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• tzy789 2021-03-29

下列哪个参数描述帧中继网络使用PVC传输数据的承诺信息速率（ ）。

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• 176****8203 2021-03-27

In the microwave transmission,the rain attenuation are calculated by two directions. ( )

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• 姚建龙 2021-03-27

电信执照理论考试百分制成绩在 60分(含)以上的，为理论考试合 格。( )

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• 1234567 2021-03-27

Digital microwave systems can be used for telephone, data, image, video and other new communication services. ( )

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• 路人甲 2021-03-27

The remote communication of the microwave relay communication is realized by sight propagation of microwave in the forms of relay. ( )

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• 24k 2021-03-27

The opti al communication consists of transmitter,fiber and receiver. ( )

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• 苦短 2021-03-27

TDM, WDM make contributions to enhancement of optical fiber transmission capacity. ( )

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• 青云 2021-03-27

The feature of optical fiber is high bit rate and short transmission distance (

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• Yohann 2021-03-27

Physical, or MAC addresses, usually are assigned by the network administrator. ( )

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• 野百合也有春天 2021-03-27

A router can have many different types of interface ports. ( )

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• 叫地主 2021-03-27

Router has two primary purposes: path selection, and switching of packets to the best route. ( )

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• ahahsh 2021-03-27

CM audio signal is encoded as 8000 an/alog samples per second，of 8 bits each，giving a 64kbit/s digital signal known as DS0. ( )

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• quyu1 2021-03-27

One PCM frame period is 125us. ( )

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• 阿银。 2021-03-27

PCM E1 divided into 32 timeslots. (

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• 奈尔伽姆 2021-03-27

A router is a device that operates at the Network layer of the OSI model to connect dissimilar networks. (

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• Jamesjin 2021-03-27

A protocol is the set of rules or conventions governing the way in which two entities cooperate to exchange data. ( )

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• Tate 2021-03-27

When the cluster system is seriously fault and can not work normally, the system will step into fault weakening state. ( )

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• victory 2021-03-27

Networking makes help for reducing the number of connections. ( )

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• MEISHAONV 2021-03-27

In the clusters communication system, the user uses fixed frequency while calling.The user station can only be turned to a certain frequency, work in this channel.If the channel is occupied, the station not be able to automatically select other idle channel to work. ( )

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• 010203 2021-03-27

Cluster base station is mainly composed of several transponders and antenna feeder system. ( )

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