CONTENTS

 1     General
 2     General design objectives
        2.1     Exchange modifications and growth
        2.2     Service provisioning and records
        2.3     Translations and routing information
        2.4     Resource utilization
        2.5     Physical design objectives
 3     Integrated Digital Network design objectives
        3.1     Exchange timing distribution
        3.2     Network synchronization
        3.3     Slip  
        3.5     Synchronization requirements when interworking with a digital satellite system
 4     Availability design objectives
        4.1     General
        4.2     Causes of unavailability
        4.3     Intrinsic and operational unavailability
        4.4     Planned outages
        4.5     Total and partial unavailability
        4.6     Statistical basis
        4.7     Relevant failure events
        4.8     Availability independence
        4.9     Intrinsic downtime and unavailability objectives
       4.10     Operational unavailability objectives
       4.11     Initial exchange availability performance
 5     Hardware reliability design objectives