
CDN 118
TELECOM LINE COUPLING/DECOUPLING NETWORK
Teseq’s CDN 118 coupling-decoupling network is designed for convenient surge testing of telecom-
munications equipme nt to IEC/EN 61000-4-5, which specifi es a 1.2 /50 μs or a 10/ 700 μs pul se. The CDN 
118 includes the special decoupling network and coupling elements that are required for these tests.
The CDN 118 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 compact CDN 118 is a complete set of coupling elements consisting of:
 Telecom line surge testing 
 Complies with IEC/EN 61000-4-5 
 Complete set includes all 
 accessories
 Easy to use bench top housing
 The decoupling network itself
 Interface cables to the surge generator
 Four coupling adapters with a spark gap device
 Four coupling adapters with a spark gap device and a 0.1 μF capacitor
 Matching resistor net work 4 x 100 Ω
 Matching resistor network 4 x 160 Ω
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 confi gured with the CDN 118.
 

CDN 118
TELECOM LINE COUPLING/DECOUPLING NETWORK
Technical specifications
Max. operating voltage:  AC 250 V
DC 250 V 
Max. operating current:  0.5 A 
Ohmic resistance per path:  3 Ω 
Decoupling chokes 1kHz:  20 mH nominal
Pulse:  1.2/50 μs and 10/700 μs pulse 
Max. pulse voltage:  6.6 kV line to ground, 3 kV line to line
Accesories: 
Resistor networks:  INA 172  4 X 100 Ω, 6 W
INA 175  4 X 160 Ω, 6 W 
Coupling adapters:  INA 170  Spark gap device, 90 V trip voltage
INA 171  Capacity 0.1 μF//spark gap device, 90 V trip voltage 
  INA 173  Short circuit connector
Teseq AG 
Nordstrasse 11F 4542 Luterbach S witzerland 
T + 41 32 681 40 4 0 F + 41 32 681 40 48 
sales@teseq.com w ww.teseq.com
© Februa ry 2011 Teseq 
Specifications subject to change without notice. 
®
Tes eq
 is an ISO-registered company. Its products 
are designed and manufactured under the strict 
quality and environmental requirements of the ISO 
9001. This document has been ca refully c hecked. 
However, Teseq 
errors or inaccuracies.
691-258A Februar y 2011
®
®
 does not assume any liability for