ATM (was Re: too many routes)
Nathan Stratton
nathan at netrail.net
Fri Sep 12 09:19:39 UTC 1997
On Thu, 11 Sep 1997, Vadim Antonov wrote:
> Quote from Jim Steinhardt's <jsteinha at cisco.com>
> personal message:
>
> >>a) light is slower in dense media
>
> > The index of refraction of glass is 1.5 vs 1.0 for
> > a vacuum. Hence, the speed of light in glass is 2 * 10 **8 m/s.
>
> That gives 60 ms RTT on 4000 mile line.
>
> Case closed.
Yep, but you also need to add a few ms for electronics in that 4000 mile
line. We tend to see around 64 - 65 ms delay between our DCA and PAL
routers.
rt1.DCA.netrail.net# ping rt1.PAL
ICMP ECHO rt1.PAL.netrail.net (205.215.45.33): 56 data bytes
64 bytes from 205.215.45.33: icmp_seq=0 ttl=255 time=65.764 ms
64 bytes from 205.215.45.33: icmp_seq=1 ttl=255 time=64.851 ms
64 bytes from 205.215.45.33: icmp_seq=2 ttl=255 time=65.053 ms
64 bytes from 205.215.45.33: icmp_seq=3 ttl=255 time=64.994 ms
^C
--- rt1.PAL.netrail.net ICMP ECHO statistics ---
4 packets transmitted, 4 packets received, 0% packet loss
round-trip min/avg/max = 64.851/65.160/65.764 ms
rt1.DCA.netrail.net#
Nathan Stratton President, CTO, NetRail,Inc.
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Phone (888)NetRail NetRail, Inc.
Fax (404)522-1939 230 Peachtree Suite 500
WWW http://www.netrail.net/ Atlanta, GA 30303
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