A …………………… Fire Alarm System B …………………… Building Automation System C …………………… Auto Fare Collection D …………………… Open Transport Network F …………………… Automatic Train Control G …………………… Automatic Train Operation H …………………… Simple Network Management Protocol I …………………… Operated Control Center J …………………… Human Machine Interface K …………………… Application Programming Interface L …………………… Ministry of Construction M …………………… Transmission Control Protocol/Internet Protocol N …………………… Uninterruptible Power Supply O …………………… Mean Time Between Failure P …………………… Mean Time To Repair Q …………………… Local Area Network ( )平均修复时间 ( )局域网