外文翻譯---雙速mil-std-1553b兼容的光纖數(shù)據(jù)總線-其他專業(yè)-展示頁(yè)
2025-01-31 09:23本頁(yè)面
【正文】 Figure 3 illustrates the system with two lowspeed FOIUs singled out, while Figure 4 depicts what could be the same system, but with the high speed test set specifically illustrated. Figure 4. Fiber Optic Bus Configuration Showing HighSpeed Test Set Demonstration System Fiber Optic Bus Hardware The demonstration system fiber optic bus structure was realized using readily available fiber optic ponents. A single bus structure was made up of connector fiber optic cables and a 1616 port transmissive star coupler (expansion to a 32 port coupler is also considered to he feasible). The FOIUs housed optical transmitters, optical receivers, lowspeed logic and levelshift circuit boards, and where employed, the highspeed transmitter and receiver logic. In addition the units contained their own power supplies. These units were mounted on the exterior cabiry of user equipment being demonstrated, and hooked directly into the 1553B I/O connector. Each FOIU contained two logic boards, each serving one of the dualredundant channels. Circuits were realized using Small Scale Integrated TransistorTransistor Logic (SSI 39。T Fiber Optic 1553/MSDRT Data Bus provides an efficient means of improving the data handling capabilities of the 1553B data bus. Through the use of fiber optics and high speed digital multiplexing techniques, a single fiber optic bus can provide both 1 Mb/s and 20 Mb/s transmission capability when supported by 1553B bus hardware. The 20 Mb/s operation is based on the Multiple Speed Data Rate Transmission (MSDRT) concept, which involves multiplexing 20 Mb/s data with standard 1553B protocol in a manner which is invisible to 1 Mb/s users. This dualspeed capability provides retrofit highspeed capability to existing systems based on 1553B, and allows for graceful system growth in the event of system upgrades. A dual speed single fiber transmission bus was chosen over an approach using separate busses for 1 Mb/s transmission and for higher speed transmission because the single fiber bus approach is more reliable, less expensive, and lighter weight. The fiber optic bus is patible with 1553B hardware, application and protocol software, and error handling routines, resulting in reduced cost and schedule impact for future technology upgrades. In addition, the use of fiber optics offers inherent immunity to electromagic interference, RF interference, electromagic pulses, and is nonradiating. Approach The fiber optic data bus was designed to directly interface with existing 1553B bus controllers and remote terminal hardware. This was done to take advantage of existing technology and thereby reduce development time and cost. Operational control and error handling routines of the bus were acplished by the 1553B application and protocol software. The bus is configured as a mon point broadcast work capable of supporting up to 31 nodes. It is posed of Fiber
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