Lucent Technologies 555-230-024 Manuale Utente
Reliability and Recoverability
Issue 5 January 1998
1-19
555-230-024
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.
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
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.
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