According to cisco design guidelines[1] , 150 msec is acceptable network latency(not including video encoding/decoding). Also [2] talks about 300 msec total lat

According to cisco design guidelines[1] , 150 msec is acceptable network latency(not including video encoding/decoding). Also [2] talks about 300 msec total latency about the limits for remote surgeries. Even if we take 150 as our guiding figure, if we assume direct fiber optic connection between sites, the maximum distance would be 45000 kilometers, which can basically connect any 2 points on earth. So theoretically at least, it's possible. Achieving good latencies in real life is much harder though :) [1]http://www.cisco.com/en/US/docs/solutions/Enterprise/Video/telepresenceaag.html http://www.cisco.com/en/US/docs/solutions/Enterprise/Video/t...