The transmission plane mainly completes the functions of optical signal transmission, multiplexing, configuration protection switching, and switching connection. And ensure the reliability of the transmitted optical signal. But the exchange action of this layer is carried out under the action of the management plane and the control plane.
- A . TRUE
- B . FALSE
When a signal with a standard Ethernet frame length of 64 Bytes is connected to the Ethernet board, if the QinQ function is enabled, what is the actual frame length of the signal inside the board?
- A . 64
- B . 84
- C . 68
- D . 80
The length range of the DATA field in the Ethernet frame structure is?
- A . 46-1500 bytes
- B . 46-1518 bytes
- C . Section 64-1518
- D . 64-1500 bytes
When the main control board is configured with a single board, which step is required to replace the single board than when the main control board is configured with a dual configuration?
- A . Download the original configuration data
- B . Ensure that the host software version is the same before and after the replacement. If it is inconsistent, please upgrade and replace the single board software first.
- C . Check the consistency of network management and network element data.
- D . Query the board alarm and confirm that the original alarm has been cleared.
Which of the following statements about the MPLS-TP OAM level is correct?
- A . Section is the service layer of Tunnel, Tunnel is the service layer of PW, and PW is the service layer of Service
- B . Section is the service layer of PW, PW is the service layer of Tunnel, and Tunnel is the service layer of Service
- C . Service is the service layer of PW, PW is the service layer of Tunnel, and Tunnel is the service layer of Section
- D . Tunnel is the service layer of PW, PW is the service layer of Service, and Service is the service layer of Section
The following description of the internal port attributes of the Ethernet board, which is wrong?
- A . Ingress port to Access property. If the input data has a VLAN ID, discard it
- B . For the ingress port of Tag Aware attribute, if the input data has a VLAN ID, the received data will be transparently transmitted
- C . For the ingress port of the Access attribute, if the input data does not have a VLAN ID, it will be directly transmitted transparently
- D . For the ingress port of the Tag Aware attribute, if the input data does not have a VLAN ID, discard it
MPLS APS is a network protection mechanism, which realizes service switching through the detection function of MPLS OAM.
- A . TRUE
- B . FALSE
Which of the following SOM systems cannot be monitored?
- A . Main optical path performance
- B . Type of originating FEC
- C . Flatness of light performance
- D . Input optical power of the receiving end OTU
For emergency treatment of business interruption, fault location should be carried out as soon as possible, and then the business should be restored.
- A . TRUE
- B . FALSE
The setting of alarm reversal is based on?
- A . Single board
- B . Network element
- C . Port
- D . Alarm
You need to perform () operation before querying the error code and optical power on the network management system, otherwise the corresponding teaching data cannot be queried.
- A . Create logical fiber
- B . Configuration data
- C . Synchronize network element data
- D . Enable network element performance monitoring time
For ODUk SNCP protection, if the pass-through site is an electrical relay station, it is recommended to configure the SNCP type as SNC/I when configuring the protection.
- A . TRUE
- B . FALSE
When performing a 10-minute error-free test on a certain wavelength division channel, the local end uses an SDH analyzer to interconnect with the client-side interface of the OTU board, the OTU client interface at the opposite end needs to perform fiber self-looping, and solid attenuation must be added during self-looping.
- A . TRUE
- B . FALSE
In the characteristic test of the splitter (combiner), what standard is required for the isolation test?
- A . <20dB
- B . <25dB
- C . >20dB
- D . >25dB
Since the CWDM system does not use optical amplifiers, the focus of commissioning is whether the light reception of the OTU board is reasonable.
- A . TRUE
- B . FALSE
The maximum output optical power of an optical amplifier OBU is 20 dBm, and when it is used in the C-band 80 passive system, how much dBm should the single-wave standard output optical power be?
- A . +4dBm
- B . +7dBm
- C . -2dBm
- D . +1dBm
When the input optical power of the OAU amplifier at the receiving end is lower than the nominal optical power, the following operations which is wrong?
- A . Adjust the adjustable optical attenuation before the receiving amplifier to increase the input optical power of the amplifier
- B . Set OAU gain so that its output reaches the nominal value
- C . Increase the transmit optical power of the transmitter
- D . When the input optical power cannot be increased by adjusting the adjustable attenuator, the adjustable attenuation at the input of the de-suppression amplifier
When using the path method to create a client path, if there is an RLOS alarm on the line board, the path cannot be created.
- A . TRUE
- B . FALSE
When using the path method to create OCh, which of the following service layer paths is necessary?
- A . ODUk
- B . OMS
- C . OTS
- D . Client
By default, the network element automatically backs up the network element database to the FLASH library every 30 minutes.
- A . TRUE
- B . FALSE
The following description about using the synchronization method to create optical fibers, which is wrong?
- A . There is no need to create an optical fiber with the same information on both the network management side and the network element side.
- B . If there are optical fibers that have not been created on the network management system or optical fibers that have not been created on the network element, they need to be synchronized or created.
- C . The existence of conflicting fibers does not affect the configuration of the path, so you can ignore it
- D . Conflicting fiber refers to the fiber that has been configured on the network element side that is inconsistent with that on the network management side.
The following description of Flexible ROADM, which is wrong?
- A . Improve spectrum utilization to meet the flexible scheduling requirements of the future era of over 100Gbit/= rate.
- B . DFlexible ROADM is compatible with existing networks
- C . WSMD2 board supports F1exible ROADM configuration
- D . Flexible grid technology can flexibly set the bandwidth and support the flexible allocation and scheduling of bandwidth.
When creating a single-station optical crossover, an error message appears "The direction of the fiber and cable is incorrectly selected". Which are the possible reasons?
- A . The network management time of the network element is not synchronized
- B . "Create reverse crossover" is not selected during configuration
- C . The physical fiber connection error of the device
- D . Lack of logical fiber between boards
FOADM includes parallel FOADM and serial FOADM, both of which support full-wave 40 or 80-wave up and down at any wavelength.
- A . TRUE
- B . FALSE
Which of the following are the logical ports on the client side of the board in the standard mode?
- A . n(Nn/OUTn)-OCH: 1-ODUk: m-ODUp: a
- B . ClientLP-n
- C . RX/TX-n
- D . ODUkLP-n
In the WDM network design, as long as enough EDFA cascades are used to compensate for the optical power loss in the transmission process. Then the system can transmit a long distance without restriction.
- A . TRUE
- B . FALSE
Generally in NG WD systems, the full-wave incoming fiber optical power generally does not exceed 20dBm. Which is the main reason?
- A . In order to prolong the service life of the laser of the veneer
- B . In order to protect the optical cable
- C . To avoid non-linear effects
- D . In order to maintain the personal safety of personnel
The compensation of the chromatic dispersion of the WDM system mainly adopts the DCM compensation method. The following statement about DCM dispersion compensation, which is wrong?
- A . Improper DCM configuration will lead to degradation of system signal-to-noise ratio.
- B . For 10G systems with line fiber length within 400km, G.652 DCI can be used to compensate G.655LEAF.
- C . DCM module is more likely to cause nonlinearity than line transmission fiber, so it is necessary to strictly control the optical power of the fiber.
- D . Improper DCM configuration will cause degradation of receiver performance.
Which of the following functions does EX40 add to X40?
- A . More combined and split waves
- B . Support optical layer crossover
- C . occupies fewer slots
- D . Support single-channel optical power monitoring
Which of the following subracks does not support the configuration of grouped boards?
- A . OSN 1800II
- B . OSN 9800 P18
- C . OSN 8800 T16
- D . OSN 1800V
Which of the following unified line boards can support the crossover of VC, packet and ODUk at the same time?
- A . U210
- B . HUNQ2
- C . UNQ2
- D . HSNS4
The optical and electronic racks of the OSN 9800 equipment communicate through the master-slave sub-rack cascade connection, and are connected through the GE1/2 port on the CTu board.
- A . TRUE
- B . FALSE
Which of the following is not a function of RSVP-TE?
- A . LSP path optimization
- B . LSP deletion
- C . LSP rerouting
- D . Establish neighbor relations
The functions of MG-SDH can be expanded through software upgrades.
- A . TRUE
- B . FALSE
When the cross-connect board is configured with 1+1 hot backup, the replacement of the cross-connect clock board will not affect the packet service under normal switching conditions.
- A . TRUE
- B . FALSE
Which of the following is not 400G originating modulation technology?
- A . Advanced oDSP algorithm
- B . Multi-carrier generation and multiplexing
- C . High-order modulation (xQAM)
- D . FDDM/Nyquist spectrum compression technology
When configuring Ethernet Layer 2 attributes, when the "TAG" is set to "Accese" or "Hybrid", you need to set the "default VLAN ID" and "VLAN priority" of the untagged frame. "VLAN priority" should be set according to the unified planned QoS.
- A . TRUE
- B . FALSE
In the same subnet, when configuring NNI port properties, the IP of the ports at both ends of different links can be repeated.
- A . TRUE
- B . FALSE
VPLS (Virtual Private LAN Service) is a two-layer VPN technology that simulates a local area network.
- A . TRUE
- B . FALSE
If the Tunnel to which the PW belongs is configured with Tunnel APS, the PW cannot be configured with PW APS.
- A . TRUE
- B . FALSE
MPLS-TP is a subset of MIPLS, which removes connectionless IP-based forwarding and adds end-to-end OA functions.
- A . TRUE
- B . FALSE
The following description of the performance parameters of line fiber quality monitoring, which is wrong?
- A . Increasing the pulse width will increase the duration of laser emission, that is, increasing the injected energy, and a larger dynamic range can be obtained, but an increase in pulse width will result in a larger blind zone.
- B . The total optical fiber loss will affect the actual detection distance. The dynamic range of the same detection mode is fixed. The greater the total optical fiber loss, the smaller the detectable distance.
- C . The width of the light pulse emitted by the detection in different modes is different, and the pulse width affects the separation accuracy and the monitoring distance. The larger the pulse width, the larger the dynamic range, the longer the test distance, and the higher the ranging accuracy.
- D . The line fiber quality monitoring function adds up the results of multiple measurements and averages them to improve the monitoring accuracy. The actual time from the start of the detection to the return of the detection results by the software will be longer than the set "detection time".
The collection and storage of on-site data include regular collection during normal operation of the equipment and collection when the equipment is out of order. Generally, maintenance personnel must collect and save on-site data before troubleshooting.
- A . TRUE
- B . FALSE
In the electrical layer overhead processing-sink function, the signal flow from OCh to Client direction, first detect PM ODUkP, and then detect TCM ODUkT.
- A . TRUE
- B . FALSE
Which of the following descriptions of PM_BIP8 related alarms is correct?
- A . The PM_BIP8_DEG alarm indicates a signal degradation alarm in the PM segment of the ODU layer.
- B . The PM_BIP8_SD alarm indicates the signal degradation alarm of the PM segment at the OTU layer.
- C . The PM_BIP8_OVER alarm indicates the ODU layer PM error amount over-limit alarm.
For the relay OTU, all SM segment alarms are terminated at the local station and no longer sent downstream (except for OTUkLOF to insert ODUk_PI_AIS downstream). Other alarms continue to be transmitted to the downstream station and reported on the WDM side of the OTU (except for R_LOS to insert ODUK_PM_AIS to the downstream station)
- A . TRUE
- B . FALSE
In the process of maintaining OSN equipment, I often see fans running at full speed, and the equipment reports TEMP_OVER alarms. The common causes and handling methods are?
- A . The dust filter is very dusty, which affects the ventilation, and the dust filter needs to be removed for cleaning
- B . The dust inside the fan is serious, which affects the speed, and the fan needs to be removed to clean it.
- C . The power module of the single board has serious dust accumulation, which affects heat dissipation and needs to be removed by pulling out the board
- D . The cooling function of the optical module is abnormal, and the optical board needs to be replaced
When performing fiber synchronization, the network element does not create a fiber representation?
- A . Optical fiber connection only exists on the network element side
- B . Optical fiber connection that does not exist on the network management side and the network element side
- C . Optical fiber connections exist on both the network management side and the network element side
- D . The fiber connection only exists on the local network management side
When configuring 1+1 optical line protection, you can select RI1/TI2/TO2 as the working channel according to the actual situation.
- A . TRUE
- B . FALSE
The following description about ODUk ring network protection, which is wrong?
- A . ODUk ring network protection is mainly used in ring networking with distributed services. By occupying two different ODUk channels, it can protect multiple distributed services between all sites.
- B . The protection configuration of each site on the ring network must be completed before starting the agreement.
- C . Enhanced ODUk ring network protection, no need to set up management nodes. If the management node is set, it will not affect the protection
- D . Ordinary ODUk ring network protection does not require a management node.
The following description about 1+1 optical line protection, which is wrong?
- A . The default switching mode is non-recovery
- B . The default switching mode is double-ended switching
- C . The initial difference between the main and standby input light defaults to 0
- D . The main and standby input optical difference gate defaults to 5dB
For the non-linear effect FWM, which of the following processing methods is correct?
- A . Control the incoming fiber optical power
- B . Control the optical power of a single wavelength
- C . Do not use G.653 fiber in DWDM system
- D . Use optical fiber with large effective area
The following description about single-site commissioning, which is wrong?
- A . If the input voltage of the device is not within the required range, rectification suggestions should be made and power-on is strictly prohibited
- B . It is strictly forbidden to plug and unplug the power plug and PIU board when power is on
- C . In the case of power failure, you can touch the veneer without wearing anti-static wrist or anti-static gloves
- D . After checking the single station hardware, make sure that all power switches are in the off position
Since the EALC/ALC function is used in the SOM system, it may cause business interruption when adjusting the optical power.
- A . TRUE
- B . FALSE
After the PWE3 service is successfully deployed, the "Deployment Status" of the PWE3 service is displayed as?
- A . Deployment
- B . Activated
- C . Deployed
- D . Activation
Among the following versions of GSCC boards, which support CF cards?
- A . N1GSCC
- B . N4GSCC
- C . N6GSCC
- D . N3GSCC
In the Colored&Directioned scenario of 4D ROADM, how many sets of M40V+D40 are needed to realize local service scheduling to four directions?
- A . 2
- B . 1
- C . 4
- D . 9
After starting the extended SSM protocol, in addition to judging the clock quality level and priority, it also judges the clock ID. After the network element receives the clock signal with ID, if it is judged that the clock signal is sent by the local station, the source is considered unavailable. In this way, even after passing through multiple sites, the network element can still recognize the clock signal sent by itself, preventing the formation of a timing loop.
- A . TRUE
- B . FALSE
The following description of each content in the calculation formula of the maximum line rate frame rate (N=Ratc/((L+7+1+M) x8)), which is wrong?
- A . L is based on the standard Ethernet frame length, the minimum is 64Bytes
- B . M is the frame gap, the minimum IFG (minimum frame gap) is 8Bytes
- C . Rate represents the line rate of the physical layer. If the device port is FE, then Rate=100Mbit/s
- D . The "8" outside the brackets means 1 Byte contains 8 Bits
NG WDM two-dimensional ROADM sites can use WSMD9 single board, and its signal flow is the optical signal connected to the main optical channel from the "IN" optical port. 9 channels of the same optical signal are broadcast through the RDU (ROADM Demix Unit) optical module and output from the "DM1~DM8" and "ECPO" optical ports. One of the signals is locally dropped by the demultiplexer board, and the other 8 signals are dispatched to the other 8 directions. Access the signals of the main optical channel from the "EXPI" optical port. The multiplexed or single-wave optical signals that need to be inserted locally are input through the "AM1" ~ "AM8" optical ports.
- A . TRUE
- B . FALSE
Which of the following does not belong to the ASON control protocol?
- A . LMP
- B . RSVP-TE
- C . IS-IS
- D . OSPF-TE
The ROADM site can support up to 9 dimensions using the WSMD9 single board. If there are more than 9 dimensions, it can be realized by cascading the WSMD9 single board.
- A . TRUE
- B . FALSE
NG WDM equipment is the same as STP equipment, you can practice network element configuration on the network management through the pre-configuration method.
- A . TRUE
- B . FALSE
Before creating an optical crossover, you need to manually configure the corresponding port of the corresponding board as a boundary port, such as the line-side port of the FIU board between two sites.
- A . TRUE
- B . FALSE
Before the ROADM single board performs optical power commissioning, the virtual optical layer service must be configured first, otherwise the ROADM limited single board will block all wavelengths by default.
- A . TRUE
- B . FALSE
The OTS path refers to the physical optical fiber connection between two adjacent OM/OD/OA on the main optical path.
- A . TRUE
- B . FALSE
The following description about the signal flow of the OTM site (OSN 8800 equipment), which is wrong?
- A . Service sending direction: SDH signals-> LSX-> M40V-> OBU1-> Line
- B . OSC receiving direction: Line-> FIU-> Sc2
- C . Service receiving direction: Line->FIU-> OAU-> M40V-> LSX-> SDH signals
- D . Service sending direction: SDH signals-> LSX->M40V-> OBU1-> FIU-> Line
NS4 is a 100G line service processing board. In the following description of the NS4 board, which is wrong?
- A . The wavelength of the optical signal on the wavelength division side is adjustable within the 80-wave range of the C-band 50GHz interval.
- B . The MS4 board does not support the ODUI service crossover with the ND2 board through the centralized crossover bus
- C . Support 80 channels of ODU0/ODUflex or 40 channels of ODU1 or 10 channels of ODU2/ODU2e or 2 channels of ODU3 or 1 channel of ODU4 signals and cross-board to realize the cross dispatch of services.
- D . It can be used in electrical relay station to realize the electrical relay function of corresponding optical signal.
The following description of the NG WDM equipment connected to the network management computer, which is wrong?
- A . Connect to the network management computer can be connected directly or through a local area network, depending on the situation
- B . If the subrack connection mode is master-slave mode, the network management computer must be connected to the main subrack.
- C . The IP addresses of all network elements must be in the same address range as the IP address of the network management computer.
- D . Only the gateway network element needs to be connected to the network management computer.
The lower the noise figure of the amplifier is, the less noise the amplifier introduces.
- A . TRUE
- B . FALSE
For a 10G OTU board, the receiving end optical module uses PIN module, then which of the following receiving power is within the normal receiving range of the board?
- A . -9dBm
- B . -19dBm
- C . 9dBm
- D . 19dBm
The OSN 8800 equipment adopts fan redundancy protection. When any fan in the fan box fails, the system can still operate normally for a long time.
- A . TRUE
- B . FALSE
Which of the following IP addresses are not private IP addresses?
- A . 172.128.0.1
- B . 10.255. 0.1
- C . 10.0.0.1
- D . 192.168.0.1
What are the user-oriented interface and the transmission network-oriented interface of E-Line service?
- A . UNI, UNI
- B . UNI, NNI
- C . NNI, UNI
- D . NNI, NNI
Overhead ratio is a factor that affects the error correction capability of FEC technology. Generally, under the same FEC encoding/decoding algorithm conditions, the higher the overhead ratio, the greater the net coding gain.
- A . TRUE
- B . FALSE
What are the main functions of the transport layer in the Huawei ECC protocol stack?
- A . Establish and maintain MAC connections between adjacent network elements.
- B . Establish and maintain the ECC routing table.
- C . Provide end-to-end communication services to the upper layer
- D . Provide data communication services.
Which of the working modes provided by the line fiber quality monitoring function is not included?
- A . Intra-office mode
- B . Near-end mode
- C . Automatic mode
- D . Manual mode
A.C is the wavelength division OTM site, and B is the relay site. When the optical fiber in the sending direction from station A to station B is interrupted, the WDM side of the OTU relay board of station B will report the R_LOS emergency alarm and perform processing, and then send it to upstream A. OTU2_BDI minor alarm at the sub-side of the station. At the same time, the alarm continues to be transmitted to the downstream station of station B. After the alarm is processed at station C, the WDM side of the OTU board at station C will report the ODU2_PM_AIS minor alarm, and return the ODU2_PM_BDI minor alarm to the upstream station A.
- A . TRUE
- B . FALSE
Which layer of the TCP/UDP protocol is located in the TCP/IP protocol?
- A . Application layer
- B . Network layer
- C . Data link layer
- D . Transport layer
Which of the following paths has nothing to do with business?
- A . OCh
- B . OSC
- C . Client
- D . ODUk
In a wavelength division system, after a certain distance of transmission, the optical signal-to-noise ratio of the receiving end signal will be reduced to a certain extent. The main reason is ？
- A . The fiber attenuation is too large
- B . Use of demultiplexer
- C . Use of EDFA
- D . No new optical fiber is used
When the value of S1 byte is 0x02, it means ？
- A . G812 transfer office clock signal
- B . G812 local data clock signal
- C . Synchronization quality is agnostic
- D . G811 clock signal
Which of the following descriptions about pointer adjustment is correct ？
- A . When the rate of VC4 (frame rate) is higher than that of AU-4 (frame rate), it will be adjusted
- B . If the station detects that there is a low-level channel with a TU pointer adjustment event, it means that the station has a pointer adjustment
- C . AU and TU pointer adjustments are adjusted in units of 1 byte
- D . When the receiving end receives NDF inversion for 8 consecutive frames, the device generates an AU_LOP alarm (AU pointer is lost)
Regarding the description of replacing the main control board, which is wrong?
- A . The BD_STATUS and COMMUN_FAIL alarms will be reported when the main control board is removed and inserted. After the new board goes online, these alarms need to be cleared manually.
- B . If the software version carried on the replaced main control board is higher than the device version, you need to clear the main control library first, and then downgrade the main board software to the same version as the device.
- C . If the software version locked on the replaced main control board is lower than the device version, you need to upgrade the software on the main control board to the same version as the device
- D . When the main control board has 1+1 hot backup, under normal switching conditions, the replacement of the main control board will not affect the business.
The following statement about the alarm reversal function, which is wrong?
- A . For ports that have not opened services, alarm reversal is used to avoid related alarms
- B . By default, it is non-reverse mode. In this mode, the alarm of the device port cannot be reversed.
- C . In automatic recovery mode, regardless of whether the port currently has an alarm or not, the port device alarm can be reversed
- D . After the port device alarm is reversed, no alarm is reported when there is an actual alarm, and an alarm is reported when there is no actual alarm.
The key to NG WDM system fault location is to accurately locate the fault to a single station.
- A . TRUE
- B . FALSE
"Loopback method" includes the following four steps: 1. Loopback business channel sampling; 2. Draw a business path diagram; 3. Loopback section by section to locate the faulty site; 4. Preliminarily set as a single board problem. The correct order of the above four steps is?
- A . 1234
- B . 3124
- C . 2143
- D . 2134
The following description about the composition of the SOM system, which is wrong?
- A . The intelligent management software SOM is integrated on the U2000.
- B . The SOM system is composed of a hardware part and a software part.
- C . Spectral analysis type single board, optical amplification single board, used to obtain optical performance data, and conduct ongoing monitoring of optical signals without interrupting business.
- D . The software part completes real-time monitoring and real-time reporting of the optical performance of the network, and performs related adjustment operations.
The optical fiber quality detection light of the TNF1AST4 board shares the light source with the OSC channel. When the TNF1AST4 board is used for detection in the "advanced parameter mode" (), the OSC communication will be interrupted. At this time, only the fiber quality detection signal is sent, and the detection dynamic range is large.
- A . Online mode
- B . Typical model
- C . Normal mode
- D . Offline mode
PWE3, as an end-to-end Layer 2 service bearing technology, provides a point-to-point L2VPN service in a public network, and transmits various services (such as Ethernet, TDM services) through a packet-switched network (PSN), also provides end-to-end virtual link simulation at the boundary of the PSN network.
- A . TRUE
- B . FALSE
The service signals that the HUNQ2 board cannot transmit are:
- A . STM-16
- B . GE
- C . ODU3
- D . ODUflex
In the extended SSM ring network dual BITS clock protection scenario, in order to prevent the clock signal from forming a loop, you only need to configure the external clock source and internal clock source ID of the network element connected to the active BITS, and the network element connected to the standby BITS does not need to configure the internal clock ID.
- A . TRUE
- B . FALSE
The network element addresses used by each layer in the HWECC protocol stack are all network element IDs. The length of the network element ID is () bit, the highest () bit is called the subnet number (or extended ID), and the low () bit is called the basic ID.
- A . 24, 8, 16
- B . 32, 8, 24
- C . 24, 12, 12
- D . 32, 16, 16
It mainly completes the point-to-point voice communication between neighboring stations, without dialing, just off-hook. This PCM service is called:
- A . Sub-rate services
- B . Z interface extension business
- C . FXS hotline business
- D . E&M relay service
The size of the crossover capacity of the NG SDH system is determined by the crossover single board, so the crossover capacity upgrade is completed by replacing the crossover board.
- A . TRUE
- B . FALSE
In OSN 1800, the LOA single board can implement the Ethernet Layer 2 scheduling function.
- A . TRUE
- B . FALSE
G.652 DCM-C parameter C indicates how much KM of dispersion produced by G.652 can be compensated?
- A . Can compensate 60KM
- B . Can compensate 40KM
- C . Can compensate 80KM
- D . Can compensate 20KM
How much dBm is 100mw approximately equal to?
- A . 10dBm
- B . 15dBm
- C . 20dBm
- D . 13dBm
When testing the overload point and sensitivity of the IN port of an OTU board, which of the following is not needed?
- A . Optical power meter
- B . Attenuator
- C . SDH analyzer
- D . OTDR measuring instrument