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What is the purpose fo the four Ethernet ports on the front of the M340 BMXNOC0401 module?

Title
Four Ethernet ports on the front of the M340 BMXNOC0401 module
 
Issue
Four Ethernet ports on the front of the M340 BMXNOC0401 module
 
Product Line
M340 BMXNOC0401
 
Environment
Unity Pro
 
Cause
N/A
 
Resolution
 The BMXNOC0401 Ethernet communication module communicates over an industrial Ethernet network through any one of four RJ45 connectors located on the front of the module.
  •  Use the top two ports (ports 1 and 2) to connect to end devices.
  •  Use the bottom two ports (ports 3 and 4)—which support the RSTP redundancy protocol—to connect to the local area networks, for example, in a ring topology.
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