• the fact that at least one user has tried to log on wrongly into the IED and it was
blocked (the output USRBLKED)
• the fact that at least one user is logged on (the output LOGGEDON)
Whenever one of the two events occurs, the corresponding output (USRBLKED or
LOGGEDON) is activated.
17.16 Denial of service
17.16.1 Functionality
The Denial of service functions (DOSLAN1 and DOSFRNT) are designed to limit
overload on the IED produced by heavy Ethernet network traffic. The communication
facilities must not be allowed to compromise the primary functionality of the device.
All inbound network traffic will be quota controlled so that too heavy network loads
can be controlled. Heavy network load might for instance be the result of
malfunctioning equipment connected to the network.
17.16.2 Denial of service, frame rate control for front port DOSFRNT
17.16.2.1 Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Denial of service, frame rate control for
front port
DOSFRNT - -
17.16.2.2 Function block
DOSFRNT
LINKUP
WARNING
ALARM
IEC09000133-1-en.vsd
IEC09000133 V1 EN
Figure 312: DOSFRNT function block
17.16.2.3 Signals
Table 526: DOSFRNT Output signals
Name
Type Description
LINKUP BOOLEAN Ethernet link status
WARNING BOOLEAN Frame rate is higher than normal state
ALARM BOOLEAN Frame rate is higher than throttle state
Section 17 1MRK 502 048-UEN A
Basic IED functions
654
Technical manual
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