外文翻譯---雙速mil-std-1553b兼容的光纖數(shù)據(jù)總線-其他專(zhuān)業(yè)-文庫(kù)吧資料
2025-01-27 09:23本頁(yè)面
【正文】 parison of the high speed data transmitted over the bus with the data received. The number of plete message transfers is displayed on the face of the tester as well as a count of any errors detected. The message transfer sequence between the ponents making up the highspeed test set is illustrated in Figure 5. Figure 5. Single Direction 20 Mb/s Data Transfer Sequence from Remote Terminal to Bus Controller Optical Power Budget The optical power budget for the fiber optic bus system is tabularized in Table 1. The expected typical values were derived from quoted manufacturers39。C to +85℃ has been demonstrated. The fiber optic cable assemblies were fabricated using lengths of avionic fiber optic cable connectorized with the ATamp。T, as a sensitivity of approximately 34 dBm (average) for 10 39。s inputs. This effectively forms an optical broadcast bus, which is identical in function to the 1553B bus it replaces. A transmissive star coupler provides a passive transmission path having an adequate optical loss characteristic and minimal impact on system optical dynamic range requirements. Figure 2. Fiber Optic Network Architecture For purposes of increased reliability, the 1553B standard requires that the bus consist of dualredundant transmission channels. As a consequence, the fiber optic 1553Bl MSDRT Data Bus was configured as a dualredundant system, as represented in Figure 3. All FOIUs actually consist of two separate channels, labeled A and B in the figure, each having a separate 1553B interface connection, and each having optical connections to separate star couplers. Figure 3. DualRedundant Fiber Optic 15638/20Mbit Bus Configuration FOIUs are connected directly to 1553B I/O ports associated with user equipment, and provide the necessary translation of trilevel 1553B signal format to the bilevel optical format. In addition, the FOIU provides the optical transceiver function, which transmits and receives the optical signals on the fiber optic bus structure. This makes it possible to retrofit any system interconnected by a 1553B electrical bus with a fiber optic 1553B bus by merely replacing the wire portion of the bus with FOIUs and the optical bus structure, The FOIUs are designed to handle both l Mb/s and 20Mb/s munication, or just 1Mb/s transfers, depending on their application in the system. The demonstration system was developed as a direct replacement for the wire portion of any existing 1553B bus. This required that the fiber optic bus interface directly with any 1553B I/O connector and be patible with any legitimate 1553B interface level. In addition, the highspeed 20Mb/s test units were designed to be operable with any 1553B device on the bus without causing disruption. A system configuration diagram of the fiber optic bus system is shown in Figures 3 and 4.
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