Telecom disturbances

AN3007

4/20

Doc ID 16018 Rev 1

Figure 4.

IEC 61000-4-5 - simplified schematic of test setup

The IEC 61000-4-5 standard requires five applications of each polarity on the equipment.

This standard defines several acceptance criteria depending on the state of the equipment

after the test (performance still ok, degradation of the performance, damage of the

equipment).

Ethernet applications usually recommend the A criterion of IEC 61000-4-5. That is, normal

performance of the equipment after test.

The most commonly used standard to qualify Ethernet equipment against ESD is the

IEC 61000-4-2 standard.

Table 2 gives the test voltage for each test level of the standard, for both contact and air

discharge tests. Generally, Level 4 is required, i.e. the equipment has to withstand 8 kV

contact and 15 kV air discharge.

Similarly, Ethernet applications usually recommend the A criterion of IEC 61000-4-2.

Table 1.

IEC 61000-4-5 surge test levels

Level

Open-circuit test voltage (kV)

10.5

21.0

32.0

44.0

Table 2.

IEC 61000-4-2 test levels

1a - contact discharge

1b - air discharge

Level

Test voltage

Level

Test voltage

12

1

2

24

2

4

36

3

8

48

4

15

EUT

Combination

wave

generator

S1

S2

Decoupling network

R=40

Ω

C

Earth reference