Download Analysis Without Anguish: Version 12.0 For Windows by Sheridan J. Coakes PDF

By Sheridan J. Coakes

ISBN-10: 0470807369

ISBN-13: 9780470807361

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Some companies offer processing capabilities for both ordinary and disaster recovery needs. 6. ╇ A hot standby network element has its software installed and its data has been kept in synch with its mate and thus should quickly be able to assume service once its active mate has failed and disaster recovery has been activated. A hot standby network element can also be either automatically triggered into service or manually activated. • Warm Standby:╇ A warm standby network element generally has its software installed but will need data updates before it can assume service for a failed network element as part of disaster recovery.

Thus, service reliability metrics often exclude periods when the system is deemed to be unavailable/down. 2. ╇ The networking facilities and infrastructure that transport packets between the user and network elements implementing the system service must be available to connect users to applications. ╇ The system offering the service or application must be available to serve users. ╇ The probability that a session oriented service will correctly accept a valid session request and deliver acceptable service is dependent upon the application’s availability and reliability.

Partial outage definitions are often both elaborate and precise. 7), covering “Equipment that provides IP based multimedia services” like multimedia instant messaging systems: • Loss of more than 5% of the IP-based multimedia services Loss of stable service sessions • Total loss of one or more but not all services • System congestion which impacts greater than 5% of all session set-up attempts • 85% or more of the service subscribers experience a session delay of 3 seconds or greater for a period longer than 30 seconds • Interface switchovers lasting longer than 60 milliseconds • Total loss of one or more operations, administration and maintenance (OA&M) functions (default weight is 5%) • Total loss of visibility from Element Management System (default weight is 10%) • In contrast, the TL 9000 total outage definition for applications servers is very simple: Total loss of ability to provide IP-based multimedia services.

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Analysis Without Anguish: Version 12.0 For Windows by Sheridan J. Coakes


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