANNEX_B

Latency type:

Fast Path

Data sent / received:

445 MB Uploaded / 2 GB Downloaded

Broadband username:

bthomehub@btbroadband.com

BT Wi-fi:

Active

2.4 GHz wireless network name:

BT

2.4 GHz wireless channel:

Smart (Channel 11)

5 GHz wireless network name:

BT

5 GHz wireless channel:

Smart (Channel 36)

Wireless security:

WPA2 (Recommended)

Wireless mode:

Mode 1

Firewall:

On

MAC address:

5C:B1:3E:16:4A:1B

Software variant:

-

Boot loader:

0.48.8-sec

 

Capture.PNG

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17 REPLIES 17
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Message 2 of 18

Re: Line Attenuation

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G993.2 annex B - the VDSL2 specification. So no, you haven't been reverted to ADSL.

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Message 3 of 18

Re: Line Attenuation

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Thank you. Do you know any other reason that my line attenuation has jumped from 26dB to 45dB?

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Message 4 of 18

Re: Line Attenuation

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Offhand and not being to test your line myself, no.

If its not causing you problems don't worry about it.

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Message 5 of 18

Re: Line Attenuation

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I note that your hub's firmware was updated 5 days before your post to version SG4B1000E020. After the same upgrade my speed dropped from 38+ Mbps to 26 Mbps and the line attenuation leapt from 26 dB to 45 dB ... similar to your experience? (see my post at https://community.bt.com/t5/BT-Fibre-broadband/Higher-line-attenuation-amp-amp-lower-speed-after-BT-...).  I wonder if that's a coincidence or if there is something in that firmware upgrade that has affected the line characteristics...?

 

 

 

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Message 6 of 18

Re: Line Attenuation

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It must be firmware, I have recently upgraded to a third party TP-Link router.

All of my problems are solved and I am now getting 38mb/s, faster than ever. Sometimes, speed peaks at 44 mb/s.

Line attenuation now 17.9db, down from 45+.

I really recommend it, 2 minute set up and modem is built in.

I was getting frustrated with BT problems, but it is not the networks' fault... it is their hubs!

Screenshot_20200412-122100_Chrome.jpg

 before new router

Screenshot_20200412-121842_Chrome.jpg

After new router... TP link

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Message 7 of 18

Re: Line Attenuation

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Thanks for that info, Octopus16 - that is strong circumstantial evidence that the upgrade is to blame and that the "true" line attenuation and speed that may be achieved, is really unchanged...
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Message 8 of 18

Re: Line Attenuation

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Plus, I'm using my old BT Smart Hub as an access point!

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Message 9 of 18

Re: Line Attenuation

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Does a new router help if the connection is somehow appear banded ? Banding is done not on the router is it ? Or will it reset the connection from scratch ?

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Message 10 of 18

Re: Line Attenuation

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That firmware update has caused these issues.  There are quite a few on here with the same problem ( which I also have )

Maybe, just maybe is was designed to throttle back the whole BT  band width to allow more users working from home to get access during this Covid-19 issue..   Who knows, but when that update happened things changed for lots of people and depending how good your speed was before you may not of noticed it, but lots have...

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