Manufacture serial number. The manufacture serial number of the entity such as chassis, module, and so on. It is got from the device when manufacturing. For low level box-device, the manufacture serial number is the device-number of System Control Board(SCB for short), it is written into the SCB directly; for middle level or high level frame-device, the manufacture serial number is the device-numbers of SCB and Service Board, because the SCB, Service Board and chassis are separate to sale and the device-number of chassis cannot be written into board.