G.fast question

Does G.fast reduced massive speed chunk off in Autumn & Winter season? Because I only got G.fast for nearly 4 months now.

Higher speed I get in July & August are 237/42 but it now reduced to 209/31 as SNR remain the same as before both on 3.1dB

============================================================================
xDSL Training Status: Showtime
Mode: G.fast Annex A
Traffic Type: PTM Mode
Link Uptime: 2 days: 11 hours: 36 minutes
============================================================================
xDSL Port Details Upstream Downstream
Line Rate: 31.293 Mbps 209.837 Mbps
Actual Net Data Rate: 31.139 Mbps 209.377 Mbps
Trellis Coding: ON ON
SNR Margin: 3.1 dB 2.9 dB
Actual Delay: 0 ms 0 ms
Transmit Power: 4.1 dBm 0.0 dBm
Receive Power: 4.7 dBm 3.0 dBm
Actual INP: 535.0 symbols 550.0 symbols
Attainable Net Data Rate: 31.529 Mbps 209.669 Mbps
============================================================================

Edited by adslmax (Wed 15-Sep-21 11:57:22)

My FTTC speed varies by two or three meg between summer and winter. I would expect G.Fast to be affected more, given that it uses higher frequencies and is more sensitive to the characteristics of the line.

In the 3 years been using it I haven't noticed any meaningful change between seasons, just like all the previous years on fttc (at least 6 or 7).

Edit to say....I don't look at stats, don't care about them unless there is a clear and obvious reason to do so.. The odd speediest confirms all working as does a clear BQM.

Edited by NGDragon (Wed 15-Sep-21 18:12:24)

In reply to a post by adslmax:

Does G.fast reduced massive speed chunk off in Autumn & Winter season?

Temperature seems to affect communication over twisted copper pairs. Might be more effects if you are overhead fed versus underground fed. Hence the future is optical fibre, light over glass isn't affected.

Thanks all. Because when I was on FTTC for 7 years on it, the Spring / Summer / Autumn and Winter season doesn't affect at all. It always stay at 79999/19999. I understand G.fast use very high frequencies and SRA with FRA as well. Slightly different technology to VDSL2.

Did you check if your "max attainable" values went up and down though?

If your attainable speed is >80/20, then Openreach clamp it at those values anyway.

When I had G.fast my speed was about 120mbs in the winter and then 103mbs in the summer.
My line hated the higher temperature.

Also mine line would drop approx. 3mbs DL and 0.5mbs upload for each new G.fast connection on the cab in the end I ended up with under 100mbs, so Vectoring is next to useless on it...

Unless you can see the cab out of your window it's useless and rubbish..

I'm well shot of G.fast and have Virgin FTTP.

Virgin isn't FTTP (it copper core coaxial cable ran to your house from the street cabinet)

In reply to a post by adslmax:

Virgin isn't FTTP (it copper core coaxial cable ran to your house from the street cabinet)

You should look up Project Lightning where Virgin has expanded their network. In these locations they have used FTTP to the home and have a converter mounted on the outside wall that takes the fibre and outputs a coax cable. Virgin need to use this to be able to sell their existing TV services, so they also use the cable modem. It is known as RFoG (Radio Frequency over Glass) as DOCSIS is a radio frequency based signal.

In reply to a post by adslmax:

Virgin isn't FTTP (it copper core coaxial cable ran to your house from the street cabinet)

I’m pretty sure he means Virgin RFoG (RF over Glass) which technically is fibre to the premises, albeit it still uses DOCSIS 3 technology (like their traditional hybrid fibre coax network which you’re thinking of) and the fibre terminates into an RFoG modem situated in the equivalent of a CSP box on the outside wall of ones home and runs via a coaxial cable internally to a Virgin DOCSIS cable modem.

In future Virgin are actually moving to a more “classic” FTTP - they announced in July their entire network would be upgraded to full fibre by 2028.