1 Introduction
1.1 Purpose
1.2 Changes from Issue 2 of TR-TSY-000397
1.3 Features Implemented by These Requirements
1.4 ISDN Reference Configurations & Interface
              Standards
1.5 Relationship of This TR To ISDN Interface
              Standards
1.6 Document Organization
1.7 Key Related Bellcore Documents
1.8 Requirements Definitions and Conventions
2 Transport System Overview
2.1 Service Capabilities
2.2 Interface at the U Reference Point
2.3 Transport Architectures
2.4 Overview of Functional Requirements
2.5 Operations System Communications With
              Transport Network Elements
2.6 Digital Subscriber Line (DSL) Transport
2.7 T Interface ``Line Unit' Functionality
2.8 Carrier System Transport
2.9 Generic Interfaces Between Switching and
              Transport Systems
2.10 ISDN Basic Access Maintenance
2.11 Application of ISDN Transport Technology to
              Universal Digital Channel Systems
2.12 Line Unit Function Requirements Summary &
              Preview
3 Requirements for LT ``Line Units'
3.1 ``Line Unit' Interfaces
3.2 DSL Frame Structure and Bit Assignment
3.3 LT-NT1 DSL Transport System Performance
3.4 DSL Embedded Operations Channel (eoc)
3.5 Performance Monitoring and Alarm Conditions
3.6 Out-of Service LT Testing Features
3.7 LT DSL Synchronization With the Network
3.8 Sealing Current Provisioning
3.9 DSL Start-Up
4 Requirements For LT-like ``Line Units' (LULT)
4.1 ``Line Unit' Interfaces
4.2 LULT DSL Master Transceiver Function
4.3 Multiplexed ISDN Basic Access and Operations
              Communication
4.4 DSL Embedded Operations Channel (eoc) and the
              LULT
4.5 DSL Overhead Indicator Bit Functions
4.6 LULT-NT1 DSL Transport System Performance
4.7 LULT In-Service Performance Monitoring
              Requirements
4.8 Out-of-Service LULT Testing Features
4.9 LULT DSL Synchronization With the Network
4.10 Sealing Current Provisioning
4.11 LULT Startup Mode
5 Requirements For Standalone NT1s
5.1 Standalone NT1 Interfaces
5.2 DSL Frame Structure
5.3 DSL Transport System Performance
5.4 Embedded Operations Channel (eoc)
5.5 Performance Monitoring
5.6 Out-of-Service NT1 Testing Features
5.7 DSL Overhead Indicator Bits
5.8 NT1 DSL Synchronization With the Network
5.9 NT1 Maintenance Modes
5.10 NT1 Powering
6 Requirements For NT1-like ``Line Units' (LUNT)
6.1 Line Unit Interfaces
6.2 LUNT DSL Slave Transceiver Function
6.3 Multiplexed ISDN Basic Access & Operations
              Communications
6.4 DSL Embedded Operations Channel (eoc) & the LUNT
6.5 DSL Overhead Indicator Bit Functions
6.6 LT-LUNT DSL Transport System Performance
6.7 LUNT In-Service Performance Monitoring
              Requirements
6.8 Out-of Service LUNT Testing Features
6.9 LUNT DSL Synchronization with the Network
6.10 LUNT DSL Activation and Deactivation
7 DSL Embedded Operations Channel (eoc) Requirements
8 Requirements For T Interface Line Units (LUTI)
8.1 Line Unit Interfaces
8.2 Maintenance Features
8.3 Operations Communication
8.4 LUTI Synchronization With the Network
9 Carrier System And ISDN Switch Functional
              Requirements
9.1 Basic Access Multiplexing Methods
9.2 Time Slot Sequence Integrity
9.3 Clear Channel Capability
9.4 Transmission Performance
9.5 Operations Systems Communication With DSLs
9.6 Performance Monitoring of Carrier Systems
9.7 Synchronization of Carrier Systems With the Network
10 Interfaces For Multiplexing Basic Access On DS1 &
              Higher Rate Facilities
10.1 ``4 D Channels to 1 DS0' Time Division
              Multiplexing (``4:1' TDM) Interface
10.2 3-DS0 Time Division Multiplexing (3-DS0 TDM)
              Interface
10.3 Start-on-Command Only Procedure for Architectures
              Using Tandem DSLs
11 Requirements For Universal Digital Channel Systems
11.1 DSL Requirements
11.2 Carrier System Requirements
12 Out-of-service System Testing Features
12.1 Bellcore Recommended Out-of-Service ISDN BRA
              Line Testing Features
12.2 Support of Current Test Systems for ISDN BRA
              Transported Via UDLC
13 Miscellaneous Common Requirements
13.1 Physical Requirements
13.2 Environmental Requirements
13.3 Electrical Safety
13.4 Quality and Reliability
13.5 System Administration
14 Acronyms
References