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  1. LongNg

    Optical signal transmission

    Hi everyone I’m facing a strange issue and would like to ask for your advice. When I plug the SFP (fiber) module into the switch, all cameras and NVRs lose connection and there’s no signal at all. However, when I completely remove the SFP module from the fiber port, all cameras and NVRs...
  2. LongNg

    Optical signal transmission

    Hi everyone I’m facing a strange issue and would like to ask for your advice. When I plug the SFP (fiber) module into the switch, all cameras and NVRs lose connection and there’s no signal at all. However, when I completely remove the SFP module from the fiber port, all cameras and NVRs...
  3. LongNg

    Managed PoE switches randomly lose port power/signals

    Hi everyone, I’m having an intermittent issue with two PoE switches (each 16 ports, used to power IP cameras). Case 1: Sometimes, one PoE port suddenly loses both power and network link. When I move the cable to another port, it works normally. Case 2: On another switch (same 16-port model), all...
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