[attachment=6226]

Satellite Internet access

Latency is the delay between requesting data and the receipt of a response, or in the case of one-way communication, between the actual moment of a signal's broadcast and the time received at its destination. Compared to ground-based communication, all geostationary satellite communications experience high latency due to the signal having to travel 35,786 km (22,236 mi) to a satellite in geostationary orbit and back to Earth again. Even at the speed of light (about 300,000 km/second or 186,000 miles per second), this delay can be significant. If all other signaling delays could be eliminated it still takes a radio signal about 250 milliseconds, or about a quarter of a second, to travel to the satellite and back to the ground. For an internet packet, that delay is doubled before a reply is received. That is the theoretical minimum. Factoring in other normal delays from network sources gives a typical one-way connection latency of 500–700 ms from the user to the ISP, or about 1,000–1,400 milliseconds latency for the total Round Trip Time (RTT) back to the user. This is far worse than most dial-up modem users' experience, at typically only 150–200 ms total latency.
This latency makes Satellite Internet service essentially unusable for applications requiring real-time user input, such as online games or remote surgery. This delay can also be irritating with interactive applications, such as VoIP, videoconferencing, or other person to person communication. The functionality of live interactive access to a distant computer can also be subject to the problems caused by high latency. However these problems are more than tolerable for basic email access and web browsing, and in most cases are barely noticeable
for more ::->
http://en.wikipediawiki/Online_game

---