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Method lowering network port radiation, port impedance matching circuit and apparatus

An impedance matching circuit and port technology, applied in the field of communication, can solve the problems of limited range of RC parameters, relatively high signal quality requirements, high cost, etc., to solve the problem of network port RE exceeding the standard, without affecting signal quality, and low cost Effect

Inactive Publication Date: 2009-02-04
HUAWEI DEVICE (SHENZHEN) CO LTD
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  • Abstract
  • Description
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Problems solved by technology

[0009] However, during the implementation of the present invention, the inventors found at least the following problems in the prior art: Among them, the cost of schemes a and b is relatively expensive; the differential routing of scheme c has relatively high requirements for signal quality, and the value of the RC parameter The scope is quite limited; plan d cannot meet the requirements of EMC (Electromagnetic Compatibility, electromagnetic compatibility) test standards

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  • Method lowering network port radiation, port impedance matching circuit and apparatus
  • Method lowering network port radiation, port impedance matching circuit and apparatus

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Embodiment Construction

[0029] The embodiment of the present invention provides a method for reducing network port radiation, a port impedance matching circuit and equipment. The method for reducing network port radiation is used in the product design stage, which can be applied to different LSW schemes for extracting broadband noise and narrowband network port noise. The situation of noise can reduce the problem of excessive radiation from the product to the test stage, thereby avoiding the product revision that may be caused by the problem of excessive radiation, which in turn leads to the extension of the product development cycle and market access cycle.

[0030] Embodiment 1 of the present invention provides a port impedance matching circuit, which provides a port termination method, which can perform port impedance matching, so that the system has more stable electrical performance, especially better electromagnetic compatibility performance . The port impedance matching circuit is an improved ...

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Abstract

Embodiments of the invention disclose a method for reducing network port radiation, a port impedance matching circuit and a device. Wherein, the port impedance matching circuit includes a first resistor (RY1), a second resistor (RY2), a third resistor (RY3) and a first capacitor (CY1), one side of the first resistor is connected with a center tap of a network port transformer, and the other side thereof is connected with the first capacitor and the third resistor, one side of the second resistor is connected with an RJ45 idle wire, and the other side thereof is connected with the third resistor, one side of the first capacitor is connected with the first resistor and the third resistor, and the other side thereof is connected to the ground. The method for reducing network port radiation, the port impedance matching circuit and the device can solve the RE over standard problem of the network port caused by different LSW schemes with rather low costs and without influencing the quality of signals.

Description

technical field [0001] The invention relates to communication technology, in particular to a method for reducing network port radiation, a port impedance matching circuit and equipment. Background technique [0002] FE (Fast Ethernet, Fast Ethernet) ports (referred to as network ports) can generally be divided into unshielded FE ports and shielded FE ports. [0003] Unshielded FE ports (referred to as unshielded network ports) are widely used in communication and information electronic products. When the equipment under test (EUT) is performing radiation tests, the ports need to be connected with an external twisted pair or network cable to the auxiliary equipment (AE) and realize business interoperability, such as figure 1 As shown, while the LSW (LAN SWITCH, network port switch chip) in the EUT demodulates and processes the communication signal sent by the AE, it generates network port narrowband noise and broadband noise, for example, it will generate various harmonics a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/02H01R13/719
Inventor 狄伟艾柯刘晓松
Owner HUAWEI DEVICE (SHENZHEN) CO LTD
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