Circuit structure capable of realizing critical failure signal generation function on network communication terminal equipment

Abstract

The invention relates to a circuit structure capable of realizing a critical failure signal generation function based on a TL431 chip on network communication terminal equipment, wherein the TL431 chip comprises a reference terminal, a positive terminal and a negative terminal, and the circuit structure comprises a power supply module, a first resistance, a second resistance, a third resistance, a fourth resistance, a switch triode and a seventh resistance. Because a differential amplifier in the TL431 chip, an NPN triode and the circuit structure of a reference voltage source are skillfully used and the switch triode and the relative resistances in the periphery circuit are utilized, the circuit structure capable of realizing the critical failure signal generation function based on the TL431 chip on the network communication terminal equipment not only has simple and practical structure, but also has the advantages of low cost, stable and reliable work performance and wider application range, and establishes a solid foundation for the further development of network communication terminal products.

Description

technical field [0001] The present invention relates to the field of electronic technology, in particular to the field of electronic circuits of network communication equipment, and specifically refers to a circuit structure based on a TL431 chip on a network communication terminal equipment to realize the function of generating Dying Gasp signals. Background technique [0002] In network communication terminal products, the fatal failure (Dying Gasp) signal refers to: when the system input voltage cannot meet the normal operation of the system, the system will automatically send a signal to the central office to tell the central office that the customer end equipment (CPE) voltage If it is too low to work normally, the local end responds accordingly and releases the channel originally allocated to the CPE. [0003] The Dying Gasp function is a must-have function on communication terminal products such as DSL / VDSL at present. The commonly used system Dyinggasp implementatio...

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Problems solved by technology

[0004] At present, the general design for realizing the Dying Gasp function is realized by using the 708S / R series reset monitoring chip, but this will increase the complexity and cost of the chip design, and the application range is limited to a certain extent, so it cannot be better large-scale application of

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