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Description The SDW-550 EC, make Westermo, is a five port 10/100Base Ethernet switch used as interface between USI-0001 or USI-0002 communication modules in the Control Processor and the field. Figure 424 on page 681 shows that the SDW-550 EC has one (24Vdc) power connector and five isolated RJ-45 TX port connectors, divided into two sections. The raised isolation level between the two port sections makes the SDW-550-EC compliant to the IEC 61010. For IEC 61010 compliance use one section (e.g. ports 1, 2 and 3) must be connected to the field while the other section (ports 4 and 5) must connect to the CP backplane, thus optimizing power surge protection from the field.