Lucent Technologies 555-230-024 User Manual

Introduction

555-230-024

Issue 5    January 1998 

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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:

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Standard Reliability

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High Reliability

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Critical Reliability

The built-in duplication of many of its parts makes the system inherently reliable. 
In addition to the dual bus, the system includes:

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One control carrier

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One tone-clock circuit pack per port network

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Port networks interconnected by single fiber cables

High reliability systems include the following:

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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)

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One tone-clock circuit pack per Expansion Port Network

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Duplicate connections between the Center Stage Switch and the 
Processor Port Network

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Expansion port networks connected by single fiber cables

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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.