Honeywell ControlEdge 900R04-0200 Getting Started page 30

Chapter 3 - Hardware
30
Ring Topology
The following diagram shows an example of the ring topology.
CPM port 3 (ETH3) must be connected to CPM port 4 (ETH4) or
n
EPM port 2 (ETH2).
CPM port 4 (ETH4) must be connected to CPM port 3 (ETH3) or
n
EPM port 1 (ETH1).
EPM port 1 (ETH1) must be connected to EPM port 2 (ETH2) or
n
CPM port 4 (EHT4).
EPM port 2 (ETH2) must be connected to EPM port 1 (ETH1) or
n
CPM port 3 (EHT3).
For more information, see "Planning for network topology" in the
ControlEdge 900 Controller Hardware Planning and Installation Guide.