[ntp:questions] wedge scattergram questions

Richard B. Gilbert rgilbert88 at comcast.net
Tue Jun 5 11:18:28 UTC 2007

Werner Siedenburg wrote:
> Hello! In Mr. Mills' book I saw some interesting "wedge scattergrams".
> I have some questions about them:
> 1. What is the exact use of these scattergrams?
> Mr. Mills writes that "the shape of the wedge reveals intimate details about
> the network path characteristics". How? The only thing I notice: The further
> left the
> apex of the scattergram is, the better (because of lower delay). What else
> can you see
> in them?
> 2. I understand that "under low traffic conditions, the points are
> concentrated about the apex of the wedge and begin to extend rightward along
> the limb lines as
> network traffic increases".
> But why is the most accurate offset measured at the lowest delay?

Because the maximum error in transmitting time from server to client is 
one half of the round trip delay!  It's usually better but can't be any 

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