Some individuals choose to maintain a satellite phone as part of their disaster preparedness kit. An earthquake, hurricane, terrorist attack, or many other things can disrupt each normal landline phone and wireless cellular telephone service. But - in principle - satellite mobile phone service should be capable to survive all such disasters, because the satellites are safely distant, somewhere way up inside the sky.
Nevertheless, satellite telephone assistance also has an Achilles Heel. That could be the point at which a phone call is routed through the satellite that received your signal for the ultimate person you're calling. Within the case of most solutions, your contact is routed from the satellite and immediately to its closest ground station, after which it goes in the ground station, as best it can, to its final destination. If its final desired destination is one more satellite phone, it travels back up to a different satellite and down for the phone, wherever it may possibly be.
This means, for most satellite phone services, there remain ground based vulnerabilities. On the other hand, Iridium could be the notable exception to this. If you are calling to another Iridium cellular phone, your contact goes directly from your telephone towards the closest accessible satellite , then is routed amongst the satellites until reaching a satellite that can then beam the phone down for the recipient.
This capability makes Iridium probably the most robust network for handling ground based disasters.
In principle just one Iridium satellite can handle up to about 1100 calls simultaneously, as well as the total Iridium network something less than 66 times this number. These aren't extremely large numbers, but neither is the complete installed based of Iridium users extremely big, so 1 would anticipate that, in some type of regional emergency, the Iridium network could handle its users' wants without having appreciable congestion.
A good instance of this was with Hurricane Katrina. The hurricane knocked out over 3 million landline circuits and more than 1000 cellular sites. Three weeks later, only 60% with the cellular phone networks were operational and two million calls were still failing. Conversely, Iridium's system was completely unaffected, and for the initial 72 hours of Katrina, Iridium visitors in the Gulf region elevated much more than 3000%. The amount of subscribers in affected areas grew 500%.
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