访问周期 meaning in English

access cycle
access period

Secondly , i study the real - tune quality of ethernet and find out the ethernet is n ' t a real - time network . although real - time networks has a high real - time quality , it ' s stability is worse than ethernet ' s . we buy better networks " hardware and lessen the period of communication , so we need n ' t to improve the protocol of ethernet
然后再对网络的实时性进行研究，虽然以太网不是一个实时的通信网，但现在的实时通信网协议层比较少，这会带来通信的可靠性问题，所以为了保证通信的可靠性和实时性我们通过加大硬件投资和减少访问周期来达到实时性，这样就不必要通过改变以太网的协议层就可以实现实时性的要求。