physical signaling sublayer

例句：

1. 1.The physical layer of the network is crucial for data transmission.
   网络的物理层对于数据传输至关重要。
2. 2.The physical layer protocol is designed to ensure reliable communication.
   物理层协议旨在确保可靠的通信。
3. 3.The physical layer of the wireless communication system is responsible for transmitting and receiving signals.
   无线通信系统的物理层负责发送和接收信号。