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The connectors in Zone-3 are user defined and are usually used to connect a front board to a Rear Transition Module. The Zone-3 area can also hold a special backplane to interconnect boards with signals that are not defined in the AdvancedTCA specification.
The AdvancedTCA Fabric specification uses Logical Slots to describe the interconnections. The Fabric Switch Boards go in Logical Slots 1 & 2. The chassis manufacturer is free to decide the relationship between Logical and Physical Slots in a chassis. The chassis [[Field Replaceable Unit]]s (FRU) data includes an Address Table that describes the relationship between the Logical and Physical slots.
The Shelf Managers communicate with each board and FRU in the chassis with IPMI ([[Intelligent Platform Management Interface]]) protocols running on redundant [[I²C]] buses on the Zone-1 connectors.
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