TR NWT 000057 : ISSUE 2

1 Introduction
1.1 Purpose and Scope of Document
1.2 Organization of Document
1.3 Key Bellcore Documents
1.4 Criteria Classifications
1.5 Reasons For Change
2 DLC System Application
2.1 DLC System Deployment Planning
2.2 Carrier Serving Areas
2.3 DLC System Interfaces
3 Service Requirements
3.1 Locally-Switched Services
3.2 Non-Locally-Switched Services
3.3 Non-Switched Services
3.4 Integrated Services Digital Network (ISDN)
4 Services Transmission and Supervision Criteria
4.1 Single-Party Message Telephone Service (MTS)
4.2 Two-Party Message Telephone Service
4.3 Four-Party Message Telephone Service
4.4 Multiparty Coded Ringing Message Telephone Service
4.5 Dial-Tone-First Coin Telephone Service
4.6 Coin-First Coin Telephone Service
4.7 Locally-Switched Special Services
4.8 Universal Voice Grade (UVG) Line Units
4.9 Locally-Switched Loop-Start Supervision with
              Line Side Answer Supervision
4.10 Locally-Switched Ground-Start Supervision
              with Line Side Answer Supervision
4.11 FX Line Services
4.12 FX Line Services with Line Side Answer Supervision
4.13 FX Trunk Services
4.14 FX Trunk Services with Line Side Answer Supervision
4.15 FX Direct-Inward-Dialing Trunk Services
4.16 PBX Off-Premises Station Line Services
4.17 PBX Tie Trunk Services
4.18 Four-Wire Private Line Data Services
4.19 Voice Private Line Services - Two-Point
4.20 Voice Private Line Service - Multi-Point
4.21 Voiceband Alarm Services - Multi-Point
4.22 Digital Data Services - 2.4, 4.8, 9.6, and 56
4.23 ISDN Basic Access Service
4.24 Alarm And Low Speed Signaling Services
5 Signaling and Supervision Criteria
5.1 Locally-Switched Loop-Start Signaling
5.2 Locally-Switched Ground-Start Signaling
5.3 General Locally-Switched Loop Supervision Criteria
5.4 DLC System Ringing Criteria
5.5 Locally-Switched Loop Reverse Battery Signaling
5.6 Dial-Tone-First Coin Telephone Signaling
5.7 Coin-First Coin Telephone Signaling
5.8 Type I E&M Signaling Interface, Connecting
              Equipment Originates on M Lead
5.9 Types II and III E&M Signaling Interface,
              Connecting Equipment Originates on M Lead
5.10 Type I E&M Signaling Interface, Connecting
              Equipment Originates on E Lead
5.11 Type II E&M Signaling Interface, Connecting
              Equipment Originates on E Lead
5.12 DX Signaling Interface
5.13 Loop-Start Current-Feed Interface
5.14 Ground-Start Current-Feed Interface
5.15 Loop-Start Current-Sink Interface
5.16 Ground-Start Current-Sink Interface
5.17 Loop-Reverse-Battery Current-Sink Interface
5.18 Transmission Only Signaling Interface
5.19 Private Line Automatic Ringdown
5.20 Manual Ringdown Interface
5.21 Code Select Ringdown Interface
5.22 Office Bridge Ringdown Interface
5.23 Type I Tandem Signaling Interface - Station Side
5.24 Type II Tandem Signaling Interface - Station Side
5.25 Type I Tandem Signaling Interface - Switch Side
5.26 Type II Tandem Signaling Interface - Switch Side
6 Analog Transmission Criteria
6.1 Locally-Switched Voice-Grade Analog Transmission
              Criteria
6.2 Designed Special Services Analog Transmission
              Criteria
7 Traffic-Sensitive DLC System Criteria
7.1 Traffic Criteria
7.2 Traffic Monitoring Capabilities
7.3 Blocked Call Treatment
7.4 Provision of Reorder Signal
7.5 Permanent Channel Assignments
7.6 Intra-System Switching
7.7 Sleeve Leads
7.8 Defective Channels
8 Transmission Facility Interface
8.1 Transmission Facility Failure Protection
8.2 Transmission Facility Maintenance
8.3 Metallic Cable Pair Interfaces
8.4 DS1 Transmission Facility Interfaces
8.5 Other Transmission Facility Interfaces
9 Synchronization Criteria
9.1 COT Criteria
9.2 RT Criteria
9.3 Connections To External Composite Clock Sources
10 Environmental and Physical Requirements
10.1 Temperature And Humidity
10.2 Altitude
10.3 Heat Dissipation
10.4 Acoustical Noise
10.5 Airborne Contaminants
10.6 Shock and Vibration
10.7 COT Equipment
10.8 Frame-Mounted RT Equipment
10.9 RT Cabinet Housings
10.10 Fire Resistance - COT
10.11 Fire Resistance - RT
10.12 Human Factors
10.13 Physical Design
10.14 DLC System Line Numbering and Wiring
10.15 RT Stub Cable
10.16 RTs Without Stub Cables
10.17 Multiple RT Systems
10.18 Connectors
10.19 Digital Transmission Facility Pairs
10.20 Backplane Protection
10.21 Maintenance Access To RT Backplane
10.22 RT Installation
10.23 Line Unit Output Test Access
10.24 Line Unit Busy Indicators
10.25 Cable Cross-Connects in RT Cabinet
11 Powering, Electrical Safety and Electromagnetic
              Compatibility Requirements
11.1 COT Powering
11.2 RTs Powered from External dc Sources
11.3 ac Powered RTs
11.4 Battery Reserve
11.5 Grounding
11.6 Electrical Safety and Electromagnetic Compatibility
12 Quality and Reliability
12.1 Reliability Objectives
12.2 Hardware Reliability Predictions
12.3 Reliability Predictions - Availability
12.4 Reliability Predictions - Maintenance
12.5 Reliability Assurance
12.6 Physical Design
12.7 Software Quality
12.8 Manufacturing Process
12.9 Product Support Systems
12.10 Customer Verification of Product Quality and
              Reliability
13 Maintenance and Provisioning Capabilities
13.1 Operations Systems Interfaces
13.2 Generic Operations Interface
13.3 Conversion Between Operations Systems Interfaces
13.4 DLC System Maintenance
13.5 Circuit Maintenance
13.6 Configuration Management
13.7 Per-Circuit User Defined Option Criteria
13.8 Remote Equipment Inventory
13.9 Craft Interface Devices
13.10 DLC System Installation and Repair
14 System Administration
14.1 Documentation
14.2 Supplier Support
14.3 Personnel Training
14.4 Equipment Space Planning
14.5 Equipment Coding
14.6 Transmission Performance Information
14.7 System Description and Application Information
14.8 Central Office Bridging Restrictions
14.9 Priority Lines
Glossary
References
Appendix A: Checklist for TR-NWT-000057 Criteria
List of Tables
Table 4-1 Ringing Signals Applied to COT
Table 4-2 Ringing Signals Applied by RT
Table 4-3 Multiparty Alerting Patterns
Table 4-4 Distinctive Alerting Patterns
Table 4-5 Distinctive Alerting Patterns
Table 5-1 Distinctive Alerting Patterns
Table 5-2 Signaling Interval Durations
Table 5-3 Signaling Interval Durations
Table 10-1 Cable Pair Color Codes
Table 10-2 Binder Group Pair Count

Informs the telecommunications industry of Bellcore's view of Digital Loop Carrier (DLC) system criteria that describes the characteristics and the features needed for general application of DLC systems in the Local Exchange Carrier network. It is not the objective of this document to specify a complete definition of a specific product design. Systems covered by this document consist of a Central Office Terminal located near the customers to be served, and a digital transmission facility connecting the two terminals. Included are criteria on system level functions; carrier transmission facility physical layer interfaces; traffic capacity; & maintenance and operations systems interfaces. Signalling & transmission for locally- & non-locally-switched services & non-switched services are also included.