Impedance stabilization networks (ISN) are coupling/decoupling networks according to CISPR 22 (EN 55022) for measurement of conducted common mode disturbances of
information technology equipment (ITE).
The ISN is placed between the equipment under test (EUT) and the auxiliary equipment (AE) or load which is necessary for the operation of the EUT. The ISN establishes the common mode termination impedance seen by the telecommunication port during measurement.
The ISN T8 consists of one basic network (ISN T800) with D-Sub-25 connectors, and
LCL adapter sets for cable cat.3 and cat.5. Each adapter set includes connectors for
both the EUT and auxiliary equipment. There are pre-wired RJ11 and RJ45 adapter sets for most common pin configurations, as well as customizable adapter sets which can be freely wired for any pin configuration.
The ISN T8 is defined in figure D.3 of CISPR 22, Ed.5.2, 2006 and EN 55022 Sept. 2006
(IEC/CISPR 22: 2005 modified) and allows the use with one, two, three, or four unscreened balanced pairs, up to 1000BaseT operation and Power over Ethernet (PoE) application.