Transoceanic undersea cables handle most telecom traffic (including internet) between the various continents. There are hundreds, of not thousands of these links. Satellite is rarely used for telecom, for previously mentioned reasons. Jim
_____ From: Reza - Asterisk Enthusiast [mailto:[EMAIL PROTECTED] Sent: July 9, 2006 1:30 AM To: TAUG Subject: [on-asterisk] Satellite Internet - Wireless Inter-Continental / Inter-Country Internet There were posts with regards to satellite internet earlier. I've been looking into this more deeply, and I found an interesting article with regards to signal latency on a satellite internet access. This information below will give you an exact understanding on how a VOIP connection would work, keeping the latency in mind. So after reading this, I refuse to accept that satellite internet (pointing your dish to the southern sky) is the only means of internet access for two end points, thousands of miles away. I'd like to get an understanding on how we are actually connected to someone in Europe, Africa, or even New Zealand... via the internet... that is... when I am talking to a relative in New Zealand, the latency between us is less than 50ms. How are the internet backbones connected between my Canadian high speed provider, and the New Zealand high speed provider? Surely not through cable !!! And surely not through traditional satellite, as it would give about a 1000ms latency!!! Is there a powerful enough antenna/dish-antenna, off the shelf hardware (not in the hundreds of thousands of dollars), that can be connected between two end points, lets say 5000 KM away, and be connected at a minimum of 10 Mbps ??? If anyone can shed some light into this for my curiosity, that would be really great! Cheers! Reza. _____ HYPERLINK "http://www.dbsinstall.com/GeneralInfo/dishSatelliteInternet.asp"http://www. dbsinstall.com/GeneralInfo/dishSatelliteInternet.asp How does a Satellite Internet Connection Work? A satellite internet modem connects your computer to a Network Operations Center (NOC). The NOC is your gateway to the WWW. When your browser request a web page, the request is up to a satellite 22,3000 miles above the equator. The satellite retransmit the request down to the NOC. The NOC uses high speed internet connections to contact the web server. The server sends the requested data to the NOC, where the NOC sends the data to the satellite and down to your satellite modem. A satellite signal traveling 22,300 miles up and down and then back up and back down takes about 480 milliseconds. This is called signal latency. When you add up the satellite signal latency to the normal signal latency between the NOC and the WWW, you will have an average overall latency (in internet terms this called ping times) of at least 600ms and common ping times up to 1000ms (1 second). This compares to 100ms to 250ms for other, non-satellite, broadband methods. As long as a user understand that satellite internet will appear to have slower page loads then other broadband options of the same download speeds, most users accept this as normal. Latency does not have an appreciable affect on file transfers. -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.394 / Virus Database: 268.9.10/383 - Release Date: 07/07/2006 -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.394 / Virus Database: 268.9.10/383 - Release Date: 07/07/2006
