问题 问答题 简答题

可实现的ePfC板的具体功能有哪些?

答案

参考答案:

1.每块单板支持4路EPON的OLT端口,每路上下行速率1.25GbPS;

2.通过4路PHY向系统后背板侧提供串行数据接口;

3.支持802.3Ah标准的多点控制协议(MPCP)、OAM等功能;

4.支持ONU动态发现、自动注册和动态测距;

5.完成完善的DBA功能;

6.支持IGMPSNOOPiNg,每个PON支持256个组播组;

7.提供4个EPON分别上到主备交换板的切换机制;

8.单板有MPU系统,提供完整的单板OAM功能;

9.同步系统时钟方案。

阅读理解
完形填空(本大题共10小题,每小题1分,共10分)
Most adults once studied at school, had classes and did their homework every day. The same ______ is going on at school now. _______ it seems that doing weekend homework is _______ problem for the modern students.
All the students should agree that weekend homework should be abolished(取消). It's _______ for them studying at school five days a week. They have a lot of interests. With homework to do on Saturday and Sunday, when can they find _______ to help around the house, go and see a football or basketball game or a good film, join in family recreations(娱乐), or just have ______ at home? Because of these other activities, the homework can't be finished until _______. So their weekend homework is usually done in such a hurry that on Monday teachers are ________ and often threaten(威胁) to fail whole class of students because they know nothing about the ______. If there were no weekend homework for the students to do, they would be happy to go to school on Monday ______ having a good rest and to learn what the teachers teach.
小题1:
A.thingB.schoolC.classD.homework
小题2:
A.AlsoB.ButC.StillD.Though
小题3:
A.noB.anotherC.oneD.other
小题4:
A.not enoughB.enoughC.no goodD.no use
小题5:
A.friendsB.timeC.placesD.money
小题6:
A.a restB.an examC.a lessonD.a picnic
小题7:
A.Monday afternoonB.Saturday afternoonC.Friday nightD.Sunday night
小题8:
A.pleasedB.sorryC.unhappyD.not worried
小题9:
A.lessonB.gamesC.interestsD.activities
小题10:
A.untilB.whenC.beforeD.after
单项选择题