retransmission timer重传定时器;重传计时器
Fast Retransmission快速重传;快速重发
block retransmission[计] 程序块重发
continuous retransmission[广播] 连续重发
retransmission detection检测重传
retransmission process[通信] 重发过程
retransmission datagram数据重传
partial retransmission部分重传
error retransmission出错重传
If the timer expires before data in the segment is acknowledged, TCP assumes that the segment has lost or being damaged, and a retransmission is sent.
如果在报文段中的数据未确认之前定时器超时，TCP就认为该报文段已经丢失或出现损坏，从而重传这一报文段。
参考来源 - 置位法解决TCP重传二义性问题