Ethernet signal transmission interface circuit, method and network equipment

Abstract

The invention discloses an Ethernet signal transmission interface circuit, method and network equipment. The interface circuit comprises a first transmission network and an Ethernet interface, the first transmission network comprises a first differential line pair and an inductive signal transformer; the inductive signal transformer comprises a pulse transformer and a first common-mode transformer; two pins at the first end of the first common-mode transformer are respectively connected with a differential line in the first differential line pair, two pins at the second end of the first common-mode transformer are respectively connected with two ends of a first winding of the pulse transformer, two ends of the second winding of the pulse transformer are connected with the Ethernet interface; a first center tap is arranged at the first winding of the pulse transformer, and the first center tap is grounded through the first capacitor. The interface circuit can be applied to the POE transmission, and is capable of singly realizing the transmission of a pair of differential signals, the diversification circuit combined design can be performed according to the data receiving or transmission demand of each contact of the Ethernet interface, and the adaptability of the Ethernet interface can be enhanced.

Description

technical field [0001] The invention relates to the technical field of communication, and in particular designs an Ethernet signal transmission interface circuit, method and network equipment. Background technique [0002] POE (Power Over Ethernet) refers to the use of IP-based terminals (such as IP phones, wireless LAN access points AP, network cameras) without any changes to the existing Ethernet Cat. etc.) while transmitting data network signals, it can also provide DC power supply technology for such devices. POE is also known as a local area network-based power supply system (POL, Power over LAN) or Active Ethernet (Active Ethernet), sometimes referred to as Power over Ethernet, which uses existing standard Ethernet transmission cables to simultaneously transmit data and The latest standard specification of electrical power, and maintain compatibility with existing Ethernet systems and users. [0003] The current way of transmitting POE is mainly realized by an isolat...

AI Technical Summary

Problems solved by technology

However, because traditional signal transformers cannot be produced by pure factory automation, coils need to be wound manually, resulting in low output, high cost, and large components, which occupy a large area on the circuit board and inflexible wiring, which is not conducive to product miniaturization. , high output and high benefit development

In addition, when the network transmission requirements of a certain contact of the Ethernet interface have different transmission requirements from other contacts, the traditional signal transformer cannot change the transmission of individual contacts due to its integration

[0004] In recent years, with the rapid development of network technology, a capacitive signal transformer has appeared, which can be produced by factory automation. The circuit board layout is convenient and flexible, and the cost is much lower than that of traditional signal transformers. It adopts the discharge method instead of the isolation method. It can only be used for the transmission of only network signals, and cannot be applied to POE transmission, which cannot reflect its use value.

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