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Jul 24th, 2009 at 12:20pm
I am a bit puzzled by your figures "256 Mbit/s up and 128 down"
Normally for mixed internet access and VoIP purposes the downlink is larger than the uplink. Also, a typical small ISP might have a satellite link capacity more like 750 kbit/s down and 256 kbit/s up and perhaps 75 customer PCs.
These figures can be scaled for any number of customers on the basis of 10kbit/s down/ 3kbit/s up per PC or 12kbit/s up & down per VoIP phone.
Satellite costs are approx $2500 - $7000 per month per Mbit/s.
For 7500 customers I estimate that you need about 75 Mbit/s download and 25 Mbit/s upload, and this would need almost two satellite transponders (one each way).
That is feasible, provided there is sufficient spare capacity available.
To obtain capacities like 1 Gbit/s to 10 Gbit/s you need to help in the planning process for future new satellites. Think in terms of participating in a new Ka band satellite where there might be enough bandwidth.
Best regards, Eric.
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