Re: ATM (was Re: too many routes)

[Nathan Stratton <nathan () netrail net>]

On Thu, 11 Sep 1997, Vadim Antonov wrote:

> Quote from Jim Steinhardt's <jsteinha () 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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