当数据从一个设备传送到另一个设备时，用于补偿数据流速率差或事件发生时间差的一种例行程序或存储器。 A routine or storage used to compensate for a difference in rate of flow of data, or time of occurrence of events, when transferring data from one device to another.
在环形网络上，与数据流方向相反的比特流。对照downstream On a ring network, the direction opposite to that of data flow.
