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Re: RTT from NY to New Delhi?

  • From: Gian Constantine
  • Date: Wed May 16 11:43:08 2007
Seems pretty damned reasonable to me considering the shortest distance between these two locations is a little less than 14,000 kilometers. Given the speed of light through glass, a convoluted fiber path, quite a few O/E - E/O conversions (EDFAs will only get you so far), and several switches, a 350ms RTT is decent.

Removing the gear and assuming an impossibly direct fiber path, would still give an RTT of about 140ms.

Gian Anthony Constantine

On May 16, 2007, at 10:59 AM, Marshall Eubanks wrote:



On May 16, 2007, at 10:35 AM, Tim Franklin wrote:


On Wed, May 16, 2007 2:20 pm, Joe Maimon wrote:

What should I expect?

I am seeing ~350 from a vendor provided mpls cloud to a site in

Sukhrali Chowk, Gurgaon, Haryana, India

Seems not-unreasonable.  I remember getting about 150ms or 250ms from
London to Gurgaon depending on whether we were on the straight-across
cable or the round-the-bottom cable.  (Sorry, both my geography and my
cable-names are hazy).

The best recent data I have is from Bangalore to Tyco Road in Virginia through VSNL and Cogent.

Here is a sample (this goes through San Jose) :

Mon Mar  5 05:26:21 EST 2007
from Bangalore through the VSNL network
--- 63.105.122.1 ping statistics ---
10 packets transmitted, 10 packets received, 0% packet loss
round-trip min/avg/max/stddev = 285.495/319.649/395.330/38.576 ms

370 ms seems a little high but not unreasonable.

Regards
Marshall Eubanks



Going east from NY, you'd add 70 or 80ms to that - and a quick look
suggests routes going west instead.  (Test from home to .IN NS goes London
-> NY -> West Coast -> Singtel -> India, for ~370ms)

It's starting to head a bit towards walkie-talkie mode for VoIP, but not
too bad other than that...

Regards,
Tim.