DDM is digital diagnostic monitoring, its role is to monitor the voltage, current, temperature and displays the factory information. If a module does not have DDM function, once the products have problems, it will not be prompted Warning.

HTF all optical module has DDM function, from 155M, 1.25G, 2.5G, 10G, 25G, 40G, 50G, 100G,  400G optical transceiver. 

If you want to know more, welcome to cotact HTF team, to get free optical module buying tips. 

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