TR TSY 000009 : ISSUE 1

1.0 Introduction
      1.1 Purpose
      1.2 Definitions
      1.3 Scope
2.0 Digital Multiplex Interface Requirements
      2.1 Network Compatibility Requirements
            2.1.1 Digital Hierarchy
            2.1.2 Interconnection Arrangements
            2.1.3 Interconnection Specifications
      2.2 Signal Encoding
            2.2.1 Synchronization of Inputs
      2.3 DS1 Coding
            2.3.1 DS1 Formats
            2.3.2 DS1 Zero Code Suppression
      2.4 DS1C Coding
            2.4.1 DS1C Framing
            2.4.2 DS1C Zero Code Suppression
      2.5 DS2 Coding
            2.5.1 DS2 Framing
            2.5.2 DS2 Zero Code suppression
      2.6 DS3 Coding
            2.6.1 DS3 Framing
            2.6.2 DS3 Zero Code Suppression
3.0 Digital Multiplex Feature and Function Requirements
      3.1 Information Transfer Between Digital Signal
            Levels
      3.2 Multiplexing Functions and Requirements
      3.3 Demultiplexing Functions and Requirements
      3.4 Zero Suppression Coding Functions and
            Requirements
      3.5 Monitoring and Controlling Functions and
            Requirements
      3.6 Enhanced Add/Drop Capability
      3.7 Remote Loop-back
      3.8 DM1C Multiplex Requirements
      3.9 DM12 Multiplex Requirements
      3.10 DM13 Multiplex Requirements
      3.11 DMX3 Multiplex Requirements
4.0 Digital Multiplex Operational Requirements
      4.1 Condition, Monitoring and Failure-Detection
            Thresholds
            4.1.1 Loss of Signal
            4.1.2 Out-of-Frame
            4.1.3 Bipolar Violations (BPV)
            4.1.4 Parity Errors
            4.1.5 Condition Indicator (X) Bit Changes
            4.1.6 Alarm Indication Signals (AIS)
            4.1.7 Internal Failures
            4.1.8 Control Indications
      4.2 Performance Monitoring Requirements
      4.3 Alarm-Related Actions
            4.3.1 Signal Destroyed
            4.3.2 Signal Impaired
            4.3.3 DS1C and DS2 X Bit Changes
            4.3.4 Alarm Indication Signals (AIS)
      4.4 Trouble Indications
            4.4.1 Condition Designations (Also see TA-TSY-
                    000047)
            4.4.2 Local Indications
            4.4.3 Central Office Audible/Visual Indications
            4.4.4 Centralized Trouble Indications and
                    Remote Controls
            4.4.5 Trouble Indications for Multiplex Used
                    In The Distribution Plant
      4.5 Availability and Protection Switching
      4.6 Jitter
            4.6.1 Jitter Accommodation (Tolerance)
            4.6.2 Jitter Generation
            4.6.3 Jitter Transfer (Attenuation)
5.0 Digital Multiplex General Requirements
      5.1 Multiplexers Designed for Central Office
            Application - Physical Environmental Requirements
            5.1.1 Spatial Requirements
            5.1.2 Hardware and Craft Interface Requirements
            5.1.3 Environmental Requirements
            5.1.4 Electrical Requirements
      5.2 Multiplexes Designed for Distribution Plant
            Application - Physical and Environmental
            Requirements
      5.3 Quality and Reliability
            5.3.1 Reliability Objectives
            5.3.2 Reliability Predictions
            5.3.3 Device Reliability
            5.3.4 Physical Design
            5.3.5 Software Quality
            5.3.6 Manufacturing Quality Program
            5.3.7 Customer Verification of Quality and
                    Reliability
            5.3.8 Product Support
      5.4 Documentation and Training Requirements
            5.4.1 Documentation Standards
            5.4.2 Documentation Required
      5.5 Space Planning Documentation
      5.6 Training
6.0 Glossary
7.0 Reference List