GR 1 CORE : ISSUE 1

Preface
1 Introduction
  1.1 Purpose and Scope
2 Station Protector Limiting Voltages
3 Metallic Surges - Lightning
4 Longitudinal Surges - Lightning
5 Power-Caused Voltages and Currents
  5.1 Long-Term Induction on Telephone Conductors
  5.2 Power Line Fault Induction on Telephone Conductors
  5.3 Power Contact to Telephone Conductors
6 Radio Frequency Voltages
  6.1 General
  6.2 Factors Influencing RF Coupling
  6.3 Factors Influencing Interference from RF Voltages
  6.4 Characteristics of RF Voltages at the NI
Appendix A: References
Note
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Specifies a description of externally caused voltages and currents that may be encountered at the Local Exchange Carriers (LEC's) Network Interface (NI). Covers externally caused voltages and currents at the NI as a result of disturbances to the LEC communications network facilities from power systems, lightning, and radio transmitters.