General Discussion
  >> Fibre Broadband


Register (or login) on our website and you will not see this ad.


Pages in this thread: 1 | [2] | 3 | (show all)   Print Thread
Standard User WilliamGrimsley
(committed) Mon 20-Mar-17 08:23:15
Print Post

Re: Strange Downstream SNR Margin


[re: RobertoS] [link to this post]
 
I can confirm it's nothing in the house and the phone was not used during these blips. Anyway, it's been dropped to 4 dB now so obviously it's not causing a problem.
Standard User TheEulerID
(experienced) Mon 20-Mar-17 08:43:43
Print Post

Re: Strange Downstream SNR Margin


[re: WilliamGrimsley] [link to this post]
 
A reduction in the SNR margin will only cause throughput issues if there is an increase in uncorrectable errors requiring a retransmit. It would be best to monitor error rates to see if there is a correlation.

As for what's causing fluctuations, both long and short term, then the former is normally down to things like atmospherics whilst short term fluctuation cans be caused by any number of sources of EMF.
Standard User WilliamGrimsley
(committed) Mon 20-Mar-17 08:47:26
Print Post

Re: Strange Downstream SNR Margin


[re: TheEulerID] [link to this post]
 
I understand that, there were no errors but the amount G.INP retransmits going on would suggest the reduction in throughput.


Register (or login) on our website and you will not see this ad.

Standard User Icaras
(experienced) Mon 20-Mar-17 18:20:21
Print Post

Re: Strange Downstream SNR Margin


[re: WilliamGrimsley] [link to this post]
 
In reply to a post by WilliamGrimsley:
I understand that, there were no errors but the amount G.INP retransmits going on would suggest the reduction in throughput.


You really need to stop obsessing about your connection.
Standard User WilliamGrimsley
(committed) Mon 20-Mar-17 18:41:29
Print Post

Re: Strange Downstream SNR Margin


[re: Icaras] [link to this post]
 
It may come over that way, but I'm not.
Standard User TheEulerID
(experienced) Mon 20-Mar-17 18:56:14
Print Post

Re: Strange Downstream SNR Margin


[re: WilliamGrimsley] [link to this post]
 
g.inp retransmissions are errors, just corrected ones, so if that is getting very high it could affect throughput to some extent, but high is the operative word. It would be transparent to the IP layer, so would not cause the sort of problems you see with packet loss, so it would never be that marked.
Standard User WilliamGrimsley
(committed) Mon 20-Mar-17 21:01:35
Print Post

Re: Strange Downstream SNR Margin


[re: TheEulerID] [link to this post]
 
I already know that (that's meant in a positive not targeting way). smile
Standard User MrDiode
(learned) Mon 20-Mar-17 23:55:40
Print Post

Re: Strange Downstream SNR Margin


[re: WilliamGrimsley] [link to this post]
 
Just looking into your history you mentioned that you use ethernet power line adapters they are not the cleanest way to connect to a modem it has drawbacks increased FEC errors which is extra noise and can only guess that is what is causing your upstream to bounce from g.inp to fastpath and downstrean to sometimes enter the interleaving profile.

Would get rid of any ethernet powerline adapters and see how your line performs over 2 weeks.
Standard User WilliamGrimsley
(committed) Tue 21-Mar-17 09:04:17
Print Post

Re: Strange Downstream SNR Margin


[re: MrDiode] [link to this post]
 
I wish I didn't have to use them, but unfortunately we have to for our BT TV service.
Standard User lee111s
(experienced) Tue 21-Mar-17 09:12:29
Print Post

Re: Strange Downstream SNR Margin


[re: WilliamGrimsley] [link to this post]
 
NTE shift?
Pages in this thread: 1 | [2] | 3 | (show all)   Print Thread

Jump to