High upstream attenuation on new 80/20 FTTC connection
- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Printer Friendly Page
- Plusnet Community
- :
- Forum
- :
- Help with my Plusnet services
- :
- Fibre Broadband
- :
- High upstream attenuation on new 80/20 FTTC connec...
High upstream attenuation on new 80/20 FTTC connection
19-07-2016 2:56 PM
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Highlight
- Report to Moderator
Hello, I've very recently upgraded from ADSL to the 80/20 FTTC product.
I'm most likely one of the first connections as the cabinet has just gone live after a very long wait !
The following connection speed ranges were forecast for my line (and given by Plusnet in my upgrade offer)
VDSL Range A (Clean) Downstream 52.8 to 68.2 Mbps and Upstream 12.3 to 18.2 Mbps
My reported BRAS (from Openreach tests) profile is 40.5 Mbps Downstream and 20 Mbps Upstream.
However I'm getting the following from my TPlink TD-W9970 router
Upstream Current Rate 9466 Kbps Max Rate 9471 kbps SNR Margin 5.1 dB
Downstream Current Rate 46870 kbps Max Rate 55414 kbps SNR Margin 5.8 dB
Upstream Line Attenuation 38.8 dB Packet Errors 0
Downstream. Line Attenuation 17.2 dB Packet Errors 0
Which is less than forecast. The key factor appears to be the very high upstream attenuation.
I've changed routers, connected directly to the "real" master socket behind the NTE ADSL faceplate with an external filter (to eliminate any impact of extension wiring and/or filter problems in the ADSL faceplate) and all the results are almost identical.
I've spoken to Plusnet support and provided the same background data but I've had a range of differing comments the last comment that I'm on the wrong "profile" and that will be changed to 80/20.
I think the reason for the lower than expected upstream speed is due the 38dB attenuation figure compared to the 17.2 dB downstream figure.
I'd be most grateful for any advice on how to get my connection performing closer to predicted figures (especially the upstream) and the best way to work with Plusnet to this aim !
Many thanks
Re: High upstream attenuation on new 80/20 FTTC connection
19-07-2016 4:02 PM
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Highlight
- Report to Moderator
UPDATE
I've just been told by Plusnet Customer Service
Question #129543671
Response
"I have tested your connection today and have found no further issues since raising fault, the connection is up and running and speeds are running within estimates."
This is not true as both the upstream and downstream connection speeds are below the lowest estimates provided in their response.
I'm not impressed.
Re: High upstream attenuation on new 80/20 FTTC connection
19-07-2016 6:10 PM
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Highlight
- Report to Moderator
Re: High upstream attenuation on new 80/20 FTTC connection
19-07-2016 6:49 PM
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Highlight
- Report to Moderator
Upstream attenuation often is higher than downstream attenuation for FTTC. Higher frequencies have higher attenuation, and the first large upstream band of frequencies is higher than the first large downstream band.
I'm not sure why Plusnet apparently quoted you the A range of speeds, self-install ought to quote the B range of speeds really. BT Consumer's "minimum guaranteed speed" is the middle of the B range.
Would a lower estimate have made a difference in your decision to upgrade (or a different ISP might have had a more suitable offering)?
Re: High upstream attenuation on new 80/20 FTTC connection
20-07-2016 2:05 PM
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Highlight
- Report to Moderator
After talking to Plusnet last night they have updated me to tell me the SVLAN I'm on is experiencing high utilisation - and that ihas been passed to the Complex team for action. I've also signed up with Think broadband quality monitor which is also showing about 5% lost packets :(. Which would explain problems with VoIP.
Any thoughts from the community ?
Re: High upstream attenuation on new 80/20 FTTC connection
20-07-2016 3:18 PM
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Highlight
- Report to Moderator
A hot SVLAN can give packet loss and thus low speeds during peak periods.
But it shouldn't have any effect on your synch speed.
- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Printer Friendly Page
- Plusnet Community
- :
- Forum
- :
- Help with my Plusnet services
- :
- Fibre Broadband
- :
- High upstream attenuation on new 80/20 FTTC connec...