Presently , the apon system adopts tdma as the access mode on the uplink . it requires not too much in terms of optical performance , but it requires more complex electronic equipment ( e . g . , complex synchronized timing , ranging and delay control technolgies ) to avoid the collision of uplink information packets 目前apon系統在上行信道中采用時分多址的接入方式,它對光性能方面的要求不高,但它要求更復雜的電子設備,如要求復雜的同步定時、測距和延時控制技術,以避免上行信息分組產生碰撞。
Focusing on the time constraint problem in protocol testing theories , a strict constraint over time parameters in protocol testing was presented from several conformance testing methods , and a test case generation algorithm was given under the strict time constraint based on waiting , coordination and synchronizing time 摘要針對協議測試理論中的時間約束問題,從不同的一致性測試方法出發對協議測試中的時間參數做了嚴格的約束,同時給出了基于等待、協調和同步時間的嚴格約束下的測試用例生成算法。