GR 2856 CORE : ISSUE 2

Preface
1 Introduction
    1.1 Purpose and Scope
    1.2 Background
    1.3 Terminal Assumptions
    1.4 Requirement Terminology
    1.5 Requirement Labeling Conventions
          1.5.1 Numbering of Requirement and Related
                  Objects
          1.5.2 Requirement, Conditional Requirement, and
                  Objective Object Identification
2 General Information
    2.1 High-Level Feature Description
    2.2 User Perspective
3 Feature Requirements
    3.1 Feature Operations
          3.1.1 Main Feature Operations
                  3.1.1.1 Monitoring of D-Channel Messages -
                           Terminal Level
                  3.1.1.2 Monitoring of D-Channel Messages -
                           Interface Level
                  3.1.1.3 Monitoring of D-Channel Messages -
                           Common Resource Level
                  3.1.1.4 D-Channel Messaging Limit
                           Parameters - Terminal Level
                  3.1.1.5 D-channel Messaging Limit
                           Parameters - Interface Level
                  3.1.1.6 D-Channel Messaging Limit Parameters -
                           Common Resource Level
                  3.1.1.7 Summary of Messaging Limits for
                           Terminals, Interfaces and Common
                           Resources
                  3.1.1.8 Effect of Measurement Interval on
                           Messaging Limits
                  3.1.1.9 Near-Overload Condition- BRI
                           Terminals and PRIs
                  3.1.1.10 Overload Condition - BRI Terminals
                           and PRIs
                  3.1.1.11 Out of Service Condition - BRI
                           Terminals and PRIs
                  3.1.1.12 In-Service Condition - BRI Terminals
                           and PRIs
                  3.1.1.13 Permanent Out-of-Service
                           Condition - BRI Terminals and PRIs
                  3.1.1.14 Overload Condition - Common
                           Resource Level
                  3.1.1.15 No-Overload Condition - Common
                           Resource Level
          3.1.2 Other Feature Operations
                  3.1.2.1 BRI Display for Near-Overload
                           Condition
                  3.1.2.2 BRI Display for Overload/Out-of
                           Service Condition
                  3.1.2.3 BRI Display for In-Service Condition
          3.1.3 Error Treatment and Abnormal Events
    3.2 Internal Call-Processing Controls
    3.3 Signaling/Message Structure
          3.3.1 ASN.1-Encoded Notification Indicator
                  Values
    3.4 Administration/Operations
          3.4.1 Memory Administration (Service Charges/
                  Subscription Parameters)
                  3.4.1.1 D-channel Messaging Limit
                           Parameters - BRI Terminal Level
                  3.4.1.2 D-Channel Messaging Limit
                           Parameters - PRI Level
                  3.4.1.3 D-Channel Messaging Limit
                           Parameters - Common Resource Level
          3.4.2 Network Maintenance
                  3.4.2.1 Surveillance
                  3.4.2.2 Testing
          3.4.3 Network Data Collection (NDC)
          3.4.4 Network Traffic Management (NTM)
                  3.4.4.1 BRI-Terminal-Related Periodic
                           Measurements
                  3.4.4.2 PRI-Related Periodic Measurements
                  3.4.4.3 Common-Resource-Related
                           Periodic Measurements
                  3.4.4.4 Per-BRI-Terminal Special Study
                           Measurements
                  3.4.4.5 Per-PRI Special Study Measurements
                  3.4.4.6 Per-Common-Resource Special
                           Study Measurements
          3.4.5 Billing and Comptroller
          3.4.6 Switching System Workstation and OS/NE
                  Interface Messages for BRI/PRI "Out-of
                  Service" and "In-Service" conditions
          3.4.7 Switching System Workstation and OS/NE
                  Interface Messages for "Common Resources
                  Overload" Conditions
          3.4.8 Per-BRI-Terminal and Per-PRI State Changes
                  for "Out-of-Service" and "In-Service"
                  Conditions
          3.4.9 Per-Common Resource State Changes for
                  "Overload" and "No-Overload" Conditions
    3.5 Interactions
          3.5.1 Essential Lines
          3.5.2 Network-Determined Busy (NDB) Conditions
                  for BRI Terminals
          3.5.3 EKTS
          3.5.4 Network-Determined Busy (NDB) Conditions
                  for BRI Terminals
    3.6 Limitations and Restrictions
    3.7 Timing and Tolerances
Appendix A: Data Dictionary for D-Channel Message Performance
Monitoring and Control
    A.1 Scope and Definition
    A.2 Allowed Data Values
    A.3 ISDN Switch Data Dictionary
References
Glossary
Requirement-Object List
Requirement-Object Index

Presents Bellcore's view of proposed generic requirements for monitoring and controlling the volume of D-channel messages on individual interfaces and common resources for preventing the overloading of a switching system. The requirements provide for D-channel messages to notify CPE of switching system congestion. It is expected that sophisticated CPE will react to these messages and be able to reduce their calling demands until notified that congestion no longer exists. If an overload does occur, the proposed requirements are intended to provide a systematic approach to reducing the overload and minimizing its impact on customers.