At its most reliable, a packet-switched telephone system can provide far more than a traditional circuit-switched network in terms of functionality and flexibility. However, while packet-switched telephony can more than match the circuit-based network in terms of functionality and flexibility, it has not yet achieved the level of reliability enjoyed by copper wire.
Hence the issue of High Availability, where a platform must, in effect, work even when it is not working. For example, a CPU might fail for some reason, but its function would be immediately taken up and carried out by a standby CPU. The platform as a whole would not miss a beat while this takes place.
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