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Author Topic: G.fast v two pc's  (Read 1084 times)

adslmax

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G.fast v two pc's
« on: September 02, 2021, 07:02:52 PM »

I finally found out why G.fast dislike my new AMD Ryzen PC as I lose 35Meg chunk off everytime I powered up the pc, I check again when the pc switched off as it went back to higher sync rate on my old pc Intel Sandybridge i7 2700K pc as I got the dslstats to check it when I switched on and off on my new AMD Ryzen 3700X.

AMD PC switched on:

Downstream 176Meg

AMD PC switched off:

Downstream 211Meg

Both pc switched off: (checking via my mobile phone via Zyxel router sync)

Downstream 237Meg

Can't believe it  :( Why do high end pc caused G.fast big drop in sync rate. Good job I have find out myself.

Can you all users with G.fast check it with pc on and off to see if your G.fast does affect the big drop in sync rate.

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Alex Atkin UK

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Re: G.fast v two pc's
« Reply #1 on: September 02, 2021, 07:29:40 PM »

Are they plugged in near the phone line/router?  Could it be they use crap PSUs that are throwing out a lot of interference?  Are they wired into the router, if so can you try wireless, if not can you try wired?

Clearly some sort of radio frequency interference is being transferred from the PCs to the router, the question is where, why, and is there anything we can do to reduce it?
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adslmax

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Re: G.fast v two pc's
« Reply #2 on: September 02, 2021, 07:37:49 PM »

My PSU sent back to overclockers as it went dead after few months as it was bequiet PSU Gold plus 80 be straight 750W. Link here: https://forums.overclockers.co.uk/threads/bequiet-straight-power-11-gold-80plus-750w-are-dead.18935065/

I am using spare bequiet 600W Bronze 80 plus on my AMD PC.

The two pc's are upstair. Intel pc using wireless 1900AC, AMD pc using ethernet all the way to downstair to the router by the master socket in the hallway.

You could be right could be crappy PSU that cause G.fast drop of 35Meg chunk off. I can't believe it but glad I found out myself.
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bkehoe

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Re: G.fast v two pc's
« Reply #3 on: September 02, 2021, 07:53:54 PM »

I've seen RFI with mine when using a PoE switch - chops around 30MBit off the attainable. Seems to insert the RFI into the cat5 cables which run alongside the phone line

So I use old fashioned POE injectors and my shiny POE switch is just working as a dumb switch.
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meritez

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Re: G.fast v two pc's
« Reply #4 on: September 02, 2021, 11:15:15 PM »

Is this with the zyxel or the Openreach modem?
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adslmax

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Re: G.fast v two pc's
« Reply #5 on: September 02, 2021, 11:18:55 PM »

zyxel
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meritez

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Re: G.fast v two pc's
« Reply #6 on: September 03, 2021, 12:03:14 AM »

If you connect the Openreach modem to the zyxel, does it sync any higher?
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re0

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Re: G.fast v two pc's
« Reply #7 on: September 03, 2021, 12:33:56 AM »

I've not noticed any difference to sync/attainable based on whether my PC is on or off. And, in my case, the computer is about 2m away from the modem/router, and is even closer to the master socket.

I use the EVGA G3 750 with the Ryzen 7 3700X.

I am inclined to believe it is RFI from the PSU. It seems like you've isolated it successfully anyway.
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ISP: Zen - G.fast 330/50

Gigaclear FTTP for 2021? Maybe it's too late.

adslmax

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Re: G.fast v two pc's
« Reply #8 on: September 03, 2021, 03:09:35 AM »

My psu could be rubbish one from bequiet via overclockers due to very poor RFI. By interesting reading here https://www.ukqrm.org.uk/smps.php
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adslmax

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Re: G.fast v two pc's
« Reply #9 on: September 03, 2021, 03:11:38 AM »

I've not noticed any difference to sync/attainable based on whether my PC is on or off. And, in my case, the computer is about 2m away from the modem/router, and is even closer to the master socket.

I use the EVGA G3 750 with the Ryzen 7 3700X.

I am inclined to believe it is RFI from the PSU. It seems like you've isolated it successfully anyway.

You won't noticed any difference because your gfast got the maximum sync rate full on 330/50
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re0

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Re: G.fast v two pc's
« Reply #10 on: September 03, 2021, 05:07:42 AM »

You won't noticed any difference because your gfast got the maximum sync rate full on 330/50
It could still impact the attainable. Anyway, honestly hoping to jump ship from G.fast by the end of the year.
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ISP: Zen - G.fast 330/50

Gigaclear FTTP for 2021? Maybe it's too late.

adslmax

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Re: G.fast v two pc's
« Reply #11 on: September 03, 2021, 05:21:14 AM »

yeah I will quit g.fast next year in May 2022 when my contract has ended will join BT Home Essentials (only use G.fast for 12 months only) then downgrade back to FTTC 80/20 next year. Don't think I wouldn't get any FTTP for a long while yet probably end of 2025!
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adslmax

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Re: G.fast v two pc's
« Reply #12 on: September 03, 2021, 09:00:13 AM »

Stats recorded 03 Sep 2021 08:50:19

DSLAM type / SW version:   BDCM:0xc190 (193.144) / v0xc190
Modem/router firmware:     AnnexA version - A2pvfbH045o.d27j
DSL mode:                  G
Status:                    Showtime
Uptime:                    1 day 3 hours 28 min 49 sec
Resyncs:                   1 (since 03 Sep 2021 08:45:16)
         
            Downstream   Upstream
Line attenuation (dB):     35.3      0.0
Signal attenuation (dB):   35.3      0.0
Connection speed (kbps):   229832      42527
SNR margin (dB):           2.9      2.9
Power (dBm):               0.0      4.1
Interleave depth:                
INP:                       551.00      607.00
G.INP:                     Not enabled      Not enabled
Vectoring status:          Unknown      

RSCorr/RS (%):             0.0016      0.0025
RSUnCorr/RS (%):           0.0000      0.0000
ES/hour:                   0      0
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Alex Atkin UK

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Re: G.fast v two pc's
« Reply #13 on: September 03, 2021, 01:02:03 PM »

My psu could be rubbish one from bequiet via overclockers due to very poor RFI. By interesting reading here https://www.ukqrm.org.uk/smps.php

I got the impression BeQuiet are an okay brand, was using them in my server for years.  Then again PSUs are a pain as every brand has good and bad models.

I'm much more careful about the specific models I buy and getting them from a reputable retailer though after one of my PSUs went up in smoke many years back.
« Last Edit: September 03, 2021, 01:04:20 PM by Alex Atkin UK »
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Ixel

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Re: G.fast v two pc's
« Reply #14 on: September 03, 2021, 05:42:06 PM »

I got the impression BeQuiet are an okay brand, was using them in my server for years.  Then again PSUs are a pain as every brand has good and bad models.

I'm much more careful about the specific models I buy and getting them from a reputable retailer though after one of my PSUs went up in smoke many years back.

Definitely. PSUs are one of the most important components to consider when building a system or replacing a PSU. As a person who has regularly repaired or built computers locally, I've seen my fair share. Definitely go with brands that are reputable, not cheap and cheerful, otherwise it may (worst case) risk the entire system's components going with it if it happens to go 'bang'.
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