【名词&注释】
电信网(telecommunication network)、数据检索(data retrieval)、终端设备(terminal equipment)、动态分配(dynamic allocation)、电话网(telephone network)、数字网(digital network)、话务员(information operator)、无条件转移(unconditional branch)
[单选题]数据检索业务是用户通过（）进行国际、国内的计算机库查找和选取需要的文献、数据和图像的业务。
A. 综合业务数字网(digital network)
B. 公用电信网
C. 智能网
D. 数字数据网
查看答案&解析
举一反三：
[单选题]电话网是由交换设备、传输设备和（）三部分所组成。
A. 接入设备
B. 终端设备
C. 测试设备
D. 转换设备
[单选题]非零色散位移单模光纤也称为（）光纤，是为适应波分复用传输系统设计和制造的新型光纤。
A. 652
B. 653
C. 654
D. 655
[单选题]国际长途直拨国外话务员(information operator)受付业务是指用户利用普通程控话机，通过拨一特种号码 ( ) ，直接拨通受话国电话公司话务员(information operator)，并用受话国语言接通的电话业务。
A. 108
B. 160
C. 168
D. 1000
[单选题]下列关于ATM特点的描述中，错误的是（ ）。
A. 采用短而固定长度的分组，分组长度为53字节
B. 采用同步时分复用技术，实现按需动态分配带宽
C. 采用面向连接的信息传送方式
D. 取消了网络内部节点链路上的差错控制和流量控制，实现了高速交换和传输
[多选题]4G is one of those terms that keep coming back through marketing brochures for what the latest technologies happen to be in the cellphone market. Every carrier claims to have true 4G, and has been claiming that for years, regardless of what they actually use. The reason was simple because the real 4G specification, expected to be drafted by the International Telecommunication Union, was no where to be found. In fact, the ITU took way longer than being expected to come up with a decision, likely because of massive lobbying campaigns. After all, which company wants to have to redesign its entire network just to be able to keep saying they are 4G? Now however, they ITU has decided itself.What does this mean for carriers and users? First，let’s see what 4G really is. As expected, LTE is central to the ITU strategy,but more precisely,the organization went with LTE-Advanced,which is a stricter version of traditional LTE. To qualify as 4G，a network has to provide 100Mbps connections over wireless,and 1 Gbps over wired. The whole network has to be fully IPv6 compliant. Frequencies have to be variable over 40MHz to avoid interference. Finally, global roaming has to be seamless, along with transitions between wirless and wired connections. This is a real step forward, and a good decision, which ensures that real 4G services will meet a good level of services. Technically, LTE-Advanced is just one of two new standard that are now under the umbrella called IMT-Advanced. The other one is WiMAX 2 which is a further refinement of the WimMAX protocol. Based on the paragraph above，to qualify as 4G, a network has to satisfy （） criteria. The transitions between wireless and wired connections have to be （）. LTE-Advanced is a standard belonging to （）.
A. two
B. three
C. four
D. five A．limited
E. possible
F. seamless
G. deployed A．WiMAX
H. WiMAX 2
I. IPv6
J. IMT-Advanced
[单选题]GSM中的信道分为物理信道和（）。
A. 逻辑信道
B. 广播信道
C. 业务信道
D. 控制信道
[单选题]ASON技术的最大特点是引入了（）。
A. 管理平面
B. 控制平面
C. 业务平面
D. 传送平面
[单选题]当甲用户正在与乙用户通话时，丙用户呼入，甲可根据需要保留其中一方，与另一方通话，此业务是（）
A. 呼叫等待
B. 无条件转移(unconditional branch)
C. 三方通话
D. 无条件等待
[单选题]用户远程登录到另一台计算机上运行程序，可使用（）工具或软件。
A. Telnet
B. N
C. FS
D. SNMP
F. FTP
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