General specification for digital display of mimic board 模拟屏数字显示器通用技术条件
2.
A 20 % spare capacity shall be provided ( equipped ) within the mimic driver and the wiring to the mimic board to allow for future modifications . the spare capacity shall be evenly distributed 的备用容量必须由模拟驱动器提供并且与模拟板连接以备将来的修改。备用容量必须均匀地分布。