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电信设备K.21 Amendment 1雷击测试

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K.21

K.21
K.21 Amendment 1 (06/2020) -TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU
安装在客户场所的电信设备对过电压和过电流的抗扰度 修正案 1

范围
本标准涵盖的设备类型包括所有类型的电信设备，例如调制解调器、电话、路由器、数字用户线路的实现和个人电脑。
注 – 包含通过短电缆连接到地的低浪涌阻抗端口的相关设备，例如，使用通用串行总线 (USB) 电缆的打印机可能会因接地循环而受到损坏电流。保护方法参见[ITU-T K.66]和[b-ITU-T K.85]。
本标准适用于外部和内部端口。 [ITU-T K.44]，涵盖基本测试方法和测试电路，是本建议书的组成部分。

– 外部端口的适用测试-Applicable tests for external ports
Test type
No. of pairs simultaneously tested
Test connections
Primary protection
Port type
Symmetric port
Co- axial port
Dedicated power feed port
Mains power port
Lightning/ voltage
Single
Transverse/ differential
No
2.1.1a
3.1.1
4.1.1a
5.1.1a
Port to earth
No
2.1.1b
n/a
4.1.1b
5.1.1b
Port to external port
No
2.1.1c
n/a
4.1.1c
5.1.1c
Coordination/ Transverse/ differential
Yes
2.1.2a
3.1.2
4.1.2a
5.1.2a
Coordination/ Port to earth
Yes
2.1.2b
n/a
4.1.2b
5.1.2b
Coordination/ Port to external port
Yes
2.1.2c
n/a
4.1.2c
5.1.2c
Multiple
Port to earth
No
2.1.3a
n/a
n/a
n/a
Port to external port
No
2.1.3b
n/a
n/a
n/a
Port to earth
Yes
2.1.4a
n/a
n/a
n/a
Port to external port
Yes
2.1.4b
n/a
n/a
n/a
Ethernet unshielded twisted pair (UTPE)
Port to earth
No
2.1.8
n/a
n/a
n/a
Transverse/ differential
No
2.1.7
n/a
n/a
n/a
Voltage impulse test
No
2.1.10
n/a
n/a
n/a
Power over Ethernet (PoE)
No
2.1.11
n/a
n/a
n/a
Ethernet shielded twisted pair
(STPE)
Shield to earth
No
2.1.9

n/a
n/a
Port to earth
No
2.1.8

n/a
n/a
Test type
No. of pairs simultaneously tested
Test connections
Primary protection
Port type
Symmetric port
Co- axial port
Dedicated power feed port
Mains power port
Lightning current
Single
Port to earth
No
2.1.5a
n/a
4.1.5a
n/a
Port to external port
No
2.1.5b
n/a
4.1.5b
n/a
Multiple
Port to earth
No
2.1.6a, 2.1.10
n/a
n/a
n/a
Port to external port
No
2.1.6b
n/a
n/a
n/a
Transverse/differential
n/a
n/a
3.1.3
n/a
n/a
Shield to earth
n/a
n/a
3.1.4
n/a
n/a
Shield to external port
n/a
n/a
3.1.5
n/a
n/a
Power induction and earth potential rise
Single
Transverse/differential
No
2.2.1a
Under study
4.2.1a
n/a
Port to earth
No
2.2.1b
n/a
4.2.1b
5.2.1
under study
Port to external port
No
2.2.1c
n/a
4.2.1c
5.2.1
under study
Coordination Transverse/differential
Yes
2.2.2a
Under study
4.2.2a
n/a
Coordination port to earth
Yes
2.2.2b
n/a
4.2.2b
n/a
Coordination port to external port
Yes
2.2.2c
n/a
4.2.2c
n/a
Neutral potential rise
Single
Port to earth
No
n/a
n/a
n/a
5.2.2a
Port to external port
No
n/a
n/a
n/a
5.2.2b
Mains power contact
Single
Transverse/differential
No
2.3.1a
n/a
4.3.1a
n/a
Port to earth
No
2.3.1b
n/a
4.3.1b
n/a
Port to external port
No
2.3.1c
n/a
4.3.1c
n/a
Ethernet port
No
2.4



n/a        not applicable.

-Lightning test conditions for ports connected to internal cables 连接到内部电缆的端口的雷电测试条件

No. of pairs simultaneously tested
Test connection
Primary protection
Unshielded cable
Shielded cable
PoE feed
DC
powered equipment
DC
power source
Single
Shielded cable to earth
No

7.2



USB shielded cable to earth
No

7.3



Screen/ shield connection high current test
No

7.4



Ethernet transverse/ differential
No
7.7
7.7



Twisted pair port transverse/ differential
No
7.10
7.10



DC powered equipment port
No



7.8

DC power source port
No




7.9
Multiple
Unshielded cable with symmetric pairs
No
7.1




PoE Mode A and Mode B transverse/ differential testing
No


7.5


Ethernet longitudinal/commo n mode withstand test
No
7.6




连接到外部对称对电缆的端口的雷电测试条件-Lightning test conditions for ports connected to external symmetric pair cables
Test No.

Test description
Test circuit and waveform
(see figures in Annex A of [ITU-T K.44])
Basic test levels (also see clause 7 of
[ITU-T K.44])
Enhanced test levels (also see clauses 5 and 7 of
[ITU-T K.44])

Number of tests
Primary protection (see clause 8 of
[ITU-T K.44])
Acceptance criteria
(see clause 9 of [ITU-T K.44])


Comments
2.1.1a
Single pair, lightning, inherent, transverse/ differential
A.3-1 and A.6.1-1
(a and b) 10/700
Uc(max) = 1.5 kV
R = 25 W
Uc(max) = 1.5 kV
R = 25 W
Alternating
±5 surges
(60 s between successive surges)
None
A
Test 2.1.1 does not apply when the equipment is designed to always be used with primary protection and the operator agrees. If this test is not performed, the appropriate test from Table 7 applies.
If the inherent protection of the port under test contains surge protective devices (SPDs) that are connected to a protective earth (PE), a Uc(max) of 1.5 kV shall be used instead of 6 kV.
If the equipment has an insulated case, the 6 kV test is applied with the equipment wrapped in conductive foil and the foil is connected to the generator return.
When the equipment contains high current- carrying components that eliminate the need for primary protection, this test does not apply.
(Lower voltage level testing also required for each test – see clause 7.3 of
[ITU-T K.44].)
2.1.1b
Single pair, lightning, inherent, port to earth
A.3-1 and A.6.1-2 10/700
Uc(max) = 1.5 kV
R = 25 W
Uc(max) = 6 kV See comments R = 25 W
2.1.1c
Single pair, lightning, inherent, port to external port
A.3-1 and A.6.1-3 10/700
Uc(max) = 1.5 kV
R = 25 W
Uc(max) = 6 kV See comments R = 25 W

连接到外部对称对电缆的端口的雷电测试条件-Lightning test conditions for ports connected to external symmetric pair cables
Test No.

Test description
Test circuit and waveform
(see figures in Annex A of [ITU-T K.44])
Basic test levels (also see clause 7 of
[ITU-T K.44])
Enhanced test levels (also see clauses 5 and 7 of
[ITU-T K.44])

Number of tests
Primary protection (see clause 8 of
[ITU-T K.44])
Acceptance criteria
(see clause 9 of [ITU-T K.44])


Comments
2.1.2a
Single pair, lightning, coordination, transverse/ differential
A.3-1 and A.6.1-1
(a and b) 10/700
Uc(max) = 4 kV
R = 25 W
Uc(max) = 6 kV
R = 25 W
Alternating
±5 surges
(60 s between successive surges)
Special test protector (STP); see clause 8.4 of [ITU-T K.44].
When performing the external port to external port test, also add an STP/ primary protector to the untested port.
A
When the test is performed with Uc = Uc(max), the STP must operate. It may also operate with a voltage of Uc < Uc(max)
When the equipment contains high
current-carrying components that eliminate the need for primary protection, refer to clause 10.1.1 of
[ITU-T K.44].
(Lower voltage level testing also required for each test – see clause 7.3 of
[ITU-T K.44].)
2.1.2b
Single pair, lightning, coordination, port to earth
A.3-1 and A.6.1-2 10/700
Uc(max) = 4 kV
R = 25 W
Uc(max) = 6 kV
R = 25 W
2.1.2c
Single pair, lightning, coordination, port to external port
A.3-1 and A.6.1-3 10/700
Uc(max) = 4 kV
R = 25 W
Uc(max) = 6 kV
R = 25 W
2.1.3a
Multiple pair, lightning, inherent, port to earth
A.3-1 and A.6.1-4 10/700
Uc(max) = 1.5 kV
R = 25 W
Uc(max) = 1.5 kV
R = 25 W
Alternating
±5 surges
(60 s between successive surges)
None
A
The multiple pairs test is simultaneously applied to 100% of the pairs in the same street cable, but limited to a maximum of eight pairs. This test does not apply when the equipment is designed to be always used with primary protection. When the equipment contains high current-carrying components that eliminate the need for primary protection, this test does not apply.
2.1.3b
Multiple pair, lightning, inherent, port to external port
A.3-1 and A.6.1-5 10/700
Uc(max) = 1.5 kV
R = 25 W
Uc(max) = 1.5 kV
R = 25 W
Test No.

Test description
Test circuit and waveform
(see figures in Annex A of [ITU-T K.44])
Basic test levels (also see clause 7 of
[ITU-T K.44])
Enhanced test levels (also see clauses 5 and 7 of
[ITU-T K.44])

Number of tests
Primary protection (see clause 8 of
[ITU-T K.44])
Acceptance criteria
(see clause 9 of [ITU-T K.44])


Comments
2.1.4a
Multiple pair, lightning, port to earth
A.3-1 and A.6.1-4 10/700
Uc(max) = 4 kV
R = 25 W
Uc(max) = 6 kV
R = 25 W
Alternating
±5 surges
(60 s between successive surges)
Agreed primary protector. When performing the external port to external port test, also add an STP/ primary protector to the untested port.
A
The multiple pairs test is simultaneously applied to 100% of the pairs in the same street cable, but limited to a maximum of eight pairs.
When the equipment contains high
current-carrying components that eliminate the need for primary protection, do not remove these components and do not add primary protection.
(Lower voltage level testing also required for each test – see clause 7.3 of
[ITU-T K.44].)
2.1.4b
Multiple pair, lightning, port to external port
A.3-1 and A.6.1-5 10/700
Uc(max) = 4 kV
R = 25 W
Uc(max) = 6 kV
R = 25 W

Test No.

Test description
Test circuit and waveform
(see figures in Annex A of [ITU-T K.44])
Basic test levels (also see clause 7 of
[ITU-T K.44])
Enhanced test levels (also see clauses 5 and 7 of
[ITU-T K.44])

Number of tests
Primary protection (see clause 8 of
[ITU-T K.44])
Acceptance criteria
(see clause 9 of [ITU-T K.44])


Comments
2.1.5a
Single pair, lightning current, port to earth
A.3-4 and A.6.1-2 8/20
I = 1 kA/wire
R = 0 W
I = 5 kA/wire
R = 0 W
Alternating
±5 surges
(60 s between successive surges)
None
A
This test only applies when the equipment contains high current-carrying components that eliminate the need for primary protection. Do not remove these components.
The multiple pairs test is simultaneously applied to 100% of the pairs in the same street cable, but limited to a maximum of eight pairs.
2.1.5b
Single pair, lightning current, port to external port
A.3-4 and A.6.1-3 8/20
I = 1 kA/wire
R = 0 W
I = 5 kA/wire
R = 0 W
2.1.6a
Multiple pair, lightning current, port to earth
A.3-4 and A.6.1-4 8/20
I = 1 kA/wire Limited to 6 kA total
R = 0 W
I = 5 kA/wire Limited to 30 kA total
R = 0 W
Alternating
±5 surges
(60 s between successive surges)
None
A
2.1.6b
Multiple pair, lightning current, port to external port
A.3-4 and A.6.1-5 8/20
I = 1 kA/wire Limited to 6 kA total (Note 1)
R = 0 W
I = 5 kA/wire Limited to 30 kA total (Note 1)
R = 0 W
2.1.7
Ethernet transverse/ differential
A.3-5 and A.6.7-5 1.2/50-8/20
combination wave
generator (CWG)
R1 = 10 Ω and
R2 = 10 Ω
Uc(max) = 2 500 V
Uc(max) = 6 000 V
Alternating
±5 surges
(60 s between successive surges)
None
A
Test No.

Test description
Test circuit and waveform
(see figures in Annex A of [ITU-T K.44])
Basic test levels (also see clause 7 of
[ITU-T K.44])
Enhanced test levels (also see clauses 5 and 7 of
[ITU-T K.44])

Number of tests
Primary protection (see clause 8 of
[ITU-T K.44])
Acceptance criteria
(see clause 9 of [ITU-T K.44])


Comments
2.1.8
Ethernet longitudinal/ common mode to transverse/ differential mode conversion tests
A.3-5 and A.6.7-4 1.2/50-8/20 CWG R = 10 Ω
Uc(max) = 2 500 V
Uc(max) = 6 000 V
Alternating
±5 surges
(60 s between successive surges)
None
A

2.1.9
Screen/shield connection high current test
A.3-5 and A.6.7-6 1.2/50-8/20 CWG R = 5 Ω
Uc(max) = 2 500 V
Uc(max) = 6 000 V
Alternating
±5 surges
(60 s between successive surges)
None (see Note 2)
A

2.1.10
UTPE port rated impulse voltage test
A.3-5 and A.6.7-3a 1.2/50-8/20 CWG R = 5 Ω
Uc(max) = 2 500 V surge
Uc(max) = 6 000 V surge
Alternating
±5 surges
(60 s between successive surges)
None (Note 2)
A
There shall be no insulation breakdown during the test and the post-test resistance shall be at least 2 MΩ when measured at 500 V d.c.;
see Figure A.6.7-3. Monitor the impulse voltage to detect insulation breakdown or voltage protector operation.
2.1.11
PoE Mode A and Mode B transverse/ differential test
A.3-5 and A.6.7-2 1.2/50-8/20 CWG
R1 = 10 Ω and
R2 = 10 Ω
Uc(max) = 2 500 V
Uc(max) = 6 000 V
Alternating
±5 surges
(60 s between successive surges)
None
A

NOTE 1 – Peak current is set by the weaker of the ports under test and the external port coupled to earth.
NOTE 2 – When the cabling is fitted with SPDs, the equipment user and manufacturer may use different test conditions upon mutual agreement; this topic is currently under study.
I: current; R: resistance; Uc(max): maximum charging voltage.

连接到外部对称对电缆的端口的电源感应和接地电位上升测试条件 - Power induction and earth potential rise test conditions for ports connected to external symmetric pair cables
Test No.

Test description
Test circuit (see figures in Annex A of [ITU-T K.44])
Basic test levels (also see clause 7 of
[ITU-T K.44])
Enhanced test levels (also see clauses 5 and 7 of
[ITU-T K.44])

Number of tests
Primary protection
(see clause 8 of [ITU-T K.44])
Acceptance criteria
(see clause 9 of [ITU-T K.44])

Comments
2.2.1a
Power induction, inherent, transverse/
differential
A.3-6 and A.6.1-1
(a and b)
Wsp(max) = 0.2 A2s  f = 16⅔ Hz, 50 Hz or 60 Hz
Ua.c.(max) = 600 V
R = 600 W
t = 0.2 s
Wsp(max) = 0.2 A2s
f = 16⅔ Hz, 50 Hz or 60 Hz
Ua.c.(max) = 600 V
R = 600 W
t = 0.2 s
5
None
A
This test does not apply when the equipment is designed to be always used with primary protection and the operator agrees.
When the equipment contains high current- carrying components that eliminate the need for primary protection, this test does not apply.
2.2.1b
Power induction and earth potential rise, inherent,
port to earth
A.3-6 and A.6.1-2
2.2.1c
Power induction and earth potential rise, inherent,
port to external port
A.3-6 and A.6.1-3
2.2.2a
Power induction inherent/ coordination, transverse/ differential
A.3-6 and A.6.1-1
(a and b)
Wsp(max) = 1 A2s
f = 16⅔ Hz, 50 Hz or 60 Hz
Ua.c.(max) = 600 V
R = 600 W
t = 1.0 s (Note 1)
Wsp(max) = 10 A2s
f = 16⅔ Hz, 50 Hz or 60 Hz
Ua.c.(max) = 1 500 V
R = 200 W
t(max)  = 2 s
Wsp ´ R 2
t =  (U        )2        (6-1)
a.c.
(Note 2)
5
Special test protector (STP); see clause 8.4 of [ITU-T K.44].
When performing the external port to external port test, also add an STP/primary protector to the untested port.
A
If the equipment port has inherent primary protection, which eliminates the need for external primary protection, refer to clause 10.1.3 of
[ITU-T K.44].
2.2.2b
Power induction and earth potential rise, inherent/ coordination,
port to earth
A.3-6 and A.6.1-2
2.2.2c
Power induction and earth potential rise, inherent/ coordination,
port to external earth
A.3-6 and A.6.1-3

Test No.

Test description
Test circuit (see figures in Annex A of [ITU-T K.44])
Basic test levels (also see clause 7 of
[ITU-T K.44])
Enhanced test levels (also see clauses 5 and 7 of
[ITU-T K.44])

Number of tests
Primary protection
(see clause 8 of [ITU-T K.44])
Acceptance criteria
(see clause 9 of [ITU-T K.44])

Comments
2.3.1a
Mains power contact, inherent, transverse/ differential
A.3-6 and A.6.1-1
(a and b)
Ua.c. = 230 V
f = 50 Hz
t = 15 min for each test resistor R = 10 W, 20 W,
40 W, 80 W,
160 W, 300 W,
600 W and
1 000 W
See acceptance criteria column.
Ua.c. = 230 V
f = 50 Hz
t = 15 min for each test resistor
R = 10 W, 20 W, 40 W,
80 W, 160 W, 300 W,
600 W and 1 000 W See acceptance criteria column.
1
None
For basic level: criterion B.
For enhanced level: criterion A for test resistors 160 W, 300 W,
600 W, and
1 000 W;
criterion B for the other resistor values.
In some situations, the test may be performed with a reduced number of current limit resistors. Refer to
item 11, clause 7.2 of [ITU-T K.44] and
clause I.1.4 of [ITU-T K.44] for
guidance on selecting the necessary size of resistors.
When the equipment is designed to be always used with primary protection, and the operator agrees, perform this test with the STP installed. (Note 3)
If the equipment port has inherent primary protection, which eliminates the need for external primary protection, refer to clause 10.1.4 of
[ITU-T K.44].
2.3.1b
Mains power contact, inherent, port to earth
A.3-6 and A.6.1-2
2.3.1c
Mains power contact, inherent,
port to external port
A.3-6 and A.6.1-3
2.4
Ethernet port DC insulation resistance
A.6.7-3
UDC = ±500 V DC
UDC = ±500 V DC
2
None
Insulation resistance
> 2 MW
Test in both polarities, Ensures no port to earth conduction up to 350 V AC

Test No.

Test description
Test circuit (see figures in Annex A of [ITU-T K.44])
Basic test levels (also see clause 7 of
[ITU-T K.44])
Enhanced test levels (also see clauses 5 and 7 of
[ITU-T K.44])

Number of tests
Primary protection
(see clause 8 of [ITU-T K.44])
Acceptance criteria
(see clause 9 of [ITU-T K.44])

Comments
NOTE 1 – The test conditions for Test 2.2.2 (basic test level) may be adapted to the local conditions, by variation of the test parameters within the following limits, so that
I2t = 1 A2s is fulfilled:
Ua.c.(max) = 300 V... 600 V, selected to meet local conditions;
t £ 1.0 s, selected to meet local conditions;
R £ 600 Ω, is to be calculated according to Equation 6-2:
R = Ua.c.(max)√t        (6-2)
NOTE 2 – For Test 2.2.2 (enhanced test level), the equipment shall comply with the specified criterion for all voltage–duration combinations bounded (on and below) by the 10 A2s voltage–duration curve in Figure 1. The curve in Figure 1 is defined by Equation 6-1 and the boundary conditions in this table.
NOTE 3 – The a.c. mains voltage and frequency for Test 2.3.1 may be changed to the local mains supply voltage and frequency values. For a.c. test voltage values other than 230 V, the test resistor values should be adjusted to provide the same prospective short-circuit current values that occur in the 230 V test condition.
t: duration; Ua.c.: alternating current voltage; Ua.c.(max): maximum alternating current voltage; Wsp(max) maximum specific energy; f: frequency

连接到外部同轴电缆的端口的雷电测试条件-Lightning test conditions for ports connected to external coaxial cables
Test No.

Test description
Test circuit and waveform
(see figures in Annex A of [ITU-T K.44])

Basic test levels (also see clause 7 of [ITU-T K.44])
Enhanced test levels (also see clauses 5 and 7 of
[ITU-T K.44])

Number of tests
Primary protection
(see clause 8 of [ITU-T K.44])
Acceptance criteria
(see clause 9 of [ITU-T K.44])


Comments
3.1.1
Lightning, inherent, transverse/ differential
A.3-5 and A.6.2-1 1.2/50 – 8/20 CWG
Uc(max) = 1.0 kV
R = 0 W
Uc(max) = 1.5 kV
R = 0 W
Alternating
±5 surges
(60 s
between successive surges)
None
A
This test does not apply when the equipment is designed to be always used with primary protection.
When the equipment contains high current- carrying components that eliminate the need for primary protection, this test does not apply.








(Lower voltage level testing also required – see
clause 7.3 of [ITU-T K.44].)
3.1.2
Lightning, coordination, transverse/ differential
A.3.5 and A.6.2-1
1.2/50 – 8/20
CWG
Uc(max) = 4 kV
R = 0 W
Uc(max) = 6 kV
R = 0 W
Alternating
±5 surges
(60 s
between successive surges)
Special test protector (STP); see clause 8.4
of [ITU-T K.44].
When performing the external port to external port test, also add an STP/primary protector to the untested port.
A
When the test is performed with Uc = Uc(max), the STP must operate. It may also operate with a voltage of Uc < Uc(max)
When the equipment contains high current- carrying components that eliminate the need for primary protection, refer to clause 10.2 of [ITU-T K.44].
(Lower voltage level testing also required – see
clause 7.3 of [ITU-T K.44].)
3.1.3
Lightning,
A.3.4 and
I = 1 kA
I = 5 kA
Alternating
None
A
This test only applies when

current,
A.6.2-1


±5 surges


the equipment contains high

transverse/
8/20


(60 s


current-carrying components

differential



between


that eliminate the need for





successive


primary protection. Do not





surges)


remove these components.


Test No.

Test description
Test circuit and waveform
(see figures in Annex A of [ITU-T K.44])

Basic test levels (also see clause 7 of [ITU-T K.44])
Enhanced test levels (also see clauses 5 and 7 of
[ITU-T K.44])

Number of tests
Primary protection
(see clause 8 of [ITU-T K.44])
Acceptance criteria
(see clause 9 of [ITU-T K.44])


Comments
3.1.4
Lightning shield test, port to earth
A.3.4 and A.6.2-2
8/20
I = 4 kA (Note 1)
I = 2 kA (Note 2)
I = 20 kA (Note 1)
I = 5 kA (Note 2)
Alternating
±5 surges
(60 s
between successive surges)
STP;
see clause 8.4 of [ITU-T K.44].
When performing the external port to external port test, also add an STP/primary protector to the untested port.
A
Only applies to earthed equipment and equipment without isolation capacitors in the coaxial cable path.
3.1.5
Lightning shield test, port to external port
A.3.4 and A.6.2-3
8/20
I = 4 kA (Note 1)
I = 2 kA (Note 2)
I = 20 kA (Note 1)
I = 5 kA (Note 2)
Alternating
±5 surges
(60 s
between successive surges)
STP;
see clause 8.4 of [ITU-T K.44].
When performing the external port to external port test, also add an STP/primary protector to the untested port.
A
Only applies to earthed equipment and equipment without isolation capacitors in the coaxial cable path.
NOTE 1 – Equipment designed to be connected to antennas or equipment exposed to direct lightning currents, e.g., connected to antennas or equipment mounted on a tower. NOTE 2 – Applicable equipment not covered by Note 1.

连接到外部直流或交流专用馈电电缆的端口的雷电测试条件-Lightning test conditions for ports connected to external d.c. or a.c. dedicated power feeding cables
Test No.

Test description
Test circuit and waveform (see figures in Annex A of [ITU-T K.44])
Basic test levels (also see clause 7 of
[ITU-T K.44])
Enhanced test levels
(also see clauses 5 and 7 of [ITU-T K.44])

Number of tests
Primary protection
(see clause 9 of [ITU-T K.44])
Acceptance criteria
(see clause 9 of [ITU-T K.44])


Comments
4.1.1a
Single pair, lightning, inherent, transverse/ differential
A.3-1 and A.6.3-1
(a and b) 10/700
Uc(max) = 1.5 kV
R = 25 W
Uc(max) = 1.5 kV
R = 25 W
Alternating ±5
surges (60 s between successive surges)
None
A
Test 4.1.1 does not apply when the equipment is designed to be always used with primary protection and the operator agrees. If this test is not performed, the appropriate test from Table 7 applies.
If the inherent protection of the port under test contains SPDs that are connected to earth, a Uc(max) of
1.5 kV shall be used instead of 6 kV.
If the equipment has an insulated case, the 6 kV test is applied with the equipment wrapped in conductive foil and the foil is connected to the generator return.
When the equipment contains high current-carrying components that eliminate the need for primary protection, this test does not apply.
(Lower voltage level testing also required for each test – see clause 7.3 of [ITU-T K.44].)
4.1.1b
Single pair, lightning, inherent, port to earth
A.3-1 and A.6.3-2 10/700
Uc(max) = 1.5 kV
R = 25 W
Uc(max) = 6 kV
R = 25 W
4.1.1c
Single pair, lightning, inherent, port to external port
A.3-1 and A.6.3-3 10/700
Uc(max) = 1.5 kV
R = 25 W
Uc(max) = 6 kV
R = 25 W
Test No.

Test description
Test circuit and waveform (see figures in Annex A of [ITU-T K.44])
Basic test levels (also see clause 7 of
[ITU-T K.44])
Enhanced test levels
(also see clauses 5 and 7 of [ITU-T K.44])

Number of tests
Primary protection
(see clause 9 of [ITU-T K.44])
Acceptance criteria
(see clause 9 of [ITU-T K.44])


Comments
4.1.2a
Single pair, lightning, coordination, transverse/ differential
A.3-1 and A.6.3-1
(a and b) 10/700
Uc(max) = 4 kV
R = 25 W
Uc(max) = 6 kV
R = 25 W
Alternating ±5
surges (60 s between successive surges)
Special test protector (STP); see clause 8.4 of [ITU-T K.44].
When performing the external port to external port test, also add an STP/
primary protector to the untested port.
A (Note)
When the test is performed with Uc = Uc(max), the STP must operate. It may also operate with a voltage of
Uc < Uc(max)
When the equipment contains high current-carrying components that eliminate the need for primary protection, do not remove these components and do not add primary protection. During the test, this protection must operate at
Uc = Uc(max).
If the primary protector is a clamping type device, use the test circuit and test levels specified in Test 4.1.5.
(Lower voltage level testing also required – see clause 7.3 of [ITU-T K.44].)
4.1.2b
Single pair, lightning, coordination, port to earth
A.3-1 and A.6.3-2 10/700
Uc(max) = 4 kV
R = 25 W
Uc(max) = 6 kV
R = 25 W
4.1.2c
Single pair, lightning, coordination, port to external port
A.3-1 and A.6.3-3 10/700
Uc(max) = 4 kV
R = 25 W
Uc(max) = 6 kV
R = 25 W
4.1.3
Multiple pair, lightning, inherent, port to earth and port to external port

n/a
n/a




4.1.4
Multiple pair, lightning, port to earth and port to external port

n/a
n/a



Test No.
Test description
Test circuit and waveform (see figures in Annex A of [ITU-T K.44])
Basic test levels (also see clause 7 of
[ITU-T K.44])
Enhanced test levels
(also see clauses 5 and 7 of [ITU-T K.44])
Number of tests
Primary protection
(see clause 9 of [ITU-T K.44])
Acceptance criteria
(see clause 9 of [ITU-T K.44])
Comments
4.1.5a
Single pair, lightning current, port to earth
A.3-4 and A.6.3-2 8/20
I = 1 kA/wire
R = 0 W
I = 5 kA/wire
R = 0 W
Alternating ±5
surges (60 s between successive surges)
None
A
This test only applies when the equipment contains high
current-carrying components that eliminate the need for primary protection. Do not remove these components.
4.1.5b
Single pair, lightning current, port to external port
A.3-4 and A.6.3-3 8/20
I = 1 kA/wire
R = 0 W
I = 5 kA/wire
R = 0 W
4.1.6
Multiple pair, lightning current
n/a
n/a
NOTE – As there is little knowledge of the agreed primary protector, it is not possible to give guidance. In the interim, test conditions for symmetric pair ports have been provided.

连接到外部直流或交流专用馈电电缆的端口的功率感应和接地电位升高测试条件- Power induction and earth potential rise test conditions for ports connected to external d.c. or a.c. dedicated power feeding cables

Test No.

Test description
Test circuit (see figures
in Annex A of [ITU-T K.44])
Basic test levels (also see clause 7 of [ITU-T K.44])
Enhanced test levels (also see clauses 5 and 7 of
[ITU-T K.44])

Number of tests
Primary protection
(see clause 8 of [ITU-T K.44])
Acceptance criteria
(see clause 9 of [ITU-T K.44])

Comments
4.2.1a
Power induction, inherent, transverse/ differential
A.3-6 and A.6.3-1
(a and b)
Wsp(max) = 0.2 A2s  f = 16⅔ Hz, 50 Hz or 60 Hz
Ua.c.(max) = 600 V
R = 600 W
t = 0.2 s
Wsp(max)  = 0.2 A2s
f = 16⅔ Hz, 50 Hz or 60 Hz Ua.c.(max)  = 600 V
R = 600 W
t = 0.2 s
5
None
A
This test does not apply when the equipment is designed to be always used with primary protection and the operator agrees.
When the equipment contains high current-carrying components that eliminate the need for primary protection, this test does not apply.
4.2.1b
Power induction and earth potential rise, inherent, port to earth
A.3-6 and A.6.3-2
4.2.1c
Power induction and earth potential rise, inherent, port to external port
A.3-6 and A.6.3-3
4.2.2a
Power induction, inherent/ coordination, transverse/ differential
A.3-6 and A.6.3-1
(a and b)
Wsp(max) = 1 A2s
f = 16⅔ Hz, 50 Hz or 60 Hz
Ua.c.(max) = 600 V
R = 600 W
t = 1.0 s (Note 1)
Wsp(max)  = 10 A2s
f = 16⅔ Hz, 50 Hz or 60 Hz
Ua.c.(max) = 1 500 V
R = 200 W
t(max)  = 2 s
Wsp ´ R 2
t =  (U        )2        (6-1)
a.c.
(Note 2)
5
Special test protector (STP); see clause 8.4 of [ITU-T K.44].
When performing the external port to external port test, also add an STP/primary protector to the untested port.
A
When the equipment contains high current-carrying components that eliminate the need for primary protection, do not remove these components and do not add primary protection.
4.2.2b
Power induction and earth potential rise, inherent/ coordination, port to earth
A.3-6 and A.6.3-2
4.2.2c
Power induction and earth potential rise, inherent/
coordination,
A.3-6 and A.6.3-3





Test No.

Test description
Test circuit (see figures
in Annex A of [ITU-T K.44])
Basic test levels (also see clause 7 of [ITU-T K.44])
Enhanced test levels (also see clauses 5 and 7 of
[ITU-T K.44])

Number of tests
Primary protection
(see clause 8 of [ITU-T K.44])
Acceptance criteria
(see clause 9 of [ITU-T K.44])

Comments

port to external port







4.3.1a
Mains power contact, inherent, transverse/ differential
A.3-6 and A.6.3-1
(a and b)
Ua.c. = 230 V
f = 50 Hz
t = 15 min for each test resistor R = 10 W, 20 W,
40 W, 80 W,
160 W, 300 W,
600 W and
1 000 W
See acceptance criteria column.
(Note 3)
Ua.c. = 230 V
f = 50 Hz
t = 15 min for each test resistor
R = 10 W, 20 W, 40 W,
80 W, 160 W, 300 W,
600 W and 1 000W See acceptance criteria column.
(Note 3)
1
None
For basic level: criterion B.
For enhanced level: criterion A for test resistors 160 W, 300 W,
600 W and
1 000 W;
criterion B for the other resistor values.
In some situations, the test may be performed with a reduced number of current limit resistors. Refer to
item 11, clauses 7.2 and I.1.4 of [ITU-T K.44] for guidance on selecting the necessary size of resistors. When the equipment is designed to be always used with primary protection, and the operator agrees, perform this test with the STP installed.
4.3.1b
Mains power contact, inherent, port to earth
A.3-6 and A.6.3-2
4.3.1c
Mains power contact, inherent, port to external port
A.3-6 and A.6.3-3
NOTE 1 – The test conditions for Test 4.2.2 (basic test level) may be adapted to the local conditions, by variation of the test parameters within the following limits, so that
I2t = 1 A2s is fulfilled:
Ua.c.(max) = 300 V... 600 V, selected to meet local conditions;
t £ 1.0 s, selected to meet local conditions;
R £ 600 W, is to be calculated according to Equation 6-2:
R = Ua.c.(max)√t        (6-2)
NOTE 2 – For Test 4.2.2 (enhanced test level), the equipment shall comply with the specified criterion for all voltage–duration combinations bounded (on and below) by the 10 A2s voltage–duration curve in Figure 1. The curve in Figure 1 is defined by Equation 6-1 and the boundary conditions in this table.
NOTE 3 – The a.c. mains voltage and frequency for Test 4.3.1 may be changed to the local mains supply voltage and frequency values. For a.c. test voltage values other than 230 V, the test resistor values should be adjusted to provide the same prospective short-circuit current values that occur in the 230 V test condition.

电源端口的测试条件-Test conditions for mains power ports

Test No.


Test description
Test circuit and waveform
(see figures in
Annex A of [ITU-T K.44])
Basic test levels (also see clause 7 of
[ITU-T K.44])
(Note 1)
Enhanced test levels (also see clauses 5 and 7 of
[ITU-T K.44])
(Note 1)


Number of tests
Primary protection (see clause 8 of [ITU-T
K.44])
Acceptance criteria (see clause 9 of [ITU-
T K.44])


Comments
5.1.1a
Lightning, inherent, transverse/ differential
A.3-5 and A.6.4-1 1.2/50-8/20 CWG
Uc(max) = 2.5 kV
R = 0 W
Uc(max) = 6.0 kV
R = 0 W
Alternating
±5 surges
(60 s)
between successive surges)
None
A
This test does not apply when the equipment is designed to be always used with primary protection and the operator agrees.
(Lower voltage level testing also required – see clause 7.3 of [ITU-T K.44].)
5.1.1b
Lightning, inherent, port to earth
A.3-5 and A.6.4-2 1.2/50-8/20 CWG
Uc(max) = 2.5 kV
R = 0 W
Uc(max) = 6.0 kV
R = 0 W
5.1.1c
Lightning, inherent, port to external port
A.3-5 and A.6.4-3 1.2/50-8/20
CWG
Uc(max) = 2.5 kV
R = 0 W
Uc(max) = 6.0 kV
R = 0 W
5.1.2a
Lightning, inherent/ coordination, transverse/ differential
A.3-5 and A.6.4-1 1.2/50-8/20 CWG
Uc(max) = 6.0 kV
R = 0 W
Uc(max) = 10.0 kV
R = 0 W
Alternating
±5 surges
(60 s
between successive surges)
Agreed primary protector (mains)
(Note 2). When performing the
external port to
external port test, also add an STP/primary protector to the untested port.
A
(Lower voltage level testing also required – see clause 7.3 of [ITU-T K.44].)
5.1.2b
Lightning, inherent/ coordination, port to earth
A.3-5 and A.6.4-2 1.2/50-8/20 CWG
Uc(max) = 6.0 kV
R = 0 W
Uc(max) = 10.0 kV
R = 0 W
5.1.2c
Lightning, inherent/ coordination, port to external port
A.3-5 and A.6.4-3 1.2/50-8/20 CWG
Uc(max) = 6.0 kV
R = 0 W
Uc(max) = 10.0 kV
R = 0 W

Test No.


Test description
Test circuit and waveform
(see figures in
Annex A of [ITU-T K.44])
Basic test levels (also see clause 7 of
[ITU-T K.44])
(Note 1)
Enhanced test levels (also see clauses 5 and 7 of
[ITU-T K.44])
(Note 1)


Number of tests
Primary protection (see clause 8 of [ITU-T
K.44])
Acceptance criteria (see clause 9 of [ITU-
T K.44])


Comments
5.2.1
Earth potential rise
A.3-5 and A.6.4-1 1.2/50-8/20 CWG
Under study
Under study
5
None
A

5.2.2a
Neutral potential rise, inherent, port to earth
A.3-5 and A.6.4-2
a.c.
U(AC) = 600 V
f = 50 Hz or 60 Hz
t = 1 s
R = 200 W
U(AC) = 1 500 V
f = 50 Hz or 60 Hz
t = 1 s
R = 200 W
5
None
A
This test applies only when the equipment is to be installed with a TT or IT mains system and the operator requests it.
5.2.2b
Neutral potential rise, inherent, port to external port
A.3-5 for and A.6.4-3
a.c.
NOTE 1 – The tests in this table apply to both mains-powered equipment and the combination of portable power supplies and equipment for portable supply-powered equipment. NOTE 2 – The total lead length used to connect the agreed primary protector shall be 1 m.

表6-外壳静电放电试验条件-Table 6 – Test conditions for electrostatic discharge applied to the enclosure
Test No.

Test description

Test circuit

Basic test level
(Note)

Enhanced test level
(Note)

Number of tests

Primary protection
Acceptance criteria (see clause 9 of [ITU-T K.44])
6.1a
Air discharge
[IEC 61000-4-2]
Level 3 (8 kV)
Level 4 (15 kV)
5
n/a
A
6.1b
Contact discharge
[IEC 61000-4-2]
Level 3 (6 kV)
Level 4 (8 kV)
5
n/a
A
NOTE – The test applies to the equipment enclosure.


表7-连接到内部电缆的端口的雷电测试条件（正在研究短电缆的测试豁免）Table 7 – Lightning test conditions for ports connected to internal cables (Test exemptions for short cables are under study)

Test No.

Test description
(Note 1)
Test circuit and waveform
(see figures in Annex A of
[ITU-T K.44])

Basic test levels (also see clause 7 of [ITU-T K.44])

Enhanced test levels (also see clauses 5 and 7 of
[ITU-T K.44])


Number of tests

Primary protection
(see clause 8 of [ITU-T K.44])

Acceptance criteria
(see clause 9 of [ITU-T K.44])


Comments
7.1
Unshielded cable with symmetric pairs
A.3-5 and A.6.5-1 1.2/50-8/20 CWG R = 10 W
(The value of R is independent of the number of conductors)
Uc(max) = 1 kV
Uc(max) = 1.5 kV
Alternating ±5
surges (60 s between successive surges)
None
A
The test is applied simultaneously to all symmetric cable pairs connected to the equipment port under test except for unshielded Ethernet ports.








(Lower voltage level testing also required – see clause 7.3 of [ITU-T K.44].)
7.2
Shielded cable to earth
A.3-5 and A.6.5-2 1.2/50-8/20 CWG R = 0 W
The value of R is independent of the number of conductors
Uc(max) = 1 kV
Uc(max) = 1.5 kV
Alternating ±5
surges (60 s between successive surges)
None
A
(Lower voltage level testing also required – see clause 7.3 of [ITU-T K.44].)
7.3
USB shielded cable to earth
A.3-5 and A.6.5-2 1.2/50-8/20 CWG R = 0 W
Uc(max) = 100 V
Uc(max) = 150 V
Alternating ±5
surges (60 s between successive surges)
None
A
Test is performed with the supplied cable (not the 20 m cable specified in
Figure A.6.5-2).








(Lower voltage level testing also required – see clause 7.3 of [ITU-T K.44].)


表7-连接到内部电缆的端口的雷电测试条件（豁免见第6条注释5）Table 7 – Lightning test conditions for ports connected to internal cables (See clause 6, NOTE 5, for exemptions)
Test No.

Test description
Test circuit and waveform
(see figures in Annex A of [ITU-T K.44])
Basic test levels (also see clause 7 of
[ITU-T K.44])
Intermediate test levels (also see clause 7 of
[ITU-T K.44])
Enhanced test levels (also see clause 7 of [ITU-T K.44]

Number of tests
Primary protection (clause 8 of [ITU-T K.44])
Acceptance criteria (clause 9 of [ITU-T K.44])


Comments
7.4
Screen/ shield connection high current test
A.3-5 and A.6.7-6 1.2/50-8/20 CWG R = 5 Ω
Uc(max) = 2.5 kV
Uc(max) = 4.0 kV
Uc(max) = 6.0 kV
Alternating ±5
surges (60 s between successive surges)
None
A

7.5
PoE Mode A and Mode B transverse/ differential test
A.3-5 and A.6.7-2 1.2/50-8/20 CWG
R1 = 10 Ω and
R2 = 10 Ω
Uc(max) = 2.5 kV
Uc(max) = 4.0 kV
Uc(max) = 6.0 kV
Alternating ±5
surges (60 s between successive surges)
None
A

7.6
Ethernet longitudinal
/common mode withstand test
A.3-5 and A.6.7-3a 1.2/50-8/20 CWG R = 5 Ω
Uc(max) = 2.5 kV
Uc(max) = 4.0 kV
Uc(max) = 6.0 kV
Alternating
±5 surges
(60 s between successive surges)
None (Note 2)
A
There shall be no insulation breakdown during the test and the post-test resistance shall be at least 2 MΩ when measured at 500 V d.c.
(see Figure A.6.7-3). Monitor the impulse voltage to detect insulation breakdown or voltage protector operation.
7.7
Ethernet transverse/ differential
A.3-5 and A.6.7-5 1.2/50-8/20 CWG
Uc(max) = 2.5 kV
Uc(max)) = 4.0 kV
Uc(max) = 6.0 kV
Alternating
±5 surges
(60 s between successive surges)
None
A


表7-连接到内部电缆的端口的雷电测试条件（正在研究短电缆的测试豁免）-Table 7 – Lightning test conditions for ports connected to internal cables (Test exemptions for short cables are under study)
Test No.
Test description
(Note 1)
Test circuit and waveform
(see figures in Annex A of [ITU-T K.44])
Basic test levels (also see clause 7 of [ITU-T K.44])
Enhanced test levels (also see clauses 5 and 7 of
[ITU-T K.44])

Number of tests
Primary protection (see clause 8 of [ITU-T K.44])
Acceptance criteria
(see clause 9 of [ITU-T K.44])

Comments
7.8
DC powered equipment port
A.3-5 (1.2/50-8/20 CWG) and A.6.6-1a
Coupling element: 10 W + 9 µF in series
Uc(max) = 1 kV
Uc(max) = 1.5kV
Alternating ±5 surges
(60 s between successive surges)
None
A
See [ITU-T K.44]
clauses 7.1.1 and
10.5.3
7.9
DC power source port
A.3-5 (1.2/50-8/20 CWG) and A.6.6-1b
Coupling element: 10 W + 9 µF in series
Uc(max) = 1 kV
Uc(max) = 1.5kV
Alternating ±5 surges
(60 s between successive surges)
None
A
See [ITU-T K.44]
clauses 7.1.1 and
10.5.4
7.10
Twisted pair port transverse/ differential
A.3-5 and A.6.7-5 1.2/50-8/20 CWG
Uc(max) = 1 kV
Uc(max) = 1.5kV
Alternating ±5 surges
(60 s between successive surges)
None
A

NOTE 1 – For equipment without an earth connection, wrap the equipment in foil and connect the foil to the generator return.
NOTE 2 – When the cabling is fitted with SPDs, the equipment user and manufacturer may use different test conditions upon mutual agreement; this topic is currently under study.

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曾工 | 2022-7-2 16:41:39 | 显示全部楼层

Annex A Special resistibility requirements

Figure 1 – Test voltage versus duration to give 10A2 200ohm

Figure 1 – Test voltage versus duration to give 10A2 200ohm
附录A特殊电阻（电阻率）要求
在某些情况下，由于环境条件、国家法规、经济和技术考虑、安装标准或服务要求的可靠性，即使增强的电阻要求也不足以满足客户场所的要求。然后，网络运营商可以要求特殊的电阻要求。
当以下所有条件同时存在时，特殊电阻要求适用：
  • IT或TT电力系统；
  • 未按照[ITU-T K.66]安装接地和连接；
  • 当风险评估需要时，未按照[ITU-T K.66]安装初级保护；
  • 安装多服务电涌保护器（MSPD）有困难。
在这种情况下，网络运营商可能需要请求特殊的电阻要求，含测试说明和特殊电阻要求。建议按照指示修改[ITU-T K.44]第7条“测试条件”中描述的测试要求。

提供了在无法实现粘合时用于确保安全性和耐受性的特殊要求。
这些特殊要求是对增强型ITU-T K.21测试的补充，适用于带接地电涌保护器和不带接地电涌保护器的设备。
为了确保客户的安全，在没有适当接地和连接的情况下，设备应包含表A.2-1中给出的端口到端口隔离。为确保接地电涌保护器的安全，需要适当的接地和连接。

表A.2-1a–连接到外部对称对绞电缆的端口的特殊雷电测试条件
Test No.

Test description
Test circuit and waveform
(see [ITU-T K.44]
Annex A figures)
Special test levels (also see [ITU-T K.44] clauses 5 and 7)

Number of tests

Primary protection

Acceptance criteria

Comments
2.1.2a
Single port, lightning, coordination, transverse/ differential
A.3-1 and A.6.1-1
(a and b) 10/700
Uc(max) = 4 kV R = 25 W
R1 = 100 W
5 of each polarity
Special test protector;
see [ITU-T K.44]
clause 8.4.
A
When the test is performed with Uc
= Uc(max), the special test protector must operate. It may also operate with a voltage of Uc < Uc(max).
When the equipment contains high current- carrying components which eliminate the need for primary protection, refer to [ITU-T K.44] clause 10.1.1.
Ethernet port tests are under study. The STP earthing resistance R1 increased to 100 W simulates the condition that this test intends.
2.1.2b
Single port, lightning, coordination, port to earth
A.3-1 and A.6.1-2 10/700
Uc(max) = 13 kV R = 25 W
R1 = 100 W
2.1.2c
Single port, lightning, coordination, port to external port
A.3-1 and A.6.1-3 10/700
Uc(max) = 13 kV R = 25 W
R1 = 100 W

表A.2-1b-电源端口的特殊雷电测试条件
Test No.

Test description
Test circuit and waveform
(see [ITU-T K.44]
Annex A figures)
Special test levels (also see [ITU-T K.44] clauses 5 and 7)

Number of tests

Primary protection

Acceptance criteria

Comments
5.1.1a
Lightning, inherent, transverse/ differential
A.3-5 and A.6.4-1
combination wave generator
Uc(max) = 10 kV R = 0 W
5 of each polarity
None When
performing the
external port to symmetric pair port test, also add an STP/primary protector to the untested port. R1
= 100 W for the untested port.
A

5.1.1b
Lightning, inherent, port to earth
A.3-5 and A.6.4-2
combination wave generator
Uc(max) = 10 kV R = 0 W
5.1.1c
Lightning, inherent, port to external port
A.3-5 and A.6.4-3
combination wave generator
Uc(max) = 10 kV R = 0 W

表A.2-1c-连接到内部电缆的端口的特殊雷电测试条件
Test No.
Test description
Test circuit and waveform (see figures in Annex A)
Special test levels (also see clauses 5 and 7)
Number of tests
Primary protectio n
Acceptance criteria

Comments


Internal POTS line transverse/differential

5 of each polarity
None
A
Only applies to POTS ports.



7.1



Unshielded cable
Figures A.3-5 and A.6.1-1 (a and b)
Combination wave generator R = 2 W
Uc(max) = 4 kV (10 A2s) OR






Figures A.3-1 and A.6.1-1 (a and b) 10/700
R = 25 W, 300 V GDT
generator coupling, no STP

Uc(max) = 8 kV (10 A2s)




Test No.
Test description
Test circuit and waveform (see figures in Annex A)
Special test levels (also see clauses 5 and 7)
Number of tests
Primary protectio n
Acceptance criteria

Comments


Internal POTS line to earth Figures A.3-5 and A.6.5-1. Combination wave generator
R = 10 W
Figures A.3-1 and 6.5-1 10/700
R = 25 W

Uc(max) = 10 k V

AND
Uc(max) = 13 k V






7.2
Shielded cable port (includes coaxial cable ports)
Figures A.3-5 (Combination wave generator)
and A.6.5-2 R = 0 W

Uc(max) = 10 kV
Alternating ±5
surges (60 s between successive surges)


None


A

(Lower voltage level testing also required – see [ITU-T K.44] clause 7.3)
NOTE – For equipment without an earth connection, wrap the equipment in foil and connect the foil to the generator return.

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曾工 | 2022-7-2 16:49:16 | 显示全部楼层

小的开关电源适配器，做K.21应该做多少伏雷击呢？

Table 5 – Test conditions for mains power ports

Table 5 – Test conditions for mains power ports

Table 5 – Test conditions for mains power ports

Table 5 & Table 6– Test conditions for mains power ports

Table 5 & Table 6– Test conditions for mains power ports

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更多咨询可以联系曾工，电话：139 2899 3907（微信同号） 邮箱：xiangwei.zeng@gmail.com
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