HCIA-Transmission V2.5 H31-311_V2.5 Exam Dumps

dumps2023-04-25T11:54:17+08:00

HCIA-Transmission V2.5 H31-311_V2.5 exam is available online. Many Huawei candidates would like to take this test. The real Huawei H31-311_V2.5 exam contains 60 items, including Single-answer Question, Multiple-answer Question, True or false, Short Response Item, Drag and Drop Item. Each candidate has 90 minutes to finish the test. The passing score is 600/1000. The test languages are English and Chinese. With our HCIA-Transmission V2.5 H31-311_V2.5 exam dumps, you will not waste your registration fee. Study free Huawei H31-311_V2.5 exam dumps below.

Page 1 of 15

1. FAS is the frame alignment overhead, the length is 6 bytes, and it is located in the 1st to 6th columns of the first row. The 1st to 3rd bytes are 3 OA1 bytes, and each OA1 is always "1111 0110", that is, 16 F6 in hexadecimal; the 4th to 6th bytes are 3 OA2 bytes, and each OA2 is always "0010 1000", that is, 28 in hexadecimal.

True

False

2. The LDG supports electrical layer scheduling at the ODU1 level.

True

False

3. The number of network elements (including REG) in the two -fiber bidirectional multiplex section sharing protection ring can exceed 16.

True

False

4. In Ethernet, the frame length has a lower limit, which is mainly due to which of the following considerations?

Carrier Sense

Multi-point access

Conflict detection

Improve network bandwidth utilization

5. When the PM segment of the ODUk generates seriously errored seconds, the network management will report the ODUk_PM_ES alarm.

True

False

6. If a network port that supports auto-negotiation is connected to a network port that does not support auto-negotiation, half-duplex to full-duplex may occur.

True

False

7. Which of the following options are in the low-loss area of single-mode fiber? (Multiple choice)

1310nm _

900nm

1550nm

1200nm

8. What are the following steps for low-speed services to be multiplexed into high-speed SDH services? (Multiple choice)

Mapping

Overhead Insertion

Positioning

Multiplexing

9. OSN 3500 branch line business has strong up and down capabilities, with 16 branch line outlet slots, 504 2M, 32 E4, 117 E3/DS3, 132 STM-1e up and down subracks, providing STM-1/4/ 16/64 group rate.

True

False

10. The levels of forced switching, fiber cut switching, manual switching, and practice switching are arranged from high to low.

True

False

Page 2 of 15

11. Physical port: also known as MAC port, is the external port of the board.

True

False

12. Which of the following is not included in the basic architecture of MPLS L2VPN?

Tunnel

S-VLAN

13. If a bit error is detected in the B1 byte, which of the following alarms will be reported by the peer end?

MS-AIS

RS-BBE

RS-FEBBE

Not reporting

14. For the OSN6800 device, which of the following slots does not have an electrical layer crossover backplane bus?

Slot1

SIot9

SIot10

SIot17

15. Complex flow classification refers to classifying packets according to the ToS (Type of Service ) field of IP packets , user priority or EXP field of MPLS packets to identify traffic with different priority characteristics.

True

False

16. The communication network can be divided into local area network and wide area network according to the geographical scope it covers, and a metropolitan area network between the local area network and the wide area network. The wide area network is characterized by low delay, high data rate and reliable transmission.

True

False

17. The advantages of WDM mainly include the following. (Multiple choice)

Large capacity, " transparent" transmission of data

The system is easy to upgrade, and the existing investment can be protected to the greatest extent when upgrading

Can fully replace SDH equipment

Compatible with future all-optical switching networks

High networking flexibility, economy and reliability

18. The dispersion coefficient is the delay difference caused by the optical wavelength signal passing through the unit length of optical fiber in the unit wavelength interval, so which of the following is the unit of the dispersion coefficient?

ps/nm

ps/km

ps/nm.km

ps/km.nm

19. When inserting LCK to the ODUk signal at the local end, what processing will the downstream station system not perform?

Report ODUk_PM_LCK alarm

Download ODUk_AIS information

Return ODUk_PM_BDI

Insert ODUk_PM_LCK alarm

20. Which of the following is related to pointer adjustment?

clock

Speed

Expenses

Scrambling

Page 3 of 15

21. Which of the following statements about reuse is correct?

In the process of byte interleaved multiplexing, the information payload and pointer bytes of each frame are interleaved and multiplexed according to the original value, and the segment overhead is also multiplexed accordingly.

There will be 4 times the overhead in STM-1 in STM-4

The overhead in STM-4 is newly integrated and has only one set of overhead

The amount of overhead in STM-4 is the same as in STM-1

Overhead random generation in STM-4

22. The U2000 client supports installation on Windows, Solaris, and SUSE Linux operating systems.

True

False

23. The optical monitoring channel is set up for the monitoring of the WDM optical transmission system. ITU-T recommends that the wavelength of 1510nm is preferred, and the capacity is 2MHz/s .

True

False

24. The half-duplex mode must have a collision detection and avoidance mechanism to avoid the situation where multiple devices seize the line at the same time. This mechanism is the so-called CSMA/CD, and the Chinese name is carrier sense multiple access/collision detection .

True

False

25. The current sparse wavelength division multiplexing system generally works in the band from 1271nm to 1611nm. Which of the following is the channel spacing?

10nm

5nm

20nm

18nm

26. Compared with traditional SDH and SONET equipment, which of the following advantages does OTN have? (Multiple choice)

Meet the transmission bandwidth requirements of each optical Tb/s through the wavelength division function

Provide 2.7G b /s, 10.7G b /s, 43G b /s and even 111.8G b /s high-speed interface

Provide up to 5 levels of nested overlapping TCM connection monitoring

Support virtual concatenation transmission mode to improve and optimize the network structure

Provide a powerful out-of-band FEC function, which effectively guarantees the line transmission performance

27. The most effective subnet mask for a point-to-point WAN link is 255.255.255.252 .

True

False

28. The OSN 7500 supports a maximum of 2M service boards. Which of the following is correct.

29. Which of the following alarms is not a switching condition for a two- fiber bidirectional multiplex section protection ring?

R_LOS

MS_AIS

TU_AIS

B2_EXC

30. Which of the following are the main functions of U20 0 0 network management? (Multiple choice)

a. topology management

B. Performance management

C. Troubleshooting

D. End-to-end business management

Page 4 of 15

31. Both QinQ and MPLS can provide users with L2 VPN service, but QinQ is cheaper and easier than MPLS.

True

False

32. Which of the following descriptions of MPLS is incorrect? (Multiple choice)

MPLS: Multi-protocol Label Switching, a non-standardized routing and switching technology platform

P/PE: P (Provider) is the internal node of the MPLS network, and PE (Provider Edge) is the edge of the MPLS network c. The operation of PE->P is Egress, adding MPLS labels to client signals

The operation of P->P is Ingress, which exchanges MPLS labels

33. Which of the following is the database used by U2000 on PC/WIN2003?

Sybase

Microsoft SQL Server 2000

Foxpro

DB2

34. Which of the following is correct for optical amplifiers and regenerators? (Multiple choice)

Higher regenerator cost

When the regenerator works at a specific bit rate and a specific frame format

Where the amplifier can work at any bit rate and frame format

Optical amplifiers are rarely used, and regenerators are commonly used

35. The frame structure of ODU4 is four times that of ODU1.

True

False

36. The SDH equipment can judge the quality of the clock signal according to the S 1 byte. The larger the value of S 1 is, the higher the quality of the corresponding clock is.

True

False

37. Which of the following elements does a data communication network have in terms of equipment? (Multiple choice)

Terminal equipment

Transmission system

Switching devices

Core equipment

38. MPLS is a label forwarding technology, which of the following was originally designed for?

Increase the utilization rate of IP addresses

Increase the forwarding speed of the router

Reduce network latency

Avoid broadcast storms

39. R-LOS, R-LOF, AU-AIS, TU-AIS alarms are all generated and reported on the circuit board.

True

False

40. All bytes in the SDH frame structure will be scrambled.

True

False

Page 5 of 15

41. Chromatic dispersion includes material dispersion and waveguide dispersion. Generally, only material dispersion and waveguide dispersion are considered in single-mode fiber.

True

False

42. QinQ technology can be interpreted as 802.1Q in 802.1Q, in other words, a layer of 802.1Q label is added on top of the 802.1Q label , the outer layer is C-VLAN and the inner layer is S-VLAN , two bytes more than a normal 802.1Q frame .

True

False

43. What are the differences between the AU pointer and the TU pointer? (Multiple choice)

The scope of the instruction is different

The number of bits occupied by the pointer value is different

The bytes stored in the pointer value are different

The unit of adjustment is different

44. The SDH network is composed of multiple network nodes (network elements) connected to each other through optical fibers; network topology generally refers to the shape of the network, that is, the geometric arrangement of network nodes and transmission lines, which reflects the logical connection of the network.

True

False

45. Regarding the processing of data frames by the data board port, which of the following is correct? (Multiple choice)

The port set as the tag Aware attribute can only discard the data without vlan tag

Hybrid ports can realize mixed transmission of tag and untag services

When the Ethernet port is set to Tag aware, there is no need to set the default VLAN of the port ID, the default VLAN ID of the port needs to be set only when it is set to Access

46. After mapping and multiplexing, 4 channels of ODU2 signals can be multiplexed into 1 channel of OTU3[ V ] signal, while for ODU2e signal, only 3 channels are needed to be multiplexed into 1 channel of OTU3 [V] signal.

True

False

47. Which of the following situations can cause the board to reinsert the BDI maintenance signal to the upstream site? (Multiple choice)

The board reports R_LOS

Report OTU2_DEG on the board

Report OTU2_LOF on the board

ODU2_PM_LCK

48. K1 and K2 bytes can transmit APS switching signaling, and can also indicate that the signal of the multiplex section is invalid.

True

False

49. Which of the following is the monitoring overhead for monitoring and reporting OTUk_DEG and OTUk_EXC alarms?

TCMi

50. Which of the following statements is incorrect.

In the connection model of MPLS VPN, the network is composed of the backbone network of the operator and each site of the user. The so-called VPN is the division of a site set, and a VPN corresponds to a set composed of several sites.

The network construction of MPLS VPN is completed by the service provider. In this network structure, the service provider provides VPN services to users, and users do not feel the existence of a public network, as if they have independent network resources.

For the backbone routers inside the backbone network of the service provider, that is, the routers that are not directly connected to the edge routers, they do not know the existence of the VPN, and are only responsible for data transmission within the backbone network.

All VPN construction, connection and management work is carried out on the backbone router.

Page 6 of 15

51. QinQ technology is a technology of VLAN nesting. QinQ complies with IEEE 802.1q recommendations, and it is also a technology of VLAN extension.

True

False

52. Which of the following boards supports the QinQ function?

EFT8

EGT2

EMS4

EMR2

53. If a bit error occurs in the SDH network, the service signal recovered after the signal is decapsulated must have a bit error.

True

False

54. The comb filter is an active optical device, its main function is to couple or separate odd and even waves in the same band.

True

False

55. Which of the following descriptions are correct? (Multiple choice)

The difference between a 1+1 linear multiplex section and a 1:1 linear multiplex section is whether APS is required.

The 1:1 linear multiplex section can be equipped with additional services, and its switching mode is only double-ended recovery switching.

Whether it is a two-fiber bidirectional MSP ring protection ring or a four-fiber bidirectional MSP ring, there are requirements for the nodes in the ring. The main reason is that it is determined by the K1 and K2 bytes in the APS protocol.

The APS protocol of the four-fiber bidirectional multiplex section protection ring is carried by the protection optical fiber.

The protection mode of SNCP protection is " double transmission, selective reception", which is especially suitable for decentralized services.

56. TM is a terminal multiplexer. Its function is: the line port inputs/outputs one STM-N signal, and the branch port can output/input multiple low-speed branch signals.

True

False

57. If a bit error is detected in the B2 byte, the peer end will report the following alarm.

MS-AIS

RS-BBE

MS-FEBBE

MS-BBE

58. The physical layer of LAN is often used for the interconnection of routers and switches. Although it is called a local area network, if a 10GBase-LR or -ER optical module is used, the transmission distance can reach 80 kilometers.

True

False

59. Which of the descriptions about the FIU board is correct?

The FIU board processes monitoring information.

FIU can complete the access and solution of OSC channel.

In OptiX OSN 880 0 equipment, when there is no signal input, the FIU board will report an alarm.

Whether it is an OLA station or an OADM station, a station only needs one FI

60. The maximum transmission distance of Ethernet depends on factors such as line quality and signal attenuation .

True

False

Page 7 of 15

61. 1000BaseSX adopts single-mode fiber, and uses light with a wavelength of 1300nm working window to transmit services.

True

False

62. The number of bytes of segment overhead in STM-1, STM-4, STM-16, and STM-64 frame structures is the same .

True

False

63. OSN 3500 supports 2 10G slots when GXCSA is used, and 4 10G slots when E X CSA is used.

True

False

64. Which of the following time period information is loaded into the 2M signal in the multiframe?

500us

125us

500ms

125ms

65. In terms of protection capability, which of the following topological structures has the strongest protection capability?

Linear topology

Star topology

Tree topology

Ring topology

Mesh topology

66. Which of the following is the role of overhead TCM in ODUk?

Channel Monitoring Overhead

Path Trace Identifier Overhead

Tandem Connection Monitoring Overhead

Generic communication channel overhead

67. Which of the following is the main structure of the WDM system with N-channel wavelength multiplexing? (Multiple choice)

Optical wavelength conversion unit

WDM unit

Optical amplification unit

Monitoring unit

Intersection unit

68. The basic actions for label forwarding in MPLS network include PUSH, SWAP and PHP.

True

False

69. When the optical signal propagates in which of the following optical fibers, the phenomenon of four-wave mixing is the most serious, and the transmission damage caused is also large?

AG652

BG655

CG653

DG654

70. The SDH signal needs to be scrambled before being transmitted on the optical fiber. Which of the following bytes are not scrambled? (Multiple choice)

Page 8 of 15

71. The transmission speed of STM-4 is constant equal to 4 times of STM-1 signal transmission speed, STM-16 is constant equal to 4 times of STM-4 and 16 times of STM-1.

True

False

72. Compared with traditional SDH and SONET equipment, OTN has up to 6 levels of TCM monitoring capabilities .

True

False

73. According to the calculation formula of OUTk signal rate: OTUk rate = 255/(239-k) xSTM -N frame rate , so the rate of OTU4 signal is 255/235 x 99 532800 kbit /s .

True

False

74. The current 32-bit IP address is not enough, and the MPLS label is only 20 bits, so the MPLS label will not be enough as the network becomes larger.

True

False

75. Only the external port can set the Tag attribute, and the internal port cannot set the Tag attribute.

True

False

76. Which of the following statements is correct about the alarm caused by the mismatch? (Multiple choice)

J0 byte mismatch will generate RS -TI M alarm

C2 byte mismatch will generate HP-UNEQ alarm

J1 byte mismatch may also cause service interruption

All of the above are correct

77. The MAC address of the computer network card is uniformly assigned to each manufacturer by the IETF, and is unique in the world.

True

False

78. Which of the following reasons will not cause the network management to report the MUT_LOS alarm?

The OTU board is faulty

The out port of the DMUX board is faulty

The fiber pigtail connecting the out port of the DMUX board and the in port of the OA board is faulty

The in port of the OA board is faulty

79. The PM overhead byte is not processed at the electrical relay site, but the SM overhead needs to be processed at the electrical relay site.

True

False

80. The SDH frame structure is a rectangular block frame with which of the following options as the unit?

bytes

bit c. block

frame

Page 9 of 15

81. The RAMAN amplifier utilizes which of the non-linear effects?

Self-Phase Modulation

Dispersion

Raman scattering

Four-wave mixing

82. What are the main technical indicators for measuring filters? (Multiple choice)

Insertion loss

Bandwidth

Power Consumption

Crosstalk

83. Which of the following bytes is the negative adjustment position of the TU pointer?

84. U2000 provides physical view, layer 2 view, RPR view, IP view, cluster subnet and MPLS TE view, which can be browsed from different angles.

True b. wrong

85. Compared with the dense wavelength division multiplexing system, the sparse wavelength division multiplexing system greatly reduces the cost of the system while providing a certain number of wavelengths and a transmission distance within 100 kilometers, and has very strong flexibility.

True

False

86. Which of the following is the maximum number of OSN 2500 subracks that can be placed in a 2.2m cabinet?

87. One-way ring means that under normal network conditions, the routes of business sending and receiving are inconsistent. We call the business of separating routing as one-way business.

True

False

88. Local area network is a network formed by interconnecting various communication devices in a small area. Its characteristics are: short distance, small delay, high data rate, and reliable transmission.

True

False

89. Pointers in addition to positioning can also accommodate differences in frame rate to a certain extent.

True

False

90. Among the following proposals, which of the following agreements are relevant to WDM? (Multiple choice)

671

681

691

692

Page 10 of 15

91. The subnet mask is a 32-bit address consisting of a string of 1s followed by a string of 0s, such as: 255.255.0.255 is a valid subnet mask.

True

False

92. When 172.17.15.0 / 24 uses 4 extra bits for subnetting, which of the following addresses are legal subnet addresses? (Multiple choice )

172.17.15.0

172.17.15.8

172.17.15.40

172.17.15.96

172.17.15.248

93. The two- fiber ring topology composed of three network elements is arranged in counterclockwise order as A, B, and C. The services between A and C occupy the 48th VC in the first VC-4 on the short-path line -12 time slots, then the business between B and C can also occupy the 48th VC-12 time slot in the first VC-4 on the short-path line , then which of the following is the ring network protection subnet type?

Unidirectional channel protection ring

Subnet connection protection ring

Bidirectional MSP protection ring

All of the above are possible

94. Which standard encapsulation protocols are defined in MSTP? (Multiple choice)

HDLC

ML-PPP

LAPS

GFP

95. The process from C4 to VC4 in the multiplexing process is rate adaptation.

True

False

96. In QinQ, the TPID value of the inner and outer labels of the device adopts the protocol - specified 0x8100, and this value cannot be changed. If it changes, the frame will be discarded.

True

False

97. For monitoring channel, OSC and ESC can coexist in one network.

True

False

98. The HUB is a multi-port transponder. When the HUB is the central device, if a certain line in the network fails, it will not affect the work of other lines.

True b. wrong

99. For the signal flow of the OSN8800 equipment OTM site, the service sending direction: SDH signals LSX M40V OBU1 Line

True

False

100. Which of the following is not an advantage of using QinQ technology?

Solve the increasingly scarce public network VLAN ID resource problem

Provide a relatively simple Layer 2 VPN solution

Different services can be distinguished according to different levels of VLAN ID

Solve the problem of packet transmission delay

Page 11 of 15

101. Which of the following levels does the U2000 network management belong to?

Network level management system

Subnet level management system

Network element level management system

Management systems at the regional level

102. Tunnel/ VC are two kinds of labels in MPLS, which of the following is the value range?

True

False

103. Which of the following IP addresses is a Class C IP address?

C2.A8.D2.e1

10.110.192.111

10011010.01101110.10000000.01101111

127.0.0.1

104. The encapsulation formats of TMD E1 service PWE3 mainly include SAToP mode and CESoPSN mode, the main difference is whether to perceive the structure of TDM signal and processing overhead.

True

False

105. There are three types of multi-level connection monitoring modes (TCM) of OTN, which ones are correct? (Multiple choice)

Cascade mode

Overlap mode

Nested patterns

Through mode

106. The difference between a wide area network and a local area network, which of the following is correct?

The WAN is mainly accessed through a low-speed serial interface

Wide area network provides high-speed multiple access services

WANs typically exist within a small geographic area

WAN uses tokens to control network traffic

107. The SCC board can generate an optical supervisory channel.

True

False

108. Which of following are the traditional methods of multiplexing low-speed signals into high-speed signals? (Multiple choice)

Scrambling

Bit stuffing

Fixed location mapping

Byte stuffing

109. When setting the monitoring time of network element performance events, which of the following should the time be set to?

slightly later than the current time

Keep consistent with the current time of the network element

Earlier than the current time

Arbitrary settings

110. GFP-F (Frame-Mapped GFP) is a block-oriented data encoding (such as Fiber Channel, ESCON) processing mode.

True

False

Page 12 of 15

111. Both PDH and SDH have global unified standards .

True

False

112. The information payload area stores only the information payload.

True

False

113. Which of the following protocols does not belong to the MPLS signaling protocol?

RSVP

LDP

LMP

MP-BGP

114. Which of the following overheads does not belong to the ODUk overhead?

TCM

NJO

APS/PCC

115. MS-AIS and MS-RDI belong to a group of alarm information, and the generation of the alarm is related to K1 and K2 bytes .

True

False

116. Establishing a fixed connection of data forwarding between a designated external physical port, a V CRTUN K port and a designated LP port of a designated VB is called hooking.

True

False

117. Adjacent concatenation can be converted into virtual concatenation, but virtual concatenation cannot be converted into adjacent concatenation .

True

False

118. Which of the following adjustments carries the most information payload in the information payload area?

Positive adjustment

Negative adjustment

No adjustment

NDF inversion

119. Four network elements form an STM-4 bidirectional multiplex section protection ring. Which of the following is the maximum service capacity on the network?

1008 2M

504 2M

252 2M

63 2M

120. The switch receives a data frame, searches the MAC forwarding table according to the destination MAC address of the data frame, and the search result is one or a group of ports, and sends the data packet to the sending queue of the corresponding port according to the search result .

True

False

Page 13 of 15

121. Light propagates at different speeds in different media, and it seems that different media impede the propagation of light with different resistances .

True

False

122. Which of the following technologies is the IEEE 802.3 standard for?

Ethernet

Token Bus Network

Token Ring

FDDI network

123. The thickness, material and refractive index of the cladding material of the fiber core play a decisive role in the characteristics of the fiber.

True

False

124. A dynamic PW refers to a PW established through a signaling protocol . Currently, the PW signaling protocol is mainly RSVP-TE.

True

False

125. OTUk_UAS is the unavailable second of the optical transmission segment. The unavailable second refers to the severe errored second lasting for more than 10 seconds, and the unavailable time starts from the 11th second, but the 10 seconds of the severely errored second are also counted. Enter the unavailable time, when the severe errored second continues to disappear for more than 10 seconds, it will enter the available time from the 11th second, and the 10 seconds without serious errored seconds are also counted as available time.

True

False

126. Both OTUk and ODUkP support obtaining LOF and LOM information by detecting FAS and MFRS overhead .

True

False

127. Which of the following is the number of VLANs that QINQ technology can provide?

4095*4095

4096*1024

4096

1024*1024

128. When setting the VLAN tag value, all ports of the same device should be configured with the same VLAN ID.

True

False

129. Regarding the slot setting of the OSN 6800 subrack, which of the following descriptions is wrong?

The IU19 and IU20 slots are fixed for inserting and placing the power access board PIU, and each PIU can independently support subrack power supply

Slots IU9 and IU10 can be used for cross-connect board XCS, and each XCS can independently support service crossing between all slots

If the IU17 slot is not configured with SCC, the OTU single board can be inserted to provide the service cross function

IU17 and IU18 slots can be used for the main control board S CC, and each SCC can independently support subrack management

130. The first to third layers of the OSI reference model are called the bottom layer, also called the medium layer. The bottom layer is responsible for the transmission of data in the network. Located on the upper three floors, it is realized by combining hardware and software.

True

False

Page 14 of 15

131. The 2Mbit/s signal is currently used the most. Which of the following steps are involved in the process of multiplexing the 2Mbit/s signal into the STM-N? (Multiple choice)

Rate adaptation

Join Pointer

Add segment overhead

Scrambling

132. Which of the following is the OPUk payload structure identification overhead?

RES

PSI

PJO

NJO

133. Which of the following situations occurs, the ODUk_PM_DEG alarm will be reported on the network management?

ODU layer PM segment bit error limit, when the number of bit errors exceeds the specified bit error excess threshold

ODU layer PM segment error degradation, when the number of error codes exceeds the specified error degradation threshold

ODUk TCMn layer signal degradation, when the number of bit errors exceeds the specified error threshold

ODUk TCMn layer error limit exceeds the limit, when the number of error codes exceeds the specified error degradation threshold

134. AU-PTR is an indicator used to indicate the position of the information payload in the STM-N frame, so that the receiving end can correctly separate the information payload according to the value of the position indicator (pointer value), so as long as the pointer indicates the information payload The load area can make the receiving end correctly separate the service signal.

True

False

135. Which of the following is the adjustment unit of AU-PTR?

A byte

Two bytes

Three bytes

Four bytes

136. Which of the following descriptions of the electrical layer multiplexing and mapping steps of ODU0 is wrong?

2 ODU0 signals are mapped and multiplexed, and finally can be multiplexed into 1 OTU1 [V] signal

8 ODU0 signals are mapped and multiplexed, and finally can be multiplexed into 1 OTU2 [V] signal

After mapping and multiplexing, 34 ODU0 signals can be multiplexed into 1 OTU3 [V] signal

After mapping and multiplexing, 80 ODU0 signals can be multiplexed into 1 OTU4 [V] signal

137. Which of the following optical fiber losses mainly include? (Multiple choice)

Absorption loss

Bending loss

Reflection Loss

Scattering loss

138. The R-LOS alarm has nothing to do with the overhead byte but with the input signal quality.

True

False

139. The SDH optical interface only scrambles electrical signals.

True

False

140. Which of the following is the object protected by the channel protection ring?

Optical fiber

Business

equipment

Monitoring channel

Page 15 of 15

141. ATM nr.m is composed of up to n optical channel multiplexing, r means reduced function (reduced), and does not support non-associated overhead.

True

False

142. If the OTUk layer overhead is damaged, the board may report OTUk_SM_AIS to indicate the abnormal situation.

True

False

143. The receiving end performs BIP- 8 check on the received STM-16 frame before descrambling, and the result obtained is different from the B1 byte of the next STM-16 frame received or the result is 100 01100, then this means There are several error blocks in the STM -16 frame, which of the following options is correct?

HCIA-Transmission V2.5 H31-311_V2.5 Exam Dumps

HCIA-Transmission V2.5 H31-311_V2.5 Exam Dumps

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