For input buffered cell - based switches (such as ATM)with single FIFO queues per input port, the factor of throughput is affected mostly by HOL(head of line)blocking.

• 对于输入端口具有单输入FIFO(先入先出)队列的输入缓冲信元交换机(如 ATM),影响交换吞吐率的主要因素是信头阻塞(HOL)。