North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: T3 Latency
Yup. Dropped a letter there. 130mi/msec. .....Matthew On Sat, Feb 17, 2001 at 09:33:02AM -0500, Charles Scott wrote: > > 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
|