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Communication equipment products POE 45-78 power supply POE 45-78 power supply RJ11 protection scheme 48V power protection POE 45-78 power supply Recommended products Ceramic gas discharge tube Glass discharge tube High energy ignition discharge tube Switch gas discharge tube Transient suppression diode Electrostatic protection diode Thyristor Surge Suppressors Varistor Signal Power supply Thermistor Self recovery fuse Thermal Fuse