GE P24DM Technical Manual

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4.9 OPTO-INPUT CONNECTIONSThese should be wired with 1 mm2 PVC insulated multi-stranded copper wire terminated with M4 ring terminals.Each opto-input has a selectable preset ½ cycle filter. This makes the input immune to noise induced on the wiring.This can, however slow down the response. If you need to switch off the ½ cycle filter, either use double poleswitching on the input, or screened twisted cable on the input circuit.Caution:Protect the opto-inputs and their wiring with a maximum 16 A high rupture capacity(HRC) type NIT or TIA fuse.4.10 OUTPUT RELAY CONNECTIONSThese should be wired with 1 mm PVC insulated multi-stranded copper wire terminated with M4 ring terminals.4.11 ETHERNET METALLIC CONNECTIONSIf the device has a metallic Ethernet connection, it can be connected to either a 10Base-T or a 100Base-TXEthernet hub. Due to noise sensitivity, we recommend this type of connection only for short distance connections,ideally where the products and hubs are in the same cubicle. For increased noise immunity, CAT 6 (category 6) STP(shielded twisted pair) cable and connectors can be used.The connector for the Ethernet port is a shielded RJ-45. The pin-out is as follows:Pin Signal name Signal definition1 TXP Transmit (positive)2 TXN Transmit (negative)3 RXP Receive (positive)4 - Not used5 - Not used6 RXN Receive (negative)7 - Not used8 - Not used4.12 ETHERNET FIBRE CONNECTIONSWe recommend the use of fibre-optic connections for permanent connections in a substation environment. The100 Mbps fibre optic port is based on the 100BaseFX standard and uses type LC connectors. They are compatiblewith 50/125 μm or 62.5/125 μm multimode fibres at 1300 nm wavelength.4.13 USB CONNECTIONThe IED has a type B USB socket on the front panel. A standard USB printer cable (type A one end, type B the otherend) can be used to connect a local PC to the IED. This cable is the same as that used for connecting a printer to aPC.P24xM Chapter 18 - InstallationP24xM-TM-EN-2.1 391