BMS transmits various operational data in real-time to the BMS center using a mobile or exclusive communication network. In addition, BMS center sends out operational commands and instructions to the buses over the network. BMS consists of vehicle devices (BMS device) and the BMS center (H/W, N/W, S/W, and Application System). In addition, wireless communication network between the center and the vehicles is also very important. KSCC’s BDC is able to implement this function.