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Coupling Decoupling Network for unshielded symmetrical high speed communication lines

CDN HSS-2zoom
  • CDN for 1.2/50 μs pulse as per IEC 61000-4-5 Edition 3
  • CDN for up to 8 wire unshielded twisted pair (UTP)
  • Coupling to 1, 2 or 4 pairs
  • ISDN, 10/100BaseT, 1000BaseT
  • PoE applicable

The Coupling Decoupling Network CDN HSS-2 is designed for convenient surge testing with 1.2/50 μs pulses, as defined in IEC/EN 61000-4-5, on unshielded symmetrical high speed telecommunication lines e.g. Ethernet. Coupling modes to 1, 2 or 4 pairs are given and coupled with 40 Ω in series with a capacitive coupling element. The CDN HSS-2 allows testing on ISDN and Ethernet with 10/100BaseT and 1000BaseT as well. Power over Ethernet (PoE) is applicable.
With a surge test voltage of 2 kV is the maximal residual voltage at the AE port only 65 V due to the excellent decoupling network. Additional decoupling elements are not required to protect the auxiliary equipment (AE). The high decoupling provides an AE independent pulse shape for the EUT testing. A high measurement reproducibility is given by using the CDN HSS-2. The decoupling network is in accordance with IEC 61000-4-5 Edition 3. It can be used with Teseq’s NSG series or any industry standard surge generator with the appropriate connector adapter.

Parameter Value

Circuit diagram

according to Fig. 11 of IEC 61000-4-5 Ed. 3

Max. surge test voltage

2 kV* (1.2/50 μs pulse as per IEC/EN 61000-4-5)

Max. surge test current

50 A (8/20 μs pulse as per IEC/EN 61000-4-5)

Coupling mode

Common mode to 1, 2 or 4 pairs with respect to CDN chassis

Coupling elements

40 Ω in series with capacitive coupling elements




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4153 Reinach, Switzerland
Tel.+ 41 61 204 41 00

Managing Directors:
Brian Huntsman
Astrid Wälchli Schreiber
VAT-ID: CHE-179.452.414
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