CBTC is adopted for signal system of Xi 'an Subway Line 2, which is a complete and movable block train control system based on wireless communication technology.

西安地铁2号线信号系统采用完整的、基于无线通信技术的、移动闭塞制式的CBTC列车自动控制系统。

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Hereinto, DSU is shorted for database storage unit. It is one subsystem of communication based train control (CBTC) system.

其中，DSU是数据库存储单元的简称，它是CBTC系统所包含的诸多子系统之一。

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