Because Huawei MA5600T, OSN 8800, OSN3500 is DC power, when you buy Huawei OLT or WDM devices, you need to choose a AC/DC converter to meet your AC plat; ETP4890-A2 is a very normal converter, there are three kinds of modules, what are the difference of these modules?
1, SMU01A can support WebUI remote manage function, SMU01B and SMU01C cannot support WebUI feature.
2, SMU01B supports Huawei master/slave protocols and access network point-to-point protocols, which allows Huawei access network communications equipment to connect to the U2000.
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