Somewhat co-incidentally, I just read an interesting essay on the whole net neutrality debate, which gives a good explanation of the causes of jitter and network delays in general. You can find it here: http://itpolicy.princeton.edu/pub/neutrality.pdf Gilles On Aug 25, Sean Walberg wrote:
On 8/25/06, *Bill Reid* <billreid@shaw.ca> wrote:
Of course pinging every sec does not simulate a RTP stream.
This reminds me that I set up smokeping to watch for this type of stuff:
Here's a ping to my default route:
http://ertw.com/cgi-bin/smokeping.cgi?target=Gateway
And from home to work (probably going to go via Group Tel/Bell West)
http://ertw.com/cgi-bin/smokeping.cgi?target=Winnipeg <http://ertw.com/cgi-bin/smokeping.cgi?target=Winnipeg>
A fair amount of jitter (represented by the "smoke"), and there is a noticable difference in jitter in August (400 day graph of the Gateway graph), even after the data has been averaged.
Sean
-- Gilles R. Detillieux E-mail: <grdetil@scrc.umanitoba.ca> Spinal Cord Research Centre WWW: http://www.scrc.umanitoba.ca/ Dept. Physiology, U. of Manitoba Winnipeg, MB R3E 3J7 (Canada)