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(80)No.7信令方式采用( )来传送各用户部分的消息、信令网管理消息及信令网测试和维护消息。
A. 消息信号单元MSU
B. 链路状态信号单元LSSU
C. 填充信号单元FISU
D. ATM信元
Thus the main advantage of store-and-forward transmission over circuit (95) is that the communication bandwidth is dynamically allocated,and the allocation is done on the fine basis of a particular link in the network and a particular message.
A. application
B. unit
C. network
D. switching
ITU-T规定对于任意级别的STM-N帧,帧频都是8000帧/秒,也就是帧的周期为恒定的125us,那么STM-1的信息净负荷传送速率为( )。
A. 270×9×8bit×8000=155 .520Mbit/s
B. 9×9×8bit×8000=5.184Mbit/s
C. 261×9×8bit ×8000=150.336Mbit/s
D. 3×9×8bit×8000=1.728Mbit/s