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 networ ks can be
added and network routing can be changed in a matter of minutes.
Based on the needs of your organization, three redundanc y 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 pack s (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.