In the network control program, a user-specified interval between successive attempts at service-seeking on a line when all devices on the line are responding negatively to polling. The pause can be used to reduce the overhead associated with polling.

• 在网络控制程序中,当线路上所有的设备对轮询作否定应答时,由用户指定的对线路作相继两次服务查询的时间间隔,这种暂停期能减少与轮询有关的系统开销。