2.6.2.1. 平稳实现由LKJ设备控制列车转为ATP控制列车。为实现正常的转换功能，在级间切换点前，地面设备应提供如下配置：
It is smoothly realized that the train is controlled by LKJ equipment is transformed into that by ATP. In order to realize normal switching function, before interclass switching point, wayside equipment shall provide the following configuration:
? 在级间切换点之前，应当通过应答器向ATP设备提供线路数据及临时限速数据；
Before interclass switching point, shall provide track data and temporary speed limiting data through balise for ATP equipment;
? 转换点之前提供数据的应答器应当成组设置，以使ATP确定列车运行方向；
Balises providing data before switching point shall be set in groups so as for ATP to determine the train traveling direction;
? 在转换点之前，至少有一段轨道电路为ZPW2000或UM71制式。
Before switching point, at least a section of track circuit shall be ZPW2000or UM71 format.

Beijing Chinese Subtitling Translation Service Agency has translated many technical documents about Balise definition and Switching requirement.
华译网上海翻译公司曾经翻译过大量有关应答器定义和转换要求的资料文件。

2.6.2.2. 应答器定义 Balise definition
1. B1应答器（位于前站出站口）：提供TSR及线路数据并连接预告应答器；
B1 balise (located at front station exit): providing TSR and track data and connecting forecast balise;
2. B2应答器（距转换点D_LEVELTR距离）：预告转换，提供到转换点距离信息；
B2 balise (distance away from switching point D_LEVELTR): forecasting switching, providing distance information to switching point;
3. B3应答器（位于转换点）：转换执行；
B3 balise (at switching point): switching implementation;

2.6.2.3. 转换要求 Switching requirement
R-SYS-A-012：CTCS0/1级到CTCS2级的转换需具备以下条件：
R-SYS-A-012: For switching from Class CTCS0/1 to Class CTCS2, the following conditions are necessary:
条件：CTCS0/1→CTCS2转换使用两组应答器完成，包括以下信息：
Conditions: switching from CTCS0/1→CTCS2 will adopt two groups of balises for implementing, including the following  information:
1. 第一组应答器使用[ETCS-41]数据包预告在D_LEVELTR处进行级间转换；
The first group of balises adopts [ETCS-41] data package, forecasting interclass switching at D_LEVELTR;
2. 第二组应答器使用[ETCS-41]数据包进行等级转换。
The second group of balises adopts [ETCS-41] data package for class switching.
3. 在转换前的一段轨道电路为ZPW2000或UM71轨道电路。
The section of track circuit before switching is ZPW2000 or UM71 track circuit.
过程：处理过程见R-SYS-A-13至R-SYS-A-18。
Process: for treatment process, see R-SYS-A-13 to R-SYS-A-18.
输出：进行级间转换后的转换结果。
Output: switching results after interclass switching.
SIL: 4
USER：《既有线200km/h动车组列控系统车载设备和地面设备配置及运用技术原则（暂行）》的补充：级间转换的补充。
USER: supplement to The on-vehicle equipment of the train control system of cable 200km/h motor train set, the surface device layout and the principle of application technology (Temporary): supplement to interclass switching.
假定：为保证安全，如果在转换点之前或转换点处存在临时限速，应由LKJ或司机负责将列车控制在临时限速以下运行。
Assuming: in order to ensure safety, if there is temporary speed limiting before or at switching point, it shall be controlled by LKJ or the driver that the train travels at the speed lower than temporary limited speed.