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The eLAN SCS typically resides in the substation and has a direct connection
to all IEDs. It provides a single point of access to these devices, over a Wide
Area Network (WAN) or modem connection. The strength of the eLAN SCS lies in
its ability to support multiple, concurrent host interfaces; each getting
the specific data it needs. For example, from a particular relay, SCADA
data may be sent to the EMS, using a SCADA protocol; a different subset
of data may go to a historian, such as PI or eDNA, using OPC, and fault
files may be automatically extracted and distributed to interested users.
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