Introduction:
The NTFM 8158 is an ISN Impedance Stabilization Network for CAT6 cable manufactured by Schwarzbeck, Germany and authorized for sale by EUTTEST, Shenzhen, China. The ISN NTFM-8158 allows the measurement of common-mode interference voltages on unprotected twisted-pair UTPs or communication ports with 2, 4, 6, or 8 conductors, as required by the CISPR 22:2005 or CISPR32 standards. Common mode interference voltage measurements are performed on unprotected twisted pair UTPs or communication ports with 2, 4, 6 or 8 conductors. The device under test, the EuT, or an auxiliary device, the AE, can be connected using an RJ-45 network cable jack. The pin assignment follows EIA/TIA-T568A/B. The circuit principle of the 8158 is designed according to Figure D.3 of CISPR 22 Edition 5.2 and does not affect the transmission quality up to Gigabit Ethernet.
Technical parameters:
“Reminder: swipe tables left and right”CISPR32
typ.: < 2.5 dB 30 MHz to 250 MHz
59 dB @ 30 MHz (Fig.5)
>30 MHz: 150 Ω + 60 Ω / -45 Ω ≤
Technical data charts:

LCL Longitudinal Conversion Loss Curve

Partial pressure coefficient graph

Common mode impedance graph
We also offer more available ISN impedance stabilization networks and AAN asymmetric artificial networks to choose from. Click on the links below to find out:
How to select ISNs and AANs by test standard requirements?
EUTTEST is an official authorized distributor of SCHWARZBECK, whose full official name is: SCHWARZBECK MESS - ELEKTRONIK OHG
Ltd. is authorized by schwarzbeck to sell all products in China and provide technical service for the products sold.

Schwarzbeck Product List Schwarzbeck
CAT3 8158 Schwarzbeck
CAT5 8158 Schwarzbeck
NSLK 8128 Schwarzbeck
NNLK 8129 Schwarzbeck
NNLK 8121 Schwarzbeck
NSLK 8127 Schwarzbeck
NNLK 8130 Schwarzbeck
NNHV 8123-200 Schwarzbeck