In the OSNR model for EDFA amplifiers， SNR OUT = 1/（1/SNR IN + FhvB/P IN ），  what does SNR IN represent？（）

相似题目

• The first P in the PPP teaching model stands for____, which aims to get learners to perceive the form and meaning of a structure.

  A . practice B . production C . presentation D . preparation

  查看最佳答案

• Look! The boy （）a model ship and he （） it in the lake now.

  A . made；is sailing B . has made；is sailing C . made；sails D . has made；sail

  查看最佳答案

• Which QoS model manages the QoS requirements for the network on a per-hop behavior （PHB） basis？（）

  A . best-effort delivery B . ingress committed rate （ICR） C . shaping and policing D . egress committed rate （ECR） E . Integrated Services （IntServ） F . differentiated services （DiffServ）

  查看最佳答案

• In the 7-layer OSI model, which layer switching will take place?（）

  A . Layer one B . Layer two C . Layer three D . Layer four

  查看最佳答案

• In the OSI model, at which layers do WANs operate at?（）

  A . Applicationlayer B . Presentationlayer C . Sessionlayer D . Transportlayer E . Networklayer F . Datalinklayer G . Physicallayer

  查看最佳答案

• Which layer in the OSI reference model is responsible for determining the availability of the receiving program and checking to see if enough resources exist for that communication? （）

  A . transport B . network C . presentation D . session E . applicatio

  查看最佳答案

• What information, in addition to model number and serial number, is necessary to perform featureactivation for the IBM System Storage DS8000?（）

  A . Machine signature B . Customer number C . Site location D . Customer contact number

  查看最佳答案

• In the communications industry, what are the features and benefits of using the layered OSI model?（）

  A . It encourages industry standardization by defining what functions occur at each layer of the model. B . It necessitates changes in functionality in one layer to other layers. C . It enables equipment efficiency from different vendors to use the same electronic components. D . It divides the network communication process into smaller and simpler components, thus aiding component development, design, and troubleshooting. E . It supports the evolution of multiple competing standards, and thus enhances business equipment manufacturing opportunities.

  查看最佳答案

• The first P in the PPP teaching model stands for＿＿，which aims to get learners to perceive the form and meaning of a structure.

  A . practice B . production C . presentation D . preparation

  查看最佳答案

• What are five of the seven layers that are found in the OSI model?（）

  A . session B . physical C . protocol D . gateway E . data link F . transport G . applicatio

  查看最佳答案

• Which statement describes the distributed call control model in VoIP networks？（）

  A . The gateway voice-capable device is configured to support call control directly performing call setup， call maintenance， and call teardown B . The gateway voice-capable device has a local call routing table configured through a routing protocol. C . The gateway voice-capable device relies on a call agent to support call control. D . The gateway voice-capable device relies on a gatekeeper to support call setup， call maintenance， and call teardown.

  查看最佳答案

• Which two statements about the best effort model for QoS are true？（）

  A . delay sensitive packets are given preferential treatment B . the default policy identifies a delay sensitive class and default class C . the default policy identifies a delay sensitive class， best effort class， and default class D . the model is highly scalable E . the model is still predominant on the internet F the model provides guaranteed service

  查看最佳答案

• In the OSNR model for EDFA amplifiers, SNR OUT = 1/(1/SNR IN + FhvB/P IN ), what does SNR IN represent?（）

  A . the signal to noise of the current optical amplifier B . the signal to noise of the previous amplifier or source C . the signal to noise introduced by the optical multiplexer D . the accumulated noise to signal ratio of the optical channel

  查看最佳答案

• The Unified Modeling Language is a standard graphical language for modeling object-oriented software（）can show the behavior of systems in terms of how objects interact with each other.

  A . Classdiagram B . Componentdiagram C . Sequencediagram D . Use case diagram

  查看最佳答案

• The model for stages of life has changed in the last 40 years because____.

  查看最佳答案

• For the left hand of the two hand model, which lifestyle factor is NOT in the model?

  查看最佳答案

• In the Black Scholes Model, which factor represents the volatility of the cash flow?

  查看最佳答案

• Which of the following is the final step of the Decide Model for effective risk management and Aeronautical Decision Making? （ ）

  查看最佳答案

• The main difference between waterfall model and evolutionary model is in（)

  A.different activities B.different project size C.different project management manner D.different way of activity organization

  查看最佳答案

• In the OSI model, at which layers do WANs operate at？（）

  A．Applicationlayer B．Presentationlayer C．Sessionlayer D．Transportlayer E．Networklayer F．DatalinklayerG.Physicallayer

  查看最佳答案

• 在波分系统中，经常提到的DWDM的中文意思是（);EDFA的中文意思是（);OSNR的中文意思是（)。

  查看最佳答案

• African Americans have been called the “model minority” in the United States due to t

  是 否

  查看最佳答案

• What are the reasons for skinny models to be prefered by designers?

  A．This is to foster eating disorder among the models. B．Clothes looks better on thin models. C．This is to be deliberately different from normal women. 此题为多项选择题。

  查看最佳答案