ISN for Conducted Emissions from Telecom

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ISN-T2

150 kHz to 30 MHz

ISN for Conducted Emissions from Telecom

▸ Impedance Stabilization Network, 150 kHz–30 MHz — measures common-mode disturbance voltage on a single unshielded balanced pair (Cat. 3 or Cat. 5 cabled networks).
▸ Per EN 55022 [CISPR 22] Figure D.1 circuit topology — meets the applicable requirements of EN 55022:2010+AC:2011 (CISPR 22:2008 Ed. 6.0) and CISPR 16-1-2:2014 Ed. 2.0.
▸ 150 Ω common-mode impedance per CISPR 22 — presents a defined termination so the EUT-side disturbance reaching the measurement port is stable and repeatable.
▸ Single unshielded balanced pair telecom ports — xDSL modems, analog telephony, doorbell, and other 2-wire balanced telecom interfaces qualified under CISPR 22/32.
▸ Cat. 3 and Cat. 5 cabled networks — ships with Cat. 3 and Cat. 5 LCL (Longitudinal Conversion Loss) adapters so the same ISN supports either cable category.
▸ Wanted-signal transmission bandwidth 100 MHz — passes the working signal during emissions measurement without distortion of the link.
▸ 800 mA per line / 1.6 A per pair, 50 V DC / 32 V AC line-to-ground — supports typical bias and ring/power-feed currents on telecom pairs.
▸ Individually calibrated; pairs with the Com-Power SPA-900TG series spectrum analyzer / EMI receiver for conducted telecom emissions scans.

ISN-T2 Features

▸ Frequency range 150 kHz to 30 MHz
▸ For disturbance measurements on a single, unshielded, balanced pair
▸ Circuit concept per Figure D.1 of EN 55022:2010+AC:2011 (CISPR 22:2008 Ed. 6.0)
▸ Meets applicable requirements of EN 55022 and CISPR 16-1-2:2014 Ed. 2.0
▸ Provided with Cat. 3 & Cat. 5 LCL adapters — one ISN covers both cable categories
▸ 150 Ω common-mode impedance — per CISPR 22 ISN specification
▸ Transmission bandwidth 100 MHz — preserves the wanted signal during measurement
▸ 800 mA per line / 1.6 A per pair EUT-AE current rating
▸ Voltage rating 50 V DC / 32 V AC line to ground (50/60 Hz)
▸ Individually calibrated

ISN-T2 Specifications

Parameter	Specification
Model	ISN-T2
Type	Impedance Stabilization Network (ISN) — unshielded balanced pair
Applicable Standards	EN 55022 (CISPR 22), CISPR 16-1-2
Frequency Range	150 kHz to 30 MHz
Line Parameters	(1) unshielded balanced pair
Cable Categories Supported	Cat. 3 and Cat. 5 (via included LCL adapters)
Common-Mode Impedance	150 Ω nominal (150 kHz to 30 MHz)
Transmission Bandwidth (wanted signal)	100 MHz
Voltage Rating (EUT/AE Port)	50 V DC / 32 V AC (line to ground @ 50/60 Hz)
Current Rating (EUT/AE Port)	800 mA per line; 1.6 A per pair
Reference Circuit	EN 55022:2010+AC:2011 Figure D.1 (CISPR 22:2008 Ed. 6.0)
Calibration	Individual calibration included

Application: Single-pair unshielded telecom ports (xDSL, analog telephony, 2-wire balanced signaling) tested for conducted common-mode emissions per CISPR 22/32.
Included accessories: Cat. 3 and Cat. 5 LCL adapters — supports either cable category without replacing the ISN.

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