Speechless.......
From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Greg Ihnen Sent: Wednesday, September 22, 2010 10:36 PM To: WISPA General List Subject: Re: [WISPA] Carrier pigeons faster then rural wierless? Another factor for us is contention. Our service provider's bandwidth is oversold. So the packets have to wait. We've used a couple of different providers and three different satellites and I don't think I've ever seen a sub 600ms ping. This is typical 64 bytes from 204.9.163.162: icmp_seq=0 ttl=55 time=704.483 ms 64 bytes from 204.9.163.162: icmp_seq=1 ttl=55 time=714.199 ms 64 bytes from 204.9.163.162: icmp_seq=2 ttl=55 time=787.396 ms Request timeout for icmp_seq 3 64 bytes from 204.9.163.162: icmp_seq=3 ttl=55 time=1112.983 ms 64 bytes from 204.9.163.162: icmp_seq=4 ttl=55 time=782.692 ms 64 bytes from 204.9.163.162: icmp_seq=5 ttl=55 time=750.974 ms 64 bytes from 204.9.163.162: icmp_seq=6 ttl=55 time=779.276 ms 64 bytes from 204.9.163.162: icmp_seq=7 ttl=55 time=700.175 ms 64 bytes from 204.9.163.162: icmp_seq=8 ttl=55 time=817.610 ms 64 bytes from 204.9.163.162: icmp_seq=9 ttl=55 time=738.686 ms 64 bytes from 204.9.163.162: icmp_seq=10 ttl=55 time=687.690 ms 64 bytes from 204.9.163.162: icmp_seq=11 ttl=55 time=936.863 ms 64 bytes from 204.9.163.162: icmp_seq=12 ttl=55 time=1325.409 ms 64 bytes from 204.9.163.162: icmp_seq=13 ttl=55 time=842.547 ms 64 bytes from 204.9.163.162: icmp_seq=14 ttl=55 time=762.454 ms 64 bytes from 204.9.163.162: icmp_seq=15 ttl=55 time=705.879 ms 64 bytes from 204.9.163.162: icmp_seq=16 ttl=55 time=912.125 ms 64 bytes from 204.9.163.162: icmp_seq=17 ttl=55 time=723.781 ms 64 bytes from 204.9.163.162: icmp_seq=18 ttl=55 time=754.773 ms 64 bytes from 204.9.163.162: icmp_seq=19 ttl=55 time=704.012 ms 64 bytes from 204.9.163.162: icmp_seq=20 ttl=55 time=664.184 ms 64 bytes from 204.9.163.162: icmp_seq=21 ttl=55 time=733.904 ms 64 bytes from 204.9.163.162: icmp_seq=22 ttl=55 time=1108.232 ms Greg On Sep 22, 2010, at 9:39 PM, Patrick Shoemaker wrote: Check your math... Best case scenarios: c = 3e8 m/s = 3e5 km/s l = 22000 mi = 35406 km (35406 km) / (300000 km/s) = 0.118 s = 118 ms Round trip packet time due to RF delays only from ground point to ground point = 472 ms Patrick Shoemaker Vector Data Systems LLC shoemak...@vectordatasystems.com office: (301) 358-1690 x36 http://www.vectordatasystems.com <http://www.vectordatasystems.com/>
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