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Most of the Praesideo systems are equipped with a plastic fiber interface. The plastic optical fiber interface is mainly used to connect nodes not more than 50 meters apart from each other. If the distance is more than 50 meters, fiberglass cables are needed. The fiber interface can be converted from plastic fiber cable to glass fiber cable and vice versa. These fiber interfaces have one power input and two control inputs for supplying power to the remote network portion. The control input can transmit monitoring information related to the power equipment connected with the optical fiber interface. Basic function these devices can connect glass fiber optic cable to plastic fiber optic cable and support redundant wiring topology. In many applications, this is necessary because glass fibers connect much longer distances than plastic fibers. When converted to glass fiber, it must be converted back to plastic fiber before connecting to other Praesideo devices, because they all use plastic fiber interfaces. This means that these devices must be used in pairs from beginning to end. Each interface can use an external 48 VDC power source to power itself or a remote part of the network. If there is no external power, the fiber interface is powered by the network controller. The ? PRS FIN and PRS?FINS have two control inputs. These inputs can be used to accept the failure output of an external power source (UPS), allowing the device to monitor the power supply and report the failure to the network controller. The optical fiber interface has two LED indicators for diagnostic purposes. PRS?FINNA and PRS?FIN are identical except that there is no network node address. The benefit is that the device does not occupy one of the 60 possible addresses in the network. However, there is a downside to not using an address: it cannot capture the state of a two-way control input as PRS?FIN does. PRS?FINS and PRS - FINS are identical except for single - mode glass fiber instead of multi - mode glass fiber. However, this does not increase the maximum allowable cable length of the Praesideo network. Control and indicator, state power LED lights, network status LED indicators of interconnected components, used for plastic optical fiber network connections, used in glass fiber network connection, external power input, two way control input (non PRS ? FINNA) certificate and recognized safety conforms to the standard IEC 60065 / EN 60065 immunity in accordance with EN 55103 ? 2 / EN 50130 / EN 50121 ? ? 4 standard cooling conform to EN 55103-1/4 FCC - 47 Part 15B of the standard urgently meets EN 60849/EN 54-16 /ISO 7240-16 sailing meets IEC 60945