Impedance Stabilization Network for 8 lines

(855) 364-2362

ISN-T8

150 kHz to 30 MHz

Impedance Stabilization Network for 8 lines

▸ Impedance Stabilization Network, 150 kHz–30 MHz — measures common-mode disturbance voltage on unshielded balanced telecom ports with up to four pairs.
▸ Per CISPR 22 Figure D.3 / CISPR 32 Figure F.8 circuit topology — complies with CISPR 16-1-2, CISPR 22, and CISPR 32 for conducted telecom emissions.
▸ D-sub 25-pin EUT and AE ports with RJ-45 or RJ-11 interface options — D-sub on the ISN mates to an external LCL adapter (EUT side) and connecting adapter (AE side), so one ISN serves multiple cable categories and connector styles.
▸ Unshielded Ethernet ports on ITE and consumer electronics — PCs, network appliances, IP phones, set-top boxes, and access points with unshielded Cat. 5/5e/6 jacks.
▸ Analog and digital telephony with multi-pair drops — key systems, PBX line cards, and 25-pair amphenol-style telephony connections.
▸ Low-speed industrial and building-automation links — RS-485 / Modbus, BACnet MS/TP, and similar multi-pair unshielded balanced signaling.
▸ 50 Ω BNC RF port on top of network — direct mate to spectrum analyzer / EMI receiver during emissions scans.
▸ 800 mA per line / 1.6 A per pair, 100 V DC / 64 V AC line-to-ground — individually calibrated; pairs with the Com-Power SPA-900TG series spectrum analyzer / EMI receiver.

ISN-T8 Features

▸ Frequency range 150 kHz to 30 MHz
▸ For unshielded telecommunication lines with 1 to 4 balanced pairs
▸ Complies with CISPR 16-1-2, CISPR 22, CISPR 32
▸ Circuit concept per CISPR 22 Figure D.3 and CISPR 32 Figure F.8
▸ D-sub 25-pin EUT and AE ports — mate via LCL Adapter (EUT) and Connecting Adapter (AE)
▸ RJ-45 EUT/AE connections (RJ-11 also available) — covers standard Ethernet and telephony interfaces
▸ 50 Ω BNC (female) RF port on top — direct mate to spectrum analyzer / EMI receiver
▸ 150 Ω common-mode impedance — per CISPR 22 ISN specification
▸ 800 mA per line / 1.6 A per pair EUT-AE current rating
▸ Voltage rating 100 V DC / 64 V AC line to ground (50/60 Hz)
▸ Individually calibrated

ISN-T8 Specifications

Parameter	Specification
Model	ISN-T8
Type	Impedance Stabilization Network (ISN) — unshielded multi-pair
Applicable Standards	CISPR 16-1-2, CISPR 22, CISPR 32
Frequency Range	150 kHz to 30 MHz
Application	Unscreened lines with up to 4 balanced pairs
EUT / AE Port Type	D-sub 25-pin (front: EUT; rear: AE)
Cable-Side Connector	RJ-45 (RJ-11 also available) via adapter
RF Port Connector	50 Ω BNC (female), top of enclosure
Common-Mode Impedance	150 Ω nominal
Voltage Rating	100 V DC / 64 V AC (line to ground @ 50/60 Hz)
Maximum Current Rating	800 mA per line; 1.6 A per pair
Reference Circuit	CISPR 22 Fig. D.3; CISPR 32 Fig. F.8
Calibration	Individual calibration included

Application: Multi-pair unshielded telecom and Ethernet ports tested for conducted common-mode emissions per CISPR 22/32.
Adapter system: The D-sub 25-pin EUT and AE ports interface to external LCL Adapter (EUT side) and Connecting Adapter (AE side), so the same ISN supports multiple cable categories and connector styles (RJ-45 standard; RJ-11 also available).

ISN-T8 Impedance ISN-T8 Isolation ISN-T8 Phase ISN-T8 Voltage Division Factor ISN-T8 Cat 3 - Longitudinal Conversion Loss (LCL) ISN-T8 Cat 5 - Longitudinal Conversion Loss (LCL)