GE Industrial Solutions Entellisys System User Manual - Manual (Page 18)

System architecture 18
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Figure 1-8 Compartment ID Button un-tethered from switchgear
1.3.6 Messenger communications network
The Messenger communications networks are closed, dedicated LANs for transmitting
information between the Messengers and the CPUs in the system. The LANs are for the
Entellisys system only and should never be connected to other networks.
CAUTION: Failure to maintain a dedicated LAN will result in the EntelliGuard Messenger
reverting to back-up Overcurrent protection.
A Messenger switch is required to route information appropriately. The communication wiring
required is 100BaseT, CAT5 cables.
Each CPU resides on a separate network, providing redundant communications.
1.3.7 Messenger switch
The Messenger switch enables the communication network between the Messengers and
corresponding CPU. A Messenger switch is required for each of the two redundant networks. The
number of ports provided is determined by the number of circuit breakers in the system. Each
circuit breaker requires its own port in the switch.
The largest switch provides only 24 ports. If the number of circuit breakers in the system
exceeds 22, a pyramid switch scheme, utilizing multiple switches, is required.