正确答案: ABCD

GSM CDMA DAMPS JDC

题目：数字蜂窝移动通信系统的标准有（）。

解析：ABCD

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学习资料的答案和解析：

[单选题]Nobody had predicted the scale of impact of （ ） communications and that it world be one of the largest businesses in the history of mankind with and immense impact on all economies.[1分]

cellular

[单选题]采用（ ）后， TUP 部分就可以不用。

ISUP

[多选题]【Recently， telecommunication carriers has been building All-IP core networks in order to effectively support various kinds of fixed and mobile broadband services，such as up-and down-loading You tube and SNS（Social Networking Services）with rich video file，as well as broadband mobile Internet services. Such All-IP network is called NGN（Next Generation Network），which guarantees secure authentication and QoS such as the bandwidth and the delay. From the service point of view，convergence of fixed and mobile communications，known as FMC（Fixed Mobile Convergence）is becoming a key increasing new services and expanding the market.】 Form the paragraph above，we can see that（）can be defined as a network that can effectively support various kinds of fixed and mobile broadband services，with guaranteed QoS in terms of（）and etc. And the key to develop new services and gain larger market share should be（）

NGN

social network A．data rate

availability

band width， delay A．mobile communications

All-IP core network

解析：C,D,D

[单选题]在ATM中，信息被组织成固定长度的信息单元，叫做（）。

信元