High Availability. For their critical services, BMOs need highly reliable systems based on high availability services. The Target Service Availability figure of the SLA needs to be used carefully and must often be complemented by additional measures to ensure the required level. See §4.2 “Service Availability”. In the set up of such a service, clearly defined tests must be carried to verify performance and stability over time and under worst case traffic scenarios. Monitoring and measurement during transmission is also essential to quickly identify a deterioration of performance, so as to prevent an eventual failure. That is why a proactive provider’s Network Operating Centre (NOC) is very important to BMOs. Reaction procedures and protection mechanisms must be specified precisely in addition to target availability. Fast repair time is needed in case of failure and it must be specified in SLAs too.
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