This standard sets terms, test methods, test circuits, measurement procedures, and preferred result values for the surge parameters of isolating transformers used in networking devices and equipment. Three types of isolating transformer are considered: mains low frequency power, high frequency power (switching mode power supplies) and signal (e.g., Ethernet data). The surge parameters of the isolating transformer insulation barrier covered by this standard are as follows: - Rated impulse voltage - Input winding to output winding capacitance - Insulation resistance Additional parameters for signal isolating transformers are as follows: - Core saturation voltage-time product - Rated input winding rms current for a given temperature rise This standard does not cover the transformer parameters required to help ensure appropriate operation on the service (e.g., signal transformer return loss).