Method for node device to enter or exit power-saving mode and node device

A method for a node device to enter and exit a power-saving mode, comprising:

• the node device detecting characteristics of a reverse power supply signal provided by a customer premise equipment, and if the characteristics of the reverse power supply signal satisfy a condition of entering a power-saving mode, the node device entering the power-saving mode;
• wherein the reverse power supply signal provided by the customer premise equipment is used to provide reverse power supply to the node device;
• wherein the characteristics of the reverse power supply signal comprise one or more of a current level, a power level, and a period of the reverse power supply signal;
• when there is no service on a link for a period of time, the customer premise equipment corresponding to the link reducing a level of power consumption of the power supply to the node device;
• wherein,
• the condition of entering the power-saving mode comprises the node device detecting that power of the reverse power supply of the customer premise equipment reduces;
• the method further comprising:
• the node device in a power-saving mode exiting the power-saving mode after detecting that a customer premise equipment starts reverse power supply to the node device;
• wherein,
• the step of the node device detecting that the customer premise equipment starts reverse power supply to the node device comprises:
• the node device detecting that a reverse power supply voltage signal or a reverse power supply current signal provided by the customer premise equipment gradually rises, and rated power is output stably and continuously.