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Re: T3 Latency

  • From: Charles Scott
  • Date: Sat Feb 17 09:38:01 2001


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






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