计算机工程与设计
計算機工程與設計
계산궤공정여설계
COMPUTER ENGINEERING AND DESIGN
2015年
4期
892-895,905
,共5页
航空电子全双工交换式以太网%信用量令牌桶%时延抖动%通信完整性%虚拟链路
航空電子全雙工交換式以太網%信用量令牌桶%時延抖動%通信完整性%虛擬鏈路
항공전자전쌍공교환식이태망%신용량령패통%시연두동%통신완정성%허의련로
AFDX%credited token bucket%jitter%communication integrity%virtual link
航空电子全双工交换式以太网(AFDX)采用信用量令牌桶进行流量管制,为确保信用量设置的合理性,需要考虑虚拟链路(VL)的时延抖动情况。利用网络演算计算 VL 流量延迟边界,利用“Group”方法获得 VL 在整个网络中的分布式时延抖动大小,以此为基础分析时延抖动值对信用量设置的影响,利用等效带宽比概念提出交换节点流量带宽约束条件,构建4种不同通信完整性级别的约束准则,为交换节点信用量的合理设置提供设置参考。
航空電子全雙工交換式以太網(AFDX)採用信用量令牌桶進行流量管製,為確保信用量設置的閤理性,需要攷慮虛擬鏈路(VL)的時延抖動情況。利用網絡縯算計算 VL 流量延遲邊界,利用“Group”方法穫得 VL 在整箇網絡中的分佈式時延抖動大小,以此為基礎分析時延抖動值對信用量設置的影響,利用等效帶寬比概唸提齣交換節點流量帶寬約束條件,構建4種不同通信完整性級彆的約束準則,為交換節點信用量的閤理設置提供設置參攷。
항공전자전쌍공교환식이태망(AFDX)채용신용량령패통진행류량관제,위학보신용량설치적합이성,수요고필허의련로(VL)적시연두동정황。이용망락연산계산 VL 류량연지변계,이용“Group”방법획득 VL 재정개망락중적분포식시연두동대소,이차위기출분석시연두동치대신용량설치적영향,이용등효대관비개념제출교환절점류량대관약속조건,구건4충불동통신완정성급별적약속준칙,위교환절점신용량적합리설치제공설치삼고。
Avionics full duplex switched Ethernet (AFDX)adopts credited token bucket consume model for real-time communi-cation traffic policing.To ensure the rationality of the setting of credit amounts,the jitters of virtual links (VL)need to be con-sidered.Network calculus model was used to calculate VL flow end-to-end delays,and the “Group”method was used to obtain the distributed delays of VL in the whole network.Based on the distributed delays,the influence of jitter value on credit amount setting was analyzed.By using the equivalent bandwidth concept,the flow bandwidth constraints for switching nodes were pro-posed,and four constraint conditions models for different communication integrity levels were established,which provided a rea-sonable reference for the setting of credit values.