TR TSY 000008 : ISSUE 2 REV 1

1 INTRODUCTION
         1.1 Purpose of this Document
         1.1.1 General Comments
         1.1.2 Reasons for Reissue
         1.1.3 Relation to Other TA/TRs
         1.2 General System Description
         1.2.1 Configurations
         1.2.2 Functional Terminology
         1.2.3 Modes of Operation
         1.3 Organization of this Technical Reference
2 ELECTRICAL SPECIFICATIONS
         2.1 General
         2.2 Loss
         2.3 Delay
3 FRAMING AND SIGNALING
         3.1 DS1 Frame Organization - General
         3.2 Channel Numbering
         3.3 Time Slot Assignment
         3.3.1 Modes I and III
         3.3.2 Mode II
         3.4 Per-Channel Signaling
         3.4.1 A and B Bit Signaling
         3.4.2 Signaling States
         3.5 The Data Link
         3.5.1 Data Link Format
         3.5.2 Concentrator Field
         3.5.3 First Spoiler Field
         3.5.4 Maintenance Field
         3.5.5 Alarm Field
         3.5.6 Protection Line Switch Field
         3.5.7 Second Spoiler Field
4 CALL CONTROL
         4.1 Per-Channel Signaling for Call Control
         4.2 Concentrator Field Messages for Call Control
         4.3 Call Control Examples: Single Party Channel
                  Units
         4.3.1 Customer On-Hook
         4.3.2 Calls Originating at the RT
         4.3.3 Calls Terminating on the RT
         4.3.4 Stable Calls
         4.3.5 Call Disconnect
         4.3.6 Summary of Mode II Call Control Messages
         4.3.7 Unequipped Channels
         4.4 Call Control For Multiparty Channel Units
         4.4.1 Signaling Patterns Sent to the RT
         4.4.2 Signaling Patterns Sent to the LDS
         4.5 Call Control For Coin Channels
         4.5.1 Signaling Patterns Sent to the RT
         4.5.2 Signaling Patterns Sent to the LDS
         4.6 Call Control For Switched VF Ground
                  Start Circuits
         4.6.1 Signaling Patterns Sent to the RT
         4.6.2 Signaling Patterns Sent to the LDS
         4.7 Call Control for Direct Inward Dialing
                  Channel Units
         4.7.1 Signaling Patterns Sent to the RT
         4.7.2 Signaling Patterns Sent to the LDS
         4.8 Call Control of Switched VF Specials
                  Using D4 Channel Units
         4.8.1 Mode I
         4.8.2 Mode II
         4.8.3 Mode III
5 SYSTEM MAINTENANCE
         5.1 System Maintenance Information
         5.1.1 The Data Link
         5.1.2 Yellow Alarm
         5.1.3 Blue Alarm
         5.1.4 Maintenance Information at the NOTE
         5.2 Maintenance Information Detected by the LDS
         5.2.1 Data Link Information Detection
         5.2.2 Loss of Data: Modes I and III
         5.2.3 Loss of Data: Mode II
         5.2.4 PCM Looping Test
         5.2.5 Yellow Alarm
         5.2.6 Out of Frame Detection
         5.2.7 Continuous Loss of Signal
         5.2.8 Bipolar Violations
         5.2.9 Protection Line
         5.3 Maintenance Information Detected by the RT
         5.3.1 Data Link Information Detection
         5.3.2 Loss of Data: Modes I and III
         5.3.3 Loss of Data: Mode II
         5.3.4 Yellow Alarm
         5.3.5 Out of Frame Detection
         5.3.6 Continuous Loss of Signal
         5.3.7 Bipolar Violations
         5.3.8 Protection Line
         5.4 Automatic Maintenance Capability
         5.5 Manual Maintenance Capability
6 CHANNEL AND CUSTOMER LOOP TESTING
         6.1 General
         6.2 Initiation of Test Configuration
         6.3 Failure to Establish a Test Configuration
         6.4 Channel Tests
         6.4.1 Transmission Tests
         6.4.2 Signaling Tests
         6.5 Metallic Testing of the Customer Loop
7 PROTECTION LINE SWITCHING
         7.1 General Requirements
         7.2 Causes of a Protection Line Switch
         7.2.1 LDS
         7.2.2 RT
         7.3 Protection Line Switching Procedure

Describes Bellcore's view of an interface between the SLC-96 system and a Local Digital Switch (LDS). Its purpose is to present sufficient technical data about the information that flows across the digital and metallic interfaces so that a LDS can interface with the SLC-96 system. The appendix of this document also describes an interface between present loop testing systems and local digital switches for lines served by direct digitally interfaced loop carrier systems.