15.14 Denial of service15.14.1 IdentificationFunction description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberDenial of service, frame rate control forfront portDOSFRNT - -Function description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberDenial of service, frame rate control forLAN1 portDOSLAN1 - -15.14.2 ApplicationThe denial of service functions (DOSFRNT,DOSLAN1 and DOSSCKT) are designed tolimit the CPU load that can be produced by Ethernet network traffic on the IED. Thecommunication facilities must not be allowed to compromise the primary functionality ofthe device. All inbound network traffic will be quota controlled so that too heavy networkloads can be controlled. Heavy network load might for instance be the result ofmalfunctioning equipment connected to the network.DOSFRNT, DOSLAN1 and DOSSCKT measures the IED load from communicationand, if necessary, limit it for not jeopardizing the IEDs control and protection functionalitydue to high CPU load. The function has the following outputs:• LINKUP indicates the Ethernet link status• WARNING indicates that communication (frame rate) is higher than normal• ALARM indicates that the IED limits communication15.14.3 Setting guidelinesThe function does not have any parameters available in the local HMI or PCM600.1MRK 511 286-UUS A Section 15Basic IED functions343Application manual
