Fujitsu MJA2500BH Maintenance Manual - Page 85
Logical Interface, Conceptual diagram of communication layers
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5.2 Logical Interface 5.2 Logical Interface The host system and the device communicate with each other by sending and receiving serial data. The host and the device have several dedicated communication layers between them. These layers have different functions, enabling communication between the different levels of layers within the host or device and between layers at the same level that link the host and device. Figure 5.3 is a conceptual diagram of the communication layers. Host: Software control Buffer Memory DMA engine(s) Shadow Block Register Transport Layer Link Layer Physical Layer Host located layers Application layer 4 Transport layer 3 Link layer 2 Physical layer 1 Device: Software control Buffer memory DMA engine(s) Block Register Transport Layer Link Layer Physical Layer Device located layers Figure 5.3 Conceptual diagram of communication layers C141-E293 5-11