mscShelfBusOperatingMode 1.3.6.1.4.1.562.36.2.1.13.11.1.1

This attribute indicates the current backplane bus operating mode: noBus No bus is in service now. singleBusX The shelf is running on bus X only. singleBusY The shelf is running on bus Y only. dualBus The shelf is running on bus X and bus Y.