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1. 以下关于 100G 相干 PDM-QPSK 调制的说法不正确的是?
A) QPSK调制的本质是通过在光场相位中选择4个可能的值,在不降低线路速率的情况下,将光信号的波特率降低一半。
B) 采用PDM偏振复用技术,非线性耐受性优于
40GePDM-BPSK。
C) PDC-QPSK支持DCMfree和DCM系统应用,支持现有10G/40G网络平滑升级到100G系统。
D) PDM-QPSK技术是100G传输的主要调制码技术,可以将112Gb/s的线路速率降低到28Gbaud/s的波特率,大大降低对(光)电设备的借贷需求。
2. 当数据链路层使用以太网时,数据帧的封装格式包括目的MAC、源MAC、TYPE和FCS字段。当TYPE字段的值为0x0806时,表示封装的内包是以下哪种协议?
A) IP
B) ICMP
C) ARP
D) IPX
3. 下列关于网络保护倒换测试的描述不正确的是?
A) 线性复用段保护倒换时,网元上报APS_INDI和MS_APS_INDI_EX告警
B) 复用段保护倒换测试有两种方法:单端环回测试法和双端挂表测试法
C) 配置了SNCP保护。关闭对端接口的激光器后,观察本端SDH分析仪。
D) 测试前需要将1:1线性复用段保护模式设置为单端倒换。
4. APD型接收光头的过载光功率仅为-9dBm,尤其要注意防止因功率过大而烧毁光模块。
A) 真
B) 错误
5. 1310nm 和 1550nm 传输窗口都是低损耗窗口。在 DWDM 系统中,只有
使用 1550nm 传输窗口。以下哪个选项是主要原因?
A) 1550nm波长区域适合长距离传输
B) EDFA 工作波长平坦区包括该窗口
C) 1550nm 波长范围内的小非线性效应
D) 1550nm窗口损耗小于1310nm窗口
Solutions:
| Question # 1 Answer: B | Question # 2 Answer: C | Question # 3 Answer: D | Question # 4 Answer: A | Question # 5 Answer: B |
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