This bulletin announces the availability of the outline Subject 2564, Outline of Investigation for Low-Voltage Surge Withstand Telecommunications Overcurrent Protector Components, Subject 2566, Outline of Investigation for PART 2: Low-Voltage Surge Withstand Telecommunications Fuses, Subject 2567, Outline of Investigation for PART 3: Low-Voltage Surge Withstand Telecommunications Polymer Positive Temperature Coefficient Thermistor (PPTC), Subject 2569, Outline of Investigation for PART 5: Low-Voltage Surge Withstand Telecommunications Line Feed Resistor (LFR), Subject 2570, Outline of Investigation for PART 6: Low-Voltage Surge Withstand Telecommunications Electronic Current Limiters (ECL).