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Standard User bobm11
(newbie) Mon 28-Aug-17 10:41:01
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G.INP symbols


[link to this post]
 
I have an ASUS-DSL-AC88U on a G.Fast connection.

I am trying to make sense of the symbols reading for G.INP. On the downstream it seems to vary between 535 and 607. The upstream remains constant at 535.

Full set of stats below.

Although it is synching at the full rate I am working on my PC as the BTW checker is showing around 260Mbs and the TBB one shows around 140Mbps

Router Stats
Standard User WWWombat
(knowledge is power) Mon 28-Aug-17 15:23:08
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Re: G.INP symbols


[re: bobm11] [link to this post]
 
Lesson: Don't trust the screen output for an Asus VDSL2 modem.

In fact, the better lesson is to just not trust the Asus VDSL2 modem full stop.
Standard User AndyPandy
(fountain of knowledge) Tue 29-Aug-17 09:35:03
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Re: G.INP symbols


[re: bobm11] [link to this post]
 
Out of interest, how far are you from the PCP, and what sort of speeds did you get in FTTC?


ZeN Unlimited Fibre 2
Fritz!Box 3390


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Standard User lee111s
(fountain of knowledge) Tue 29-Aug-17 09:37:22
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Re: G.INP symbols


[re: AndyPandy] [link to this post]
 
With an attenuation of 0, I expect within 50m.

Nothing short of 80/20 on FTTC I suspect.
Standard User bobm11
(newbie) Tue 29-Aug-17 09:39:02
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Re: G.INP symbols


[re: AndyPandy] [link to this post]
 
Cable length is 110 metres. 40 metres overhead with four (!) DPs enroute and then 70 metres underground.

Got 76/16 on Infinity 2.
Standard User AndyPandy
(fountain of knowledge) Tue 29-Aug-17 10:25:14
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Re: G.INP symbols


[re: bobm11] [link to this post]
 
Thanks - interesting smile


ZeN Unlimited Fibre 2
Fritz!Box 3390
Standard User WWWombat
(knowledge is power) Tue 29-Aug-17 13:52:15
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Re: G.INP symbols


[re: bobm11] [link to this post]
 
Expect a real attenuation of around 5dB.

And attainable speeds of perhaps 120/35 Mbps.

More areas where the output of the Asus isn't to be trusted.
Standard User BatBoy
(sensei) Tue 29-Aug-17 13:58:13
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Re: G.INP symbols


[re: WWWombat] [link to this post]
 
Surely attainable speeds will be higher than the sync speeds?
Standard User WWWombat
(knowledge is power) Tue 29-Aug-17 14:02:28
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Re: G.INP symbols


[re: WWWombat] [link to this post]
 
Ugh. Missed that it was G.Fast.

There's little publicly known about the line profile used on G.Fast lines. In fact, these might well be the first figures I've seen on here.

I believe that retransmission should be used, but we know little beyond that.
Standard User bobm11
(newbie) Tue 29-Aug-17 14:04:11
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Re: G.INP symbols


[re: WWWombat] [link to this post]
 
Which brings me back to part of my original post...

Both the BTW speedchecker and the Ookla one give me an average speed of 250-260Mbps while the one on this site is nearer 130Mbps. (All via a Cat 7 cable)

All three gave near identical results to each other when I had FTTC.

I'm working on the PC to see what I can tweak. Sadly I don't have a second PC to test further and the PC I do have only has 2.4Mhz wireless.

My phone regularly hits 260-280Mbps on 5Mhz.

All tests agree on 35-40 for upload speed.

And I still don't know if G.INP at 607 symbols is giving a light touch or make a more determined effort.
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