目前已经投入使用的系统是按照32X2.5G的系统设计的，如果要升级_爱下问搜题

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问题问答题简答题

目前已经投入使用的系统是按照32X2.5G的系统设计的，如果要升级为32X10G的系统，你认为不中断业务的条件下是否可行？请给出你的理由

答案

参考答案：

风险是非常大的不中断业务几乎是不可能的，32X2.5G的系统除了超常跨距需要考虑色散外，一般激光器的色散容限是12800ps/nm足以实现无电中继的640Km的传输，而在10G系统中，10G单板的色散容限最大也就1600ps/nm即无电中继最长的传输距离也只有80KM，那么就需要将原来的系统按照10G的系统来重新设计，配置DCM来抑制色散带来的系统频谱展宽。信噪比需要进行重新预算，传输速率越高需要更高的信噪比来正确的接收信号，因此对于32X10G系统来将需要采用FEC/AFEC和ERZ等技术来降低系统对信噪比的要求。从系统的角度来讲，需要采用增益均衡技术，保证各波长的增益一致性和各信道的信噪比满足要求。从配置的角度将需要更改配置。

完形填空

Children find meanings in their old family tales．
When Stephen Guyer’s three children were growing up, he told them stories about how his grandfather, a banker,   1  all in the 1930s, but did not lose sight of what he valued most. In one of the darkest times   2  his strong-minded grandfather was nearly  3  , he loaded his family into the car and   4   them to see family members in Canada with a   5  , “there are more important things in life than money”.
The   6  took on a new meaning recently when Mr. Guyer downsized to  7   house from a more expensive and comfortable one. He was 8     that his children, a daughter, 15, and twins, 22, would be upset．To his surprise, they weren’t. 9     , their reaction echoed (共鸣) their great-grandfather’s．What they 10   was how warm the people were in the house and how 11    of their heart was accessible.
Many parents are finding that family stories have surprising power to help children
  12   hard times. Storytelling experts say the phenomenon reflects a growing   13    in telling tales, evidenced by a rise in storytelling events and festivals.
A university   14   of 65 families with children aged from 14 to 16 found kids’ ability to 15  parents’ stories was linked to a lower rate of anger and anxiety.
The 16  is telling the stories in a way children can 17   . We’re not talking here about the kind of story that 18  , “ When I was a kid, I walked to school every day uphill both ways, barefoot in the snow.” Instead, we should choose a story suited to the child’s 19 , and make eye contact (接触) to create “a personal experience”. We don’t have to tell children 20   they should take from the story and what the moral is.

C．arrangement

C．disappointed

A．talked about

B．cared about

C．wrote about

D．heard about

单项选择题

急性腹膜炎伴有休克患者宜采用的体位是

A．头低脚高位
B．头抬高20°～30°，脚抬高15°～20°
C．半卧位
D．平卧位
E．侧卧位