Teseq ISN T8-CAT6 Impedance Stabilization Network

Teseq ISN T8-CAT6 Impedance Stabilization Network
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Teseq (Schaffner) ISN T8-CAT6
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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-Cat6 is designed for measurements on up to four unshielded single balanced pairs shown at D.3 (ISN with high longitudinal conversion loss (LCL) for use with one, two, three, or four unscreened balanced pairs) in CISPR 22, Ed.5.2, 2006 and EN 55022 Sept. 2006 (IEC/CISPR 22: 2005 modified). The longitudinal conversion loss (LCL)- requirements for the EUT-side is realized in relation to the cable category cat.6. No additional adapters are required. For other cable categories Teseq offers a different ISN with LCL adapters for cat.3 and cat.5 which is called ISN T8.


Frequency range 150 kHz - 80 MHz
Line parameters 1 up to 4 pair(s)
Power rating (EUT- and AE Port) AC max. voltage
(line to ground):
63 V
DC max. voltage
(line to ground):
100 V
Current max: 400 mA (line), 800 mA (pair)
Test voltage: 200 VDC, 2 sec
Common mode impedance (EUT Port) 150 kHz - 30 MHz: 150 ohm ±20 ohm
30 MHz - 80 MHz: 150 ohm +60 ohm /-45 ohm
Phase angle (EUT Port) 150 kHz to 30 MHz 0° ±20°
Coupling path (In/Out-port/EUT) Connection: BNC 50 ohm
RF voltage: <15 V
Frequency range: 150 kHz - 80 MHz
Voltage division factor (RF input to EUT port) 150 kHz - 30 MHz: 9.5 dB ±1 dB
30 MHz - 80 MHz: 9.5 dB ±2 dB
Transmission bandwidth (wanted signal) EUT/AE: B3 dB 250 MHz sin. typical
LCL* (EUT) Cat. 6 150 kHz - 2 MHz: 75 dB to 74.4 dB ±3 dB
Cat. 6 2 MHz - 30 MHz: 74.4 dB to 59.3 dB +6/-3 dB
Decoupling of common mode disturbances (EUT / AE) 150 kHz to 1.5 MHz: ≥35 dB to ≥55 dB
1.5 MHz to 30 MHz: ≥55 dB
Crosstalk* (PSELFEXT) (EUT / AE)
1 MHz - 250 MHz
≥61 dB to ≥15 dB
*) all balanced parameters are in relation to a symmetrical load of 100 ohms