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Introduction
555-230-024
1-16 Issue 5 January 1998
■ DEFINITY’s universal hardware and flexible software allow systems to be
reconfigured quickly in emergency situations. Port networks can be
added and network routing can be changed in a matter of minutes.
Based on the needs of your organization, three redundancy configurations are
available:
■ Standard Reliability
■ High Reliability
■ Critical Reliability
Standard Reliability
The built-in duplication of many of its parts makes the system inherently reliable.
In addition to the dual bus, the system includes:
■ One control carrier
■ One tone-clock circuit pack per port network
■ Port networks interconnected by single fiber cables
High Reliability
High reliability systems include the following:
■ Two control carriers (located in the Processor Port Network cabinet),
which contain duplicate processor and tone-clock circuit packs (one is
active and the other is in standby)
■ One tone-clock circuit pack per Expansion Port Network
■ Duplicate connections between the Center Stage Switch and the
Processor Port Network
■ Expansion port networks connected by single fiber cables
■ Duplicate switch node clock circuit packs (one is active and the other is in
standby) in each switch node carrier
Figure 1-8 shows a high reliability, directly connected system.