An equipment rack , wherein the equipment rack comprises: a management controller ; a first chassis including a first power supply unit , a first system bus coupled to the first power supply unit, a first chassis management controller coupled to the first system bus, and a first network device , wherein the first power supply unit sends status data to the first system bus; a second chassis including a second power supply unit , a second system bus coupled to the second power supply unit, a second chassis management controller coupled to the second system bus, and a second network device , wherein the second power supply unit sends status data to the second system bus; wherein the first chassis management controller is in communication with the first system bus to obtain status data from the first power supply unit , and the second system bus to obtain status data from the second power supply unit , and wherein the first chassis management controller is in communication with the management controller to relay the status data; and a first SMbus arbiter and a second SMbus arbiter used for switching status data between the first chassis management controller and the second chassis management controller , respectively; wherein the second chassis management controller is in communication with the first system bus to obtain status data from the first power supply unit , and the second system bus to obtain status data from the second power supply unit ; and wherein the equipment rack is operable to establish communication between the management controller and the second chassis management controller to relay the status data, when determining that status data from the first chassis management controller is not relayed. a management controller ; a first chassis including a first power supply unit , a first system bus coupled to the first power supply unit, a first chassis management controller coupled to the first system bus, and a first network device , wherein the first power supply unit sends status data to the first system bus; a second chassis including a second power supply unit , a second system bus coupled to the second power supply unit, a second chassis management controller coupled to the second system bus, and a second network device , wherein the second power supply unit sends status data to the second system bus; wherein the first chassis management controller is in communication with the first system bus to obtain status data from the first power supply unit , and the second system bus to obtain status data from the second power supply unit , and wherein the first chassis management controller is in communication with the management controller to relay the status data; and a first SMbus arbiter and a second SMbus arbiter used for switching status data between the first chassis management controller and the second chassis management controller , respectively; wherein the second chassis management controller is in communication with the first system bus to obtain status data from the first power supply unit , and the second system bus to obtain status data from the second power supply unit ; and wherein the equipment rack is operable to establish communication between the management controller and the second chassis management controller to relay the status data, when determining that status data from the first chassis management controller is not relayed. <EOS>