Chapter 15: Appendix
15-3 Definition of network systems
[1] Communication protocol standards
The term "Communication protocol" refers to the rules for exchanging information between systems on a particular communication circuit. The communication protocols used by
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communication protocol | ||
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UDP | RFC768 | |
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IP, ICMP etc. | RFC791, 792, 919, 922, 950 | |
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APR etc. | RFC826, 894 | |
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Ethernet | IEEE802.3 | |
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[2] Hierarchical structure of the communication protocols
The communication protocols are configured as a layered structure. Communication processes are expressed and standardized by classification and they are arranged in various levels. The
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| Cyclic transfer | Service function |
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| Message transfer |
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| Token function |
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Transport layer |
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| UDP |
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Network layer |
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Data link layer |
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Physical layer |
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Hierarchical structure of the FA link protocol
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