In most cases, an insufficient power supply is the main reason for the loss of video in one or all of the security cameras. Loose cable connections, a faulty PoE injector, or faulty power cables may be to blame for these problems. Basically, video loss means that the receiver (recorder) is not receiving any signal or image from the camera. Video loss in security cameras or CCTV systems can be exhibited in a number of ways.
Connect the IP cameras directly to the NVR (if any) instead of via a PoE switch, since the PoE switch may not supply sufficient power to the IP cameras. The UPS units will ensure the power supply for all cameras when a power outage occurs, mitigating camera shutdown problems. Right now, you can get HUGE EXCLUSIVE discounts of 26% on a wide range of Reolink security cameras, 26% without cables plugged in, 26% indoors and outdoors. In some exceptional cases, the DVR cannot understand the type of signal that the CCTV camera uses, especially among some older CCTV cameras.
In some cases, the security camera you purchased supports a different type of signal than the DVR you're trying to connect. The Reolink RLK8-810B4-A PoE security system allows you to record videos through 4 RLC-810A PoE IP cameras and store them on an 8-channel NVR. I have 4 cameras and they have worked fine for several years and all of a sudden the monitor shows video loss on all 4 cameras. If you use mobile security cameras such as Reolink Go Plus, make sure that the SIM card is inserted correctly, that it is not loose, or that the data is not at maximum.
Too often, an inadequate power supply is the main reason why you don't see any video or video loss on your security cameras. You can find the maximum power consumption in the camera's specification sheet, in the downloads section of the camera's product page. If you have installed a wireless security camera and the live view randomly turns black, or comes and goes in and out, this may be due to a weak Wi-Fi signal. These wireless security cameras can work with two WiFi channels, 2.4 and 5 GHz, ensuring their performance when a frequency band is crowded or there is signal interference.
Reconnect the BNC connector and unplug the PoE switch or injector to troubleshoot video loss issues on PoE IP and analog security cameras. The CCTV camera loses its connection, goes black at night, or doesn't get any video with the surveillance camera showing a black screen. BNC cables or Ethernet network cables, to some extent, could have an impact on the functionality of surveillance cameras, especially analog CCTV cameras, which could be at greater risk of video loss or signal loss than PoE cameras.