Board, Communications Device, and Method for Supplying Power for Board

A communications device, comprising:

• a backplane;
• multiple boards;
• and
• multiple main power interface units,
• wherein multiple board interfaces are disposed on the backplane,
• wherein each board interface is connected to n main power interface units,
• wherein n is an integer greater than or equal to two, and
• wherein each board comprises:
• a functional module for implementing a service of the board;
• n switch modules, wherein first ends of the n switch modules are all connected to the functional module, and second ends of the n switch modules are connected to n main power interface units respectively, wherein n is an integer greater than or equal to two;
• and
• a power supply selecting module connected to control ends of the n switch modules,
• wherein the power supply selecting module is configured to:
• detect residual power of the n main power interface units;
• select, from main power interface units with residual power greater than or equal to rated power of the board, a main power interface unit with lowest residual power as a power supply interface unit;
• and
• control a switch module connected to the power supply interface unit to be switched on.

A method for supplying power for a board, comprising:

• detecting residual power of n main power interface units;
• selecting, from main power interface units with residual power greater than or equal to rated power of the board, a main power interface unit with lowest residual power as a power supply interface unit, wherein n is an integer greater than or equal to two;
• and
• controlling the power supply interface unit to be connected to a functional module in the board.