This document describes the EMMA-A01 and EMMA-A02 (EMMA for short) in terms of safety precautions, product introduction, installation, electrical connections, power-on and commissioning, maintenance, and technical data. Read this document carefully before installing and using the EMMA. Some functions can be configured on an optical interface only after the interface connects to a transmission medium (such as an optical module or copper module). If high-power optical signals (caused by an optical time domain reflectometer or self-loop test) are transmitted through an optical module that is used for long-distance transmission but no optical attenuator is used, the optical power will exceed the overload power of. The Combo interface, also known as the optical-electrical multiplexing interface, consists of two Ethernet ports (one optical and one electrical) on the device panel, and there is only one forwarding interface inside the device. This document describes the configurations of Device Management, including device status query, hardware management, Stack, SVF, cloud-based management, PoE, monitoring interface, OPS, energy-saving management, information center, fault management, NTP, synchronous ethernet, PTP. This document. To facilitate its use in different fields, relevant development guides document are also provided with the module, which can be obtained through Huawei website. HUAWEI EM820W HSPA+ PC Embedded Module Hardware Guide Overall Description Overall Description 2. 1 About This Chapter This chapter gives a.