Broadband Related > Broadband Technology
SNR Margin & G.fast
Bowdon:
If the target SNR margin is reduced to 3dB would this increase the speed & reach of G.fast?
I'm kinda assuming that when people talk about the distance reach of G.fast that its all based on the SNR margin being 6dB.
burakkucat:
G.Fast is ITU-T specifications G.9700 and G.9701.
I have not given any consideration to target SNRM, only the duplex method (time division). Perhaps you could research the information given in the above links? :-\
Bowdon:
That's way over my head :)
I let the cats kitz and wombats to figure that stuff out. I'm just the dopey dog always asking questions ;D
I was wondering, seen as G.fast has vectoring built in, if I was to sign up for G.fast I wonder if my line would become vectored, so that in itself might make it more stable. I'm not sure about the G.INP and SNR margin as they would come from the cabinet, as far as I know.
burakkucat:
--- Quote from: Bowdon on March 20, 2017, 06:11:46 PM ---I was wondering, seen as G.fast has vectoring built in, . . .
--- End quote ---
Vectoring is mandatory for G.Fast.
--- Quote --- . . . if I was to sign up for G.fast I wonder if my line would become vectored, . . .
--- End quote ---
Vectoring would be applied to the circuit.
--- Quote ---so that in itself might make it more stable.
--- End quote ---
Can one equate the minimisation of cross-talk with stability? :-\ That is a good question.
--- Quote ---I'm not sure about the G.INP and SNR margin as they would come from the cabinet, as far as I know.
--- End quote ---
Let us assume that you are provided with a service which makes use of the G.Fast process. It would be provided from a "side-pod", attached to the PCP through which your circuit is routed. Unlike the case where one migrates from a G.992.5 to a G.993.2 service, which relies upon a low-pass filter in the "fibre" cabinet in stopping the exchange based G.992.5 service in reaching the end-user's CPE, I would expect the G.993.2 service to be explicitly terminated and disconnected from the circuit. All features of the G.Fast circuit's mode of operation would be controlled by the electronics in the PCP "side-pod".
PhilipD:
Hi
I would think the low pass filter is also in the G.Fast pod as you don't want the signal travelling back towards the exchange. How they connect up will work in the same way as FTTC except G.Fast is just that much closer to the PCP. Having the pod on the PCP will also reduce distance for many people, at my old address the PCP was a good 20 metres away from the FTTC cabinet, so adding 20 metres of distance, at my new address it's around 10 metres. With G.Fast being more distance dependent than anything they've hacked across decades old telephone cable before, saving just a few metres of distance will make a considerable difference. Presumably why they've gone for attaching the POD on the PCP rather than extending the FTTC cabinet, which would be easier as the power and fibre is already there.
Regards
Phil
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