An Impedance stabilization Network (ISN) is required for the measurement of conducted common mode noise on Telecom Cables of Information Technology Equipment (ITE). These measurements are necessary to meet the requirements specified in CISPR 22 and CISPR 32 standards.
The ISN is placed in the path of the cable connecting the equipment under test (EUT) and its support equipment (Also referred to as auxiliary equipment or AE). The impedance stabilization network performs three functions during the test.
Different ISN models are available for specific category of line as well as the number of conductors in the line the connector type and pin-arrangement in the connector.