It automatically performs diagnostics based on the domain model, fault models, the current system state, real-time events, and events generated by the performance monitoring system. The CDG technology makes a clear distinction between the domain model (satellites, communications nodes and links, etc.) and the fault models.
With such dynamic links between the nodes, it was necessary to build a system based on a very dynamic, real-time model that could account for the up-to-date status of the links. The overall system communications are summarized in the following diagram: A flexible system was needed, that could analyze fault propagation to diagnose faults while the network structure was changing. But here, even the “backbone” was moving. Traditional management solutions all assumed a fairly fixed network, especially at its core. There was concern that fault and performance management might be too complex to even be practical. Iridium posed a severe challenge for network management, because the network is so dynamic. Calls must be handed off from satellite to satellite every 7 minutes or so. This movement is the opposite of the situation with ground-based wireless systems: in effect the base stations are moving fast and the customers are standing relatively motionless. Also, the satellite-to-satellite links break and are re-formed with different satellites as they all cross the poles in their polar orbits. That’s caused by the orbital movement of the satellites. Satellite-to-ground links shown in the diagram only last about 6-8 minutes. Or, if the person at the other end of the call is also an Iridium subscriber, that subscriber also connects through the satellite network.
From there, communication goes between other satellites and/or back to ground stations on the way to traditional phone systems. Subscribers with handheld phones communicate directly with the satellites. Iridium is a satellite-based global phone system. Iridium Global Satellite Phone System Fault Management Home About Us Products Services Examples Tech Resources Contact Us
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