Dying gasp Is that when the system voltage of the system cannot meet the normal operation of the system, the system will automatically send a signal to the terminal, telling the tip that the ONU may not work properly, and the terminal will give a response to release the channel originally arranged for the ONU.
ONU system Dying gasp implementation principle: ONU master chip manufacturers when design chip will design a Dying gasp performance module in the chip (the voltage comparator), this module monitors the external input voltage to realize Dying gasp function, realize this function when the chip must be in normal operating state, and also need to send a certain length to the tip signal, so define the Dying gasp signal effective time, for the normal voltage of the chip cannot be less than the minimum operating voltage described in the specification. That is to say, the difference between the starting voltage of the monitoring point and the working voltage of the chip cannot be less than the Dying gasp signal time length.
Dying gasp It translates to “take a breath before death”, using the last bit of electricity to send out the last status information. A circuit consisting of two parts:
1. Large capacitor energy storage. When the external input is lost, the electric energy stored in the large capacitor is released to supply the whole system and take a breath, generally in a few ms time, generally controlled at more than 10ms in ONU equipment. The circuit is very simple —— large capacitor (electrolytic capacitor, capacity and the system power consumption and energy stabilization range related), diode, voltage comparator. The role of capacitor here is to store energy, the diode does continuous flow, the voltage comparator realizes voltage comparison trigger interrupt signal.
2. The main chip of ONU has an input pin to monitor the voltage comparator level. When the Dying gasp is triggered, the interrupt signal can be sent out, allowing the system to enter the state of “will”, and finally send a certain length of signal to the head terminal within a few ms
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