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Reliability and Recoverability
Issue 5 January 1998
1-19555-230-024
Critical Reliability
Critical reliability systems are fully operational over 99 percent of the time, on
average. No other switch vendor offers this level of system redundancy.
A critical reliability DEFINITY ECS includes:
■ Two control carriers
■ Two tone-clock circuit packs in each port network
■ Two connections between port networks or between Expansion Port
Networks and the Center Stage Switch
■ Two switch node carriers in center-stage systems
Figure 1-10 shows two control carriers and duplicate fiber-optic cables that con-
nect each port network in a critically reliable, directly-connected system.
Figure 1-10. Critical Reliability, Directly Connected System
1) Processor Port Network 3) Control Carrier
2) Expansion Port Network 4) Duplicate Control Carrier
5) Fiber Optic Cables