Telecom

High speed communication lines


Surge, Telecom, ring wave CDNs for interconnection and control lines

Conducted immunity test specified in the IEC 61000-4-X series are applied to a broad series of ports/lines. The major categories in standards like IEC 61000-4-5 and IEC 61000-4-12 are: AC/DC power lines and interconnection lines.

How to choose a CDN for interconnection lines?

The major differences when applying surge, telecom surge (10/700 μs voltage waveform as per Annex A from IEC 61000-4-5) and ring wave refer to test levels, source impedance and coupling mode (differential and/or common mode).

The interconnection lines are themselves subdivided categories in function of two parameters: symmetrical/unsymmetrical and shielded/unshielded. Hence four categories of interconnection lines result, as described in the table below.

 

interconnection lines

Surge 1.2/50 μs and ring wave are to be applied in differential mode and common mode on unsymmetrical unshielded lines. There are no requirements to apply 10/700 μs surge on unsymmetrical unshielded lines. 
Surge, telecom surge and ring wave disturbances are to be applied only in common mode to symmetrical unshielded lines.
Finally, shielded lines do not require a CDN, as the impulses coming from generator output are applied directly on the shield.

Test equipment

The CDNs provided by EMC PARTNER for interconnection lines (listed in the table above) are designed to cover a broad range of applications. CDN-UTP8 ED3 for example, can be used for both high speed symmetrical (1 Gbps) and unsymmetrical interconnection lines, apply up to 6 kV surge and ring wave disturbances in both differential mode and common mode. Technical specifications can be found in the technical specifications.

IEC 61000-4-4

Electromagnetic compatibility (EMC) - Part 4-4: Testing and measurement techniques

IEC 61000-4-5

Electromagnetic compatibility (EMC) - Part 4-5: Testing and measurement techniques - Surge immunity test

ITU-T K.20

Resistibility of telecommunication equipment installed in a telecommunication centre to overvoltages and overcurrents  

ITU-T K.21

Resistibility of telecommunication equipment installed in customer premises to overvoltages and overcurrents  

ITU-T K.44

Resistibility tests for telecommunication equipment exposed to overvoltages and overcurrents - Basic Recommendation  
Current tester - Designed to test coaxial port with SURGES of 20 kA 8/20us.
MIG0624TEL

10/350µs Impulse current generator
CTS-10350

Automatic 3-Phase CDN up to 32A / 8kV for EFT, Surge and Ringwave (690V)
IMU-MGE

Power induction tester according to ITU- T K.44 and ITU-T K.45.
MIG-ITU-K44

Telecom Tester 1.2/50 - 10/700 up to 6kV/3kA
MIG0603EN S-T-I

Impulse Insulation Testers from 500 V to 30 kV
INS-1250

Impulse current generator 10/350
TEL0305LP3

MIG1206-3P-T
Combination Wave Generator according to IEC 61000-4-5 12kV/6kA 2 Ohm with automatic three phase coupling network 480V and 32A.
MIG1206-3P-T

Combination Wave Generator according to IEC 61000-4-5,12kV/6kA 2 Ohm with automatic single phase coupling network 480V and 32A
MIG1206-1P-T

Test cabinet made of acrylic glass, With interlock safety switch and warning lamps for MIG generators
TC-ST

External emergency stop switch
EMERGENCY-STOP

3000W Single phase Power Source with pre-programmed voltage & frequency combinations
PS3 - Power Source 3P

Resistor set for the power contact testing in accordance with ITU-T K44
PCPI160E

Coupling Network for power induction tests according to ITU-T K44
NW-K44PI

External Red and Green warning lamps
WARNING-LAMP

Extension Network to perform Power Contact (PC) tests according to ITU-T K.44
NW-K44PC

CDN for 1.2/50, Ringwave and 10/700 SURGE coupling up to 6kV on up to 4 pair (8 wires)
CDN-UTP8 ED3

CDN for 1.2/50, Ringwave and 10/700 SURGE coupling up to 6kV on up to 4 pair (8 wires)

CDN for 1.2/50, Ringwave and 10/700 surge coupling 6kV to 2 pair (4 wires) balanced communication lines
CDN-UTP ED3

CDN for 1.2/50, Ringwave and 10/700 surge coupling 6kV to 2 pair (4 wires) balanced communication lines

Address

EMC PARTNER AG
Baselstrasse 160
CH - 4242 Laufen
Switzerland