最近,为适应计算机通信网络的要求,出现了一种称之为“虚拟切入”(“virtual cut-through”)的新转接技术。本文要分析多个分组报文(multipacket messages)虚拟切入的技术,还介绍经修改后允许部分切入(partial cuts)的虚拟切入转接技术,并分析了部分切入的性能。从某种观点来讲,部分切入具有很多优点,即使在最差条件下,也就是线路利用率(line utilisation)在0.4和0.8之间,使用部分切入也可提高现存网络的性能。为了更好地理解这种切换技术的性能,本文还给出了各种性能曲线。 Recently, to meet the demands of computer communication networks, a new transfer technology called “virtual cut-through” has emerged. This article analyzes the techniques of virtual hand-in for multiple packet messages, introduces virtual hand-in and handoff techniques that allow for partial cuts as modified, and analyzes the performance of partial hand-in. From a certain point of view, partial hand-in has many advantages, even with worst-case conditions, where line utilization is between 0.4 and 0.8. Using partial hand-in can also improve the performance of existing networks. In order to better understand the performance of this switching technology, this article also gives a variety of performance curves.