对应课程:点击查看
起止时间:2021-03-15到2021-07-17
更新状态:每5天更新一次
Task 1 Cognition of Optical Fiber Communication System Test 1
1、 The production material of optical fiber is ( )
A:Copper
B:Iron
C:Compound
D:Quartz
答案: Quartz
2、 The three wavelengths used in optical fiber communication are ( )
A:λ=0.85um，λ=1.20um，λ=1.80um
B:λ=0.80um，λ=1.51um，λ=1.80um
C:λ=0.85um，λ=1.31um，λ=1.55um
D:λ=0.85um，λ=1.20um，λ=1.80um
答案: λ=0.85um，λ=1.31um，λ=1.55um
3、 The function of the photodetector is ( )
A:Convert an optical signal into an electrical signal
B:Convert an electrical signal into an optical signal
C:Amplify electrical signal
D:Amplify optical signal
答案: Convert an optical signal into an electrical signal
4、 The spectrum of optical fiber communication belongs to ( )
A:Visible light
B:Ultraviolet light
C:Infrared light
D:X-ray
答案: Infrared light
5、 Optical fiber can be connected directly without special tools.
A:正确
B:错误
答案: 错误
Task 2 Designing an Ideal Optical Transmission Model Test 2
1、 Which of the following is a dispersion-shifted single-mode fiber?
A:G.652
B:G.653
C:G.654
D:G.655
答案: G.653
2、 Threshold current of laser should be ( )
A:The larger the better
B:The smaller the better
C:Both OK
D:No impact
答案: The smaller the better
3、 The following ( ) is part of the optical receiver
A:ATC
B:AGC
C:APC
D:ARC
答案: AGC
4、 Which is not the advantage of EDFA?
A:High coupling efficiency
B:High gain and low noise
C:The gain characteristic is sensitive.
D:High energy conversion efficiency
答案: The gain characteristic is sensitive.
5、 The laser is a new type of light source because of its concentrated emission direction, high brightness, superior coherence and good monochromaticity.
A:正确
B:错误
答案: 正确
Task 3 Cognition of SDH transmission network Test 3
1、 For STM-16 signals, RSOH monitors the transmission performance of
A:STM-N frame
B:STM-1
C: STM-4
D:STM-16
E:STM-64
答案: STM-N frame
2、 The optical interface of the digital synchronous transmission system adopts the () code type
A:scrambled NRZ code
B:NRZ code
C: scrambling code
D:HDB3 code
E:CMI code
答案: scrambled NRZ code
3、 In the PDH system, which of the following rates uses synchronous multiplexing
A:64kbit/s
B: 2048kbit/s
C:34Mbit/s
D: 140Mbit/s
答案: 64kbit/s
4、 A VC-4 slot contains ( ) VC-3 slot, and each VC-3 can hold ( ) 34m signals.
A: 1,3
B: 1,1
C: 3,1
D: 3,3
E: 2,3
答案: 3,1
5、 () is used to identify the starting position of the frame
A: A1、A2
B:B1、B2
C: D1、D2
D: E1、E2
E:F1、S1
答案: A1、A2
6、 In the STM-1 frame structure, the net load area is located in
A:10~270 column, 1~ 9 row
B:10 ~270 column, 1~3 row.
C: 1 ~ 3 column, row 4
D:1 ~ 9 column, row 4
E: 1 ~ 9 column, 5 ~ 9 row
答案: 10~270 column, 1~ 9 row
7、 The PDH branch signal of 8Mbit/s can be multiplexed into STM-N signal
A:正确
B:错误
答案: 错误
8、 Whether it is STM-1, STM-4 or STM-16, the frame rate is 8000 frames per second
A:正确
B:错误
答案: 正确
9、 The 5-8 bits of S1 bytes represent different clock quality levels of ITU-T. The higher the value of S1, the higher the clock quality level.
A:正确
B:错误
答案: 错误
10、 SDH can not achieve “one step” low-speed signal add-drop and multiplexing
A:正确
B:错误
答案: 错误
11、 The rate of STM-16 is about 2.5Gb/s
A:正确
B:错误
答案: 正确
12、 The band efficiency of SDH system is relatively high
A:正确
B:错误
答案: 错误
13、 DCC bytes can complete the function of data communication path.
A:正确
B:错误
答案: 正确
Task 4 SDH transmission equipment networking Test 4
1、 The OIB1D optical plate in ZXMP S320 equipment has () light directions
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