[34717] in North American Network Operators' Group
Re: T3 Latency
daemon@ATHENA.MIT.EDU (Charles Scott)
Sat Feb 17 09:35:48 2001
Date: Sat, 17 Feb 2001 09:33:02 -0500 (EST)
From: Charles Scott <cscott@gaslightmedia.com>
To: "Matthew F. Ringel" <ringel@akamai.com>
Cc: nanog@merit.edu
In-Reply-To: <20010217075056.A15283@crabcake.kendall.akamai.com>
Message-ID: <Pine.LNX.4.21.0102170930500.13454-100000@harbor.gaslightmedia.com>
MIME-Version: 1.0
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Errors-To: owner-nanog-outgoing@merit.edu
Matthew:
Appears to be a typo in your final number of 130 mi/sec, but I get where
you're going with this. I'm just having a problem trying to figure out how
I end up with a couple thousand fiber miles from Northern Michigan to
Chicago. Should be interesting to sort this one out.
Thanks,
Chuck
On Sat, 17 Feb 2001, Matthew F. Ringel wrote:
>
> The rule of thumb I use is that the speed of light in fiber-optic cable is
> roughly 2x10^8 m/sec.
>
> 2x10^8 m/sec = 200,000,000 m/sec = 200,000 km/sec = 200 km/msec =~ 130 mi/sec
>
> I once worked with a customer whose first hop out was ~30ms, regardless of the
> load on the line (a t3, iirc). Sure enough, he was on a very large SONET ring
> that travelled the north-south length of the US roughly twice before his
> traffic went elsewhere.
>
> ......Matthew
