HS-P1101RS GPON IoT ONU Serial UART 1×RS232/RS485 MQTT . The HS-P1101RS series ONU is an intelligent GPON/EPON terminal product launched by E-SHEN Communication Technology Co., Ltd. for industrial IoT communication multi service fusion networks. HS-P1101RS follows the ITU-T G.984.x standard, IEEE 802.3ah, CTC 2.0, 2.1/3.0 standards, and has good interoperability and operability, compatible with OLT devices from mainstream manufacturers such as Huawei/ZTE/FiberHome/Nokia.