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Standard User ToneDeaf
(member) Mon 28-Mar-16 12:45:39
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Effects of PhyR Setting on Zyxel Gateway


[link to this post]
 
G.INP appears to have been rolled out to my local ECI cabinet during the past week as I now see 49 symbols of downstream INP applied.

I have also lost around 1.5Mbps of downstream sync along with 0.5db increase in SNR margin.

I have a setting on my Zyxel gateway (SBG3300) to switch on/off upstream and downstream PhyR. This does not appear to make much difference for short term testing.

Has anyone else views on this or experimented with this setting?


VDSL Training Status: Showtime
Mode: VDSL2 Annex B
VDSL Profile: Profile 17a
Traffic Type: PTM Mode
Link Uptime: 1 day: 18 hours: 9 minutes
============================================================================
VDSL Port Details Upstream Downstream
Line Rate: 5.900 Mbps 28.411 Mbps
Actual Net Data Rate: 5.881 Mbps 28.412 Mbps
Trellis Coding: ON ON
SNR Margin: 6.3 dB 6.6 dB
Actual Delay: 0 ms 0 ms
Transmit Power: 2.9 dBm 13.0 dBm
Receive Power: -9.7 dBm -13.3 dBm
Actual INP: 0.0 symbols 49.0 symbols
Total Attenuation: 12.6 dB 26.3 dB
Attainable Net Data Rate: 5.992 Mbps 29.700 Mbps
============================================================================
VDSL Band Status U0 U1 U2 U3 D1 D2 D3
Line Attenuation(dB): 5.0 47.0 65.1 N/A 21.0 57.6 89.4
Signal Attenuation(dB): 4.9 47.0 N/A N/A 25.0 57.3 N/A
SNR Margin(dB): 8.4 6.2 N/A N/A 6.6 6.6 N/A
Transmit Power(dBm):- 4.9 2.1 N/A N/A 11.6 7.3 N/A

Zen Unlimited Fibre 1 - 30/6
Standard User WWWombat
(knowledge is power) Mon 28-Mar-16 18:19:50
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Re: Effects of PhyR Setting on Zyxel Gateway


[re: ToneDeaf] [link to this post]
 
IIRC, PhyR is the Broadcom-specific precursor to the standardised G.INP. Settings for PhyR don't affect G.INP, or vice-versa.
Standard User Tacitus
(experienced) Mon 28-Mar-16 19:03:29
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Re: Effects of PhyR Setting on Zyxel Gateway


[re: WWWombat] [link to this post]
 
In reply to a post by WWWombat:
IIRC, PhyR is the Broadcom-specific precursor to the standardised G.INP. Settings for PhyR don't affect G.INP, or vice-versa.
If PhyR in the Broadcom based Router is BroadCom specific and the cabinet (Huawei 288) is also Broadcom based, will it make any difference under that scenario?


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Standard User WWWombat
(knowledge is power) Mon 28-Mar-16 20:07:42
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Re: Effects of PhyR Setting on Zyxel Gateway


[re: Tacitus] [link to this post]
 
BT aren't making use of Broadcom's implementation of PhyR at all. Just G.INP.
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