[AusNOG] NBN Satellite Latency

[Greg McLennan]

That sounds about right for that type of service. 
Everyone needs to remember the basics when it comes to pinging over a geo satellite. 

Initial ping packet goes up to bird( Lets say 125ms for sake of simplicity).
Packet comes down +125ms
Ping gets processed by device-x!!
Ping response goes back up +125ms
Ping responce comes down +125ms
 The Initiating device displays ping as 500ms in this over simplified solution.



Sent from my Samsung Galaxy Ace 3 on the Telstra 4G network

-------- Original message --------
From: Jason Maude <jason at fusionbroadband.com.au> 
Date:03/02/2017  4:45 PM  (GMT+10:00) 
To: 'Jonathan Brewer' <jon.brewer at gmail.com>,'Paul Wilkins' <paulwilkins369 at gmail.com> 
Cc: ausnog at lists.ausnog.net 
Subject: Re: [AusNOG] NBN Satellite Latency 

We have a heap of NBN Sky muster services running through us.  All are ~600ms to Sydney, regardless of where the end point is (that’s idle latency)  if you load the connections up they can will push out to over 1000ms quickly if there is no shaping.
 
JM
 
 
From: AusNOG [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Jonathan Brewer
Sent: Friday, 3 February 2017 5:23 PM
To: Paul Wilkins
Cc: ausnog at lists.ausnog.net
Subject: Re: [AusNOG] NBN Satellite Latency
 
On 3 February 2017 at 18:39, Paul Wilkins <paulwilkins369 at gmail.com> wrote:
Which is 460ms, almost double what you pay Einstein (240ms). Wonder where it all goes? They would have to be using TDM, because only a time slot delay is going to make that sort of difference. 700ms is pretty awful.
 
460 is a bit light for what you pay for your speed of light journey, not double.
 
Your request goes up 35,786 km, and that takes... 119.3ms
It comes down from the satellite to the earth station, 119.3ms
If all goes perfectly (you land at your content) you spend 1ms on the ground.
Your reply goes up to the satellite, 119.3ms
Your reply comes down from the satellite, 119.3ms
 
Einstein says the best you're going to do is 478 ms.
 
700 isn't great and I kind of doubt that's normal based on my observations. Best get some real data from someone who is measuring it in a controlled fashion before you have a whinge about it being awful.
 
-JB
 
 
 
 
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