GR 1244 CORE : ISSUE 4

Preface
1 Introduction
  1.1 General
  1.2 Reasons for Reissue
  1.3 Requirements Terminology
  1.4 Requirement Labeling Conventions
      1.4.1 Numbering of Requirement and Related Objects
      1.4.2 Requirement, Conditional Requirement, and
            Objective Object Identification
2 General Clock Concepts
  2.1 Application
  2.2 Environment
  2.3 Interfaces
  2.4 Stratum Hierarchy
  2.5 Synchronization Reference Transport
  2.6 Performance Measurement Parameters and Units
      2.6.1 Slips
      2.6.2 Unit Interval (UI)
      2.6.3 Jitter
      2.6.4 Wander
      2.6.5 Time Delay, Phase-Time or Phase
      2.6.6 Frequency Accuracy
      2.6.7 Frequency Stability
  2.7 Test Measurement Parameters
      2.7.1 Time Interval Error (TIE)
      2.7.2 Maximum Time Interval Error (MTIE)
      2.7.3 Time Deviation (TDEV)
      2.7.4 Time Variance (TVAR)
      2.7.5 Test Methodology
3 General Functional Requirements
  3.1 Clock Stratum Level
  3.2 NE Timing Modes
      3.2.1 External-Timing
      3.2.2 Physical Interface to Synchronization Network
      3.2.3 Line-Timing
      3.2.4 Loop-Timing
      3.2.5 Through-Timing
  3.3 Duplication of Equipment
  3.4 Timing Reference Switching
      3.4.1 Timing Reference Failure Conditions
      3.4.2 Performance During Reference Switching
      3.4.3 Revertive and Nonrevertive Switching
  3.5 Synchronization Pull-In/Hold-In Range
  3.6 Switching Between Clock Modes
  3.7 Transition From Holdover to Normal Mode
4 Input Tolerance Requirements
  4.1 Signal Interruptions
  4.2 Jitter Tolerance
  4.3 Wander Tolerance
  4.4 Phase Transient Tolerance
5 Output Signal Requirements
  5.1 Free Run Frequency Accuracy
  5.2 Holdover Frequency Stability
  5.3 Wander Generation
  5.4 Wander Transfer
  5.5 Jitter Generation and Transfer
  5.6 Phase Transients
  5.7 Phase Build-Out
6 Additional Synchronization Requirements Related
  To DSO Interconnections
  6.1 Phase Alignment Requirements
  6.2 Composite Clock (CC) Redundancy Requirements
  6.3 CC Robustness Requirements
      6.3.1 CC Phase Hits
      6.3.2 CC LOS
7 Requirements For Primary Reference Sources
8 Alarms, Reports & Control Commands
  8.1 Alarms
      8.1.1 Minor Alarms
      8.1.2 Major Alarms
      8.1.3 Critical Alarms
      8.1.4 Alarm Escalation
  8.2 Non-Alarmed Conditions
  8.3 Data Retention
  8.4 Controls
  8.5 Status Indicators
      8.5.1 In Service Indicators
      8.5.2 Alarm Status Indicators
9 Other Generic Criteria
  9.1 Physical and Environmental Criteria
      9.1.1 Central Office and CEV Equipment
      9.1.2 Outside Plant Environment
  9.2 Documentation and Training
Appendix A - Requirement-Object List
References
Acronyms
Requirement - Object Index

Specifies criteria that apply to the various clocks deployed in telecommunications equipment such as transport Network Elements (NEs), Digital Switches, and Timing Signal Generators (TSGs).