With convergence of voice and data on next-generation networks, service providers must still provide quality of service comparable to today's Public Switched Telephone Network. To meet this QoS challenge, communications equipment manufacturers (TEMs) are migrating to open architecture hardware and software building blocks sourced from multiple vendors. This paper surveys options for a Linux-based open architecture for High Availability, to support TEMs in defining and integrating OS platforms to meet their goal of 5- and 6-nines availability targets without resorting to proprietary hardware or system software components.
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