TR NWT 000496 : ISSUE 3

1 Introduction
    1.1 Scope
    1.2 Definitions
          1.2.1 Add-Drop Multiplexes
          1.2.2 SONET
          1.2.3 Criteria
    1.3 Organizations
    1.4 Relation to TR-NWT-000253
    1.5 Updating
    1.6 Change History
2 Functions and Applications
    2.1 Functions
    2.2 Applications
3 Network Compatibility Criteria
    3.1 Interfaces
          3.1.1 DSn Electrical Signal
          3.1.2 OC-N/M Optical Signal
          3.1.3 STS Electrical Signal
          3.1.4 DS1 Formats
          3.1.5 SONET Format
    3.2 Transmission Criteria
          3.2.1 Synchronization (SONET ADM Clock
                  Applications)
          3.2.2 Synchronization Criteria
                  3.2.2.1 Timing Mode Requirements
                  3.2.2.2 Internal Clock Requirements
                  3.2.2.3 Timing Distribution Requirements
          3.2.3 Jitter
          3.2.4 Framing Requirements
          3.2.5 Pointer Processing
                  3.2.5.1 STS-1 Payload Pointer
                  3.2.5.2 VT Payload Pointer
          3.2.6 Transmission Path
                  3.2.6.1 Bit and Signaling Integrity
                  3.2.6.2 STS-1 Frame Alignment
                  3.2.6.3 Transmission Delay
                  3.2.6.4 Signaling Delay
                  3.2.6.5 Signaling Distortion
    3.3 SONET Transmission Modes
          3.3.1 STS Level Services
          3.3.2 Sub-STS-1 Level Services
                  3.3.2.1 Sub-STS-1 Asynchronous Mappings
                  3.3.2.2 Sub-STS-1 Byte-Synchronous
                            Mappings
          3.3.3 Unequipped Channel Patterns
          3.3.4 Channel Assignment
          3.3.5 Cross-Connect Options
    3.4 SONET ADM Facility Maintenance Criteria
4 Feature Listing
    4.1 Required Features
    4.2 Optional Features
5 Feature Description
    5.1 Required Features
          5.1.1 DSn Electrical Low-Speed Clear Channel
                  Interface
          5.1.2 OC-N High-Speed Fiber Interface
          5.1.3 DSn/OC-N Multiplexing
          5.1.4 DSn Add-Drop Capability
          5.1.5 Operations Interfaces
          5.1.6 Local Nonvolatile Memory Backup
          5.1.7 Operations Interface Security
          5.1.8 SONET ADM Frame Maintenance
          5.1.9 SONET ADM Facility Maintenance
                  5.1.9.1 DSn Clear Channel Interfaces
                  5.1.9.2 SONET Interfaces
                  5.1.9.3 VT-Path Maintenance Monitoring
    5.2 Optional Features
          5.2.1 OC-M/STS-M Low-Speed Interface (VT Add-Drop)
          5.2.2 OC-M/STS-M Low-Speed Interface (STS-1
                  Add-Drop)
          5.2.3 DS1(24 DS0)OC-N Multiplexing (Vt1.5 Byte-
                  Synchronous Mappings)
          5.2.4 Terminated DS3 SYNTRAN Low-Speed Interface
          5.2.5 Terminated DS3 (28 DS1) Asynchronous
                  Low-Speed Interface
          5.2.6 DS3 Asynchronous to SYNTRAN Refonnat
          5.2.7 Programmability
          5.2.8 Drop-and-Continue Feature
          5.2.9 Multiple OC-N High-Speed Fiber Interfaces
          5.2.10 Access and Test
          5.2.11 Ring Capabilities
          5.2.12 SONET Automatic Protection Switching
          5.2.13 Locked Mode of Operation
          5.2.14 In-Service Rolling
6 Other Generic System Criteria
    6.1 System Availability Criteria
    6.2 Other Quality and Reliability Requirements
7 Criteria for Loop Applications
    7.1 Required Features
8 Acronyms
9 References
10 Appendix A. Summary of SONET ADM Generic Criteria

Bellcore's view of network compatibility generic requirements and the functions and features of SONET ADMs required for use in interoffice and distribution networks, with an aim to help promote compatibility among SONET ADM (or functional equivalent), that will add and drop a variety of digital signals from a SONET OC N signal, is presented in this TR. The digital signal interface to SONET ADM can accommodate either synchronous or asynchronous signals. The SONET ADM may also multiplex between the OC N and SONET OC M signal as an optional feature. This document also describes a version of the SONET ADM that generates a SONET OC N signal from up to Nx (28DSI) or equivalent signals, referred to as the "terminal" configuration. The requirements in this TR (unless noted otherwise) apply to both version of SONETADM