ITU-T K.20 and K.21
Table 4.10 K.20 Lightning Test Conditions for Telecom Equipment in Central Office/Remote Terminal
Voltage (10x700 µs)
Single Port
Metallic and
Longitudinal
Multiple Ports
Longitudinal Only
Basic/Enhanced
Current (5x310 µs)
Basic/Enhanced
(A)
Acceptance
Criteria
Basic/Enhanced
Repetitions *
Primary Protection
None **
Installed if used
None
1 kV/1.5 kV
4 kV/4 kV
25/37.5
100/100
37.5/37.5
100/150
±5
±5
±5
±5
A
A
A
A
1.5 kV/1.5 kV
4 kV/6 kV
Installed if used
* One-minute rest between repetitions
** This test is not conducted if primary protection is used.
Equipment Under Test
A
25 Ω
Decoupling
Elements
Surge
Generator
E
B
a) Transversal test
Equipment Under Test
A
25 Ω
Decoupling
Elements
Surge
Generator
E
B
R3 = 25 Ω
b) Longitudinal test
Figure 4.3 Connection Appearances
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