TR TSY 000465 : ISSUE 2

1. INTRODUCTION
1.1 Loop Testing
1.2 The Pair Gain Test Controller Interface
1.3 Organization of this Technical Reference
1.4 Reasons for Reissue
2. GENERAL DESCRIPTION OF THE PAIR GAIN TEST CONTROLLER
2.1 Introduction
2.2 Capabilities
2.3 PGTC Installation
3. PGTC TO CARRIER SYSTEM INTERFACE FOR DROP TESTING
3.1 Required Carrier System Interfaces
3.2 Overview of PGTC Operation
3.3 PGTC Interfaces to the Carrier System Channel
           Unit
3.3.1 Carrier System Channel Unit On-Hook dc Signature
3.3.2 Test Initiate Signal
3.3.3 Tone from Channel Unit
3.3.4 AC Induction
3.4 Carrier System to PGTC Tester Trunk Interface
3.4.1 Test Initiation Control Signals
3.4.2 DC Test Pair Connection Sequence
3.5 Carrier System to Carrier System Interface
4. PGTC TRANSMISSION AND SIGNALING TESTS
4.1 General Description of PGTC Tests
4.2 Measurement Details
4.2.1 Test Signal
4.2.2 Return Loss Measurements
4.2.3 Idle Channel Noise
4.2.4 Tip Party Identification Tests
4.3 Test Sequences
4.3.1 Duration of Tests
4.3.2 Test Failure Indications
4.4 Guide to Tables 4-1 Through 4-3
4.4.1 Purpose of Test
4.4.2 PGTC Test Conditions
4.4.3 RT Terminations
4.4.4 COT Conditions Required to Pass Test
5. PGTC TO LOOP TESTING SYSTEM INTERFACE
5.1 General Operation
5.2 Loop Testing System Requirements
5.2.1 Accessing the Carrier's Channel Unit
5.2.2 Testing of Central Office Wiring
5.2.3 Activating the PGTC
5.2.4 Obtaining the Results of the PGTC Carrier Channel
           Test
5.2.5 Loop Testing System Disconnect
6. PGTC APPLICATION GUIDELINES
6.1 Bridged Taps on the dc Test Pair
6.2 Maximum Lines Per dc Test Pair
7. REFERENCES
APPENDIX A. SM88C TEST RESULT DISPLAY
LIST OF FIGURES
Figure 2-1. Electrical Connections and Location of PGTC
Figure 2-2. Connection Details of PGTC
Figure 3-1. PGTC Interfaces
Figure 3-2. DC Signature
Figure 3-3. Valid Test Initiate Signals
Figure 3-4. Invalid Test Initiate Signals
Figure 3-5. Path Between Carrier System and PGTC
Figure 3-6. Test Control Lead Test Circuit
Figure 4-1. RT Termination State Diagram
Figure 4-2. PGTC Test Circuitry
LIST OF TABLES
Table 3-1. Acceptable COT Channel Unit On-Hook Signatures
Table 3-2. PGTC to Carrier System Connector Pin
              Assignments
Table 4-1. Tests Applied to all Channel Units
Table 4-2. Coin Tests
Table 4-3. Multiparty Tests
Table 5-1. Carrier Channel Test Results
Table 5-2. Carrier Channel Test Results that May be
              Implemented in the Future
Table A-1. Table 4-1 Test Results
Table A-2. Table 4-2 Test Results
Table A-3. Table 4-3 Test Results

Defines an interface between loop carrier systems and loop testing systems. This interface is applicable to the testing of single party, multiparty and coin telephone services provided over loop carrier systems that interface with local switching systems on an analog basis. The information in this Technical Reference (TR) will allow manufacturers of loop carrier systems/loop testing systems to independently design their systems to be compatible with each other and with present loop testing procedures.