D. McKinnon, ast technology Labs, Inc. (To be ansi/tia-571-B) Telecommunications Telephone Terminal Equipment Environmental Considerations

1. INTRODUCTION iii

2. SCOPE iv

3. DEFINITIONS v

3.1. Earth (Ground) v

3.2. Exposed Surfaces v

3.3. Grounding Conductor v

3.4. Network Interface or Demarcation Point v

3.5. Normal Operation v

3.6. Outside Plant Interface Leads (OP) v

3.7. Temperature Stabilization v

4. TECHNICAL REQUIREMENTS vii

4.1. GENERAL vii

4.2. PHYSICAL ENVIRONMENT viii

4.3. ELECTRICAL ENVIRONMENT xii

ANNEX A (Normative) REFERENCES xxv

ANNEX B (Informative) RATIONALE FOR TELEPHONE LINE OVERVOLTAGE TESTS (4.3.2.3) xxvi

B1. Sources of Overvoltage xxvi

B2. Analysis of Limiting Overvoltage Conditions xxvi

B3. Performance of Telecommunications User Premises Equipment xxvi

B4. 2-Line and 4-Wire Circuits xxvii

B5. Multiple Sets xxvii

B6. Wiring Simulation xxvii

B7. Primary Protector Coordination xxviii

B8. Test Points xxviii

B9. Test Conditions xxviii

B10. Failure Conditions xxviii

ANNEX C (Informative) RATIONALE FOR SURGES (4.3.3) xxix

C1. Sources of surges xxix

C2. Traditional telecom surge specification xxix

C3. Surge types xxix

C4. Open circuit voltage and voltage waveshape xxx

C5. Short circuit current and current waveshape xxxi

C6. Surge studies and data xxxi

C7. Standards on surges xxxii

C8. Surge likelihood xxxiii

C9. Surges for telecommunications equipment xxxiii

ANNEX D (Informative) GROUNDING PRACTICES xxxiv

Figure 1 – PBX with Interfaces vi

Figure 2 – Surge Generators xv

Figure 3 – Application of Surge Generators xvi

Table 1 – Range of Temperature & Relative Humidity xi

Table 2 – Input Voltage Characteristics xii

Table 3 – Lightning type abbreviations xv

Table 4 – High Voltage Surges xviii

Table 5 – ESD Discharge voltages and methods xx

Table 6 – Test voltage vs. altitude multipliers xxii

Table 7 – ESD response mode distribution xxiii

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