【多选题】
A 1) DNI-PW方案结合TDM业务，当前推荐的应该是在AC侧配置MSP 1+1方案； For DNI-PW scheme combining with TDM service, it is recommended to configure MSP 1+1 scheme at AC side.
B 2) DNI-PW方案结合TDM业务，两端的MC-MSP 需要正确应的MSP保护组ID一致，才会识别为一个ICCP保护组； For DNI-PW scheme combing with TDM service, MC-MSPs at two ends require the corresponding MSP protection group IDs to be the same so that they can be identified as one ICCP protection group.
C 3) 若DNI-PW 中断，那么接入层若开启的是单发双收，则有可能收到两份流量 If DNI-PW is interrupted, and if the access layer is enabled with single-transmit dual-receive, two copies of traffic may be received.
D 4) 正常情况下，PW 只需要单发即可，流量上行会在到达主节点进行复制到AC/DNI-PW的动作； Under normal circumstances, the service transmit mode is set as single-transmit (send the service only on the working PW). After the service traffic reaches the master node, the node will double the traffic received on the working PW and then send one to AC sie and the other to DNI PW.
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