Teseq CDN 117A - 4 Line Unsymmetrical Surge CDN

Teseq Unshielded Surge CDN:

  • Coupler for both Surge & Ringwave Pulses
  • Usable with Many Generators with Connector
  • Maximum Surge 4.8kV 4 lines, 1Amp 
  • Manual CDN for up to 4 Pairs of Data Lines
  • Compliant CDN to IEC/EN 61000-4-5/-12

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Data/Telecom Line CDN Equipment



Teseq’s CDN 117 coupling-decoupling network is designed for convenient surge testing of telecommunications equipment to IEC/EN 61000-4-5, which specifies a 1.2/50 μs or a 10/700 μs pulse. It includes the special decoupling network and coupling elements that are required for these tests.  The design of the CDN is given in IEC 61000-4-5 Ed.3 Figure 10 and A.4. It can be easily interfaced with the EUT and is designed as a bench top unit. It can be used with Teseq’s NSG series or any industry standard surge generator with the appropriate connector adapter.

The user can manually select coupling modes by connecting the generator’s output to the appropriate input. All coupling methods described in the standard can be configured with the CDN 117. Two CDN 117 main units can be arranged in parallel for testing eight line applications (low speed transmission only). 

Data Sheet User Manual CDN 117 Manual CDN 117 & CDN 118


Technical specifications

Teseq CDN 117A-C4-4-1

Max operating voltage AC 250 V, DC 250 V 
Max operating current 1 A
Max pulse voltage CDN 117A-C4-4-1: 4.8kV
Ohmic resistance per path <1.0 Ω (typical 0.49 Ω)
Decoupling chokes 1 kHz: 20 mH nominal each line
Transmission 3 dB BW 1100 Hz (@ 1 kΩ load)
Connectors 4 mm safety banana, to generator and EUT

Surge: 1.2 / 50 μs pulse

Ring wave: 0.5 μs / 100 kHz pulse

Surge coupling

- 0.5 μF capacitor via 40 Ω

- GDT: Gas discharge tube (90V) via 40 Ω

- ABG: Avalanche breaking diode (140V) via 40 Ω

Ring wave coupling capacitor >=3 μF
Included Accessories


HV cable Banana – Banana, 0.5 m, 1 x red, 1 x black

Earth connection 1 brass bar 0.3 m including mounting parts, screw M4 x 10 mm
User manual Delivered on USB memory card
Calibration certificate included
Protection module options
VPM 250-100

Varistor Module 250 V, 250 VAC, 350 VDC, Impedance to GND: 100 kΩ

DPM 50-1 Module 50 V, bidirectional diodes, Impedance to GND: 1 kΩ per line
DPM 50 Module 50 V, bidirectional diodes, Impedance to GND: open circui

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