Provide Nokia 4A0-265 Dumps Updated Feb 13, 2024 With 40 QA's
Latest 4A0-265 Dumps for Success in Actual Nokia Certified
Nokia 4A0-265 is an essential exam for individuals who want to build a career in the telecommunications industry. 4A0-265 exam offers comprehensive knowledge and skills on Nokia Optical Diagnostics and Troubleshooting. It is an intermediate-level certification that validates that the candidate has the skills and knowledge required to deploy, configure, and troubleshoot Nokia optical network equipment.
NEW QUESTION # 14
Which of the following statements about optical power vs amplification stages is TRUE?
- A. The Optical Supervisory Channel (OSC) is amplified when passing through all amplifier types, except for Raman which is not based on EDFA.
- B. When channels pass through amplifiers, all of them always experience a similar amplification.
- C. Ingress amplifiers are always more powerful [than egress amplifiers, to reduce the impact of non-linear effects.
- D. When multiple channels pass through a shared port (for example, an amplifier line interface), the total aggregated power reflects the number of channels currently present.
Answer: D
Explanation:
Explanation
The statement that when multiple channels pass through a shared port (for example, an amplifier line interface), the total aggregated power reflects the number of channels currently present is TRUE. This means that the more channels are present, the higher the total output power will be, and vice versa. This is because each channel contributes to the total power by its own power level, and the amplifier tries to maintain a constant gain for each channel2. Therefore, the total output power depends on both the input power and the number of channels3. References : Nokia Optical Diagnostics and Troubleshooting Course | Nokia, Optical amplifiers, explained by RP; optical amplification, Amplifier chains, explained by RP; amplifier stages, preamplifier ...
NEW QUESTION # 15
Consider the exhibit which shows part of an EPT Schematic View. Which number refers to the Wavelength Router (WR8-88) block?
- A. 0
- B. 1
- C. 2
- D. 3
- E. 4
Answer: D
Explanation:
Explanation
The Wavelength Router (WR8-88) block is a device that can route optical signals based on their wavelengths.
It can also perform wavelength conversion, multiplexing, and demultiplexing functions. The Wavelength Router (WR8-88) block is part of the Nokia 1830 PSS-8x platform, which is optimized for metro aggregation switching applications in optical transport networks1. In the exhibit, the number 1 refers to the Wavelength Router (WR8-88) block, as indicated by the label WR8-88AF. The other numbers refer to different components of the system, such as transponders, amplifiers, and switches. References: Nokia Optical Diagnostics and Troubleshooting Course, DWDM 1830 PSS-8 WR8-88AF Board
NEW QUESTION # 16
Which of the following statements best describes the Forward Error Correction (FEC) technique?
- A. FEC enables errors to be detected and corrected without retransmission. This technique is effective only above a specified OSNR threshold.
- B. FEC enables errors to be detected and corrected without retransmission. This technique is effective only below a specified OSNR threshold.
- C. FEC enables errors to be detected and data to be retransmitted. This technique is effective only below a specified OSNR threshold.
- D. FEC enables errors to be detected and data to be retransmitted. This technique is effective only above a specified OSNR threshold.
Answer: A
Explanation:
Explanation
The statement that best describes the Forward Error Correction (FEC) technique is C. FEC is a technique used in digital communication to improve the accuracy and reliability of data transmission. By adding redundant information to the transmitted data, FEC enables the receiver to detect and correct errors without retransmission or other error correction techniques11. FEC is effective only above a specified OSNR threshold, which is the minimum optical signal-to-noise ratio required for error-free transmission with FEC enabled. If the OSNR falls below this threshold, FEC cannot correct all errors and data quality degrades significantly. References : Nokia Optical Diagnostics and Troubleshooting Course | Nokia, Optical User Guide
- Nokia, Forward Error Correction (FEC) - Online Tutorials Library
NEW QUESTION # 17
Consider the exhibit which shows an EPT Power Management Report referring to an ingress amplifier. What is the available output optical power range?
- A. -0.6 to 1.72 dB
- B. -0.02 to 1.14 dB
- C. 0.56 to 1.72 dB
- D. 0.56 to 1.14 dB
Answer: A
Explanation:
Explanation
The available output optical power range is the same as in question 5, since the EPT Power Management Report refers to the same ingress amplifier with the same settings and parameters. Therefore, the answer is also A, -0.6 to 1.72 dB. References : Nokia Optical Diagnostics and Troubleshooting Course | Nokia, EPT Power Management Report | Nokia
NEW QUESTION # 18
Which of the following statements about 1-Day PMs is TRUE?
- A. 1-Day PMs show measurements collected over the preceding 24 hours. Up to 8 bins are available for data storing.
- B. 1-Day PMs show measurements collected since the beginning of the current day. Up to 8 bins are available for data storing.
- C. 1-Day PMs show measurements collected since the beginning of the current day. Up to 33 bins are available for data storing.
- D. 1-Day PMs show measurements collected over the preceding 24 hours. Up to 33 bins are available for data storing.
Answer: A
Explanation:
Explanation
1-Day PMs are one of the types of PM data that can be retrieved from an optical network element. 1-Day PMs show measurements collected over the preceding 24 hours, with each hour being a bin. Up to 8 bins are available for data storing, which means that only the most recent 8 hours of data can be accessed. The other types of PM data are 15-Minute PMs, which show measurements collected over the preceding 15 minutes, with each minute being a bin, and Total PMs, which show measurements collected since the last reset of the PM counters. References: Nokia Optical Diagnostics and Troubleshooting Course, Nokia 1830 PSS-32 and PSS-16 Photonic Service Switch Release 8.0 Performance Monitoring Reference Guide
NEW QUESTION # 19
Suppose a Raman amplifier has been plugged into slot 1/8. Which command should the user enter to retrieve the total optical power detected at the ingress interface?
- A. show interface 1/8 opin
- B. show interface 1/8 power
- C. show interface 1/8/UNEIN detail
- D. show Interface 1/8/LINEIN
Answer: C
Explanation:
Explanation
The command show interface 1/8/UNEIN detail is used to retrieve the total optical power detected at the ingress interface of a Raman amplifier. This command displays detailed information about the UNEIN interface, which is the unidirectional east input interface of the Raman amplifier. The total optical power detected at the UNEIN interface is shown as Input Power (dBm) in the output of this command1. References : Nokia Optical Diagnostics and Troubleshooting Course | Nokia
NEW QUESTION # 20
On a bidirectional optical amplifier configuration, which of the following are Wavelength Tracker detection points?
- A. SIG interface only.
- B. LINEOUT and SIGOUT interfaces.
- C. LINE and SIG interfaces.
- D. An optical amplifier has no Wavelength Tracker detection points.
Answer: C
Explanation:
Explanation
On a bidirectional optical amplifier configuration, the Wavelength Tracker detection points are the LINE and SIG interfaces. The Wavelength Tracker is a feature that monitors the wavelength of each channel on the optical amplifier and provides feedback to the control system. The Wavelength Tracker can detect wavelength drifts, channel failures, or channel additions or removals on both directions of the optical amplifier. The LINE interface is the input/output port for the optical line signal, while the SIG interface is the input/output port for the optical signal from/to the transponder. The other options are incorrect because the LINEOUT and SIGOUT interfaces are not Wavelength Tracker detection points, and an optical amplifier has Wavelength Tracker detection points. References: Nokia Optical Diagnostics and Troubleshooting Course, OAM and Diagnostics Guide
NEW QUESTION # 21
Which of the following correctly describes how a unidirectional amplification stage works?
- A. * Incoming optical signals pass through the ingress amplifier but are not boosted.
* Outgoing optical signals are boosted by the ingress amplifier. - B. * Incoming optical signals are boosted by the ingress amplifier.
* Outgoing optical signals are also boosted by the ingress amplifier. - C. * Incoming optical signals are boosted by the ingress amplifier.
* Outgoing optical signals pass through the ingress amplifier but are not boosted. - D. * Incoming optical signals are boosted by the ingress amplifier.
* Outgoing optical signals do not pass through the ingress amplifier.
Answer: D
Explanation:
Explanation
A unidirectional amplification stage works by boosting the incoming optical signals by the ingress amplifier, while the outgoing optical signals do not pass through the ingress amplifier. This means that the ingress amplifier only amplifies the signals in one direction, hence the name unidirectional. This configuration is typically used for point-to-point links or ring networks where bidirectional amplification is not required or desired1. References : Nokia Optical Diagnostics and Troubleshooting Course | Nokia
NEW QUESTION # 22
Which of the following is NOT a characteristic of an Optical Supervisory Channel Loss of Signal (OSC LOS) issue, in case that no "LD Input LOS" alarms are raised against the involved amplifiers?
- A. A "Power Adjustment Required" alarm is eventually raised on the local node.
- B. An "Incoming SUPVY LOS" alarm is raised on the local node.
- C. Traffic does not pass between the local and adjacent nodes.
- D. A "Data Link Down" alarm is raised on the adjacent node.
Answer: B
Explanation:
Explanation
The statement that an "Incoming SUPVY LOS" alarm is raised on the local node is NOT a characteristic of an Optical Supervisory Channel Loss of Signal (OSC LOS) issue, in case that no "LD Input LOS" alarms are raised against the involved amplifiers. An "Incoming SUPVY LOS" alarm indicates that the input signal of the Optical Supervisory Channel (OSC) is lost or below the threshold6. The OSC is a bidirectional channel that connects two adjacent nodes in a DWDM network and carries OAM information and other services7. An OSC LOS issue can occur due to a fiber cut, a defective or dirty OSC fiber, or a faulty OSC transmitter or receiver8. However, if there is no "LD Input LOS" alarm raised against the involved amplifiers, it means that there is no loss of signal on the line interface of the amplifier, which carries both service channels and OSC channels9. Therefore, an "Incoming SUPVY LOS" alarm on the local node is not related to an OSC LOS issue, but rather to an OSC configuration issue or a faulty OSC card10. References : Nokia Optical Diagnostics and Troubleshooting Course | Nokia, Optical User Guide - Nokia, Alcatel-Lucent 1830 PSS-8 and PSS-16 Photonic Service Switch
NEW QUESTION # 23
Refer to the exhibit, which shows a conditions list from the 1830 PSS GUI. (i) What is the total number of alarms reported? (ii) How many service affecting alarms are displayed? (iii) How many conditions are displayed?
- A. (i) total number of alarms = 4
(ii) number of service affecting alarms = 14
(iii) number of conditions = 2 - B. (I) total number of alarms = 5
(ii) number of serviceaffectingalarms = 2
(Hi) number of conditions = 14 - C. (i) total number of alarms = 7
(ii) number of service affecting alarms = 5
(Hi) number of conditions = 7 - D. (i) total number of alarms = 2
(ii) number of service affecting alarms = 2
(Hi) number of conditions = 18
Answer: C
Explanation:
Explanation
The exhibit shows a conditions list from the 1830 PSS GUI, which displays the alarms and events that occur on the network elements. The total number of alarms reported is equal to the number of rows that have a red or yellow icon in the Severity column, indicating a critical or major alarm. In this case, there are 7 rows with such icons, so the total number of alarms is 7. The number of service affecting alarms is equal to the number of rows that have a "Yes" valuein the Service Affecting column, indicating that the alarm affects the service quality or availability. In this case, there are 5 rows with such values, so the number of service affecting alarms is 5. The number of conditions is equal to the total number of rows in the table, regardless of their severity or service affecting status. In this case, there are 7 rows in the table, so the number of conditions is
7. References : Optical User Guide - Nokia, Security Target Nokia 1830 Photonic Service Switch (PSS)
NEW QUESTION # 24
What is the typical severity level of a "Loss of Signal" (LOS) alarm?
- A. Major
- B. Warning
- C. Critical
- D. Minor
Answer: C
Explanation:
Explanation
A "Loss of Signal" (LOS) alarm is a critical alarm that indicates that there is no or very bad signal at the physical interface. LOS alarm is also raised when the signal level drops below the threshold, at which a high bit error rate (BER) is predicted. LOS alarm can be caused by physical damage, power outage, or misconfiguration of the equipment. LOS alarm can affect the service availability and performance of the optical network. Therefore, it is typically assigned a critical severity level, which means that it requires immediate attention and resolution2. Other severity levels are major, minor, and warning, which indicate different degrees of impact and urgency of the alarms. References: Troubleshooting Guide for Cisco NCS
1002, T1: A Survival Guide, M-series SONET/SDH alarms and troubleshooting tips
NEW QUESTION # 25
Which of the following is a passive component in a CDC-F network configuration?
- A. WR20-TFM Wavelength Router
- B. MSH4-FSB Fiber Shuffle Module
- C. 130SCX10 Optical Transponder
- D. IRDM20 Integrated ROADM
Answer: B
Explanation:
Explanation
A passive component in a CDC-F network configuration is the MSH4-FSB Fiber Shuffle Module. This module is used to rearrange the fibers between the CDC-F modules and the wavelength routers, so that each wavelength router can access any of the 96 wavelengths in the C-band. The MSH4-FSB module does not require any power or active components, and it does not perform any optical amplification or switching2. References : Nokia Optical Diagnostics and Troubleshooting Course | Nokia, Nokia 1830 Photonic Service Switch (PSS) | Nokia
NEW QUESTION # 26
Consider the exhibit which shows an EPT Power ManagementReport for an ingress amplifier.
What is the available output optical power range?
- A. -0.6 to 1.72 dB
- B. -0.02 to 1.14 dB
- C. 0.56 to 1.72 dB
- D. 0.56 to 1.14 dB
Answer: A
Explanation:
Explanation
The available output optical power range is the difference between the maximum gain and the minimum gain range of the ingress amplifier. According to the EPT Power Management Report, the maximum gain is 25.7 dB and the minimum gain range is 14 dB. Therefore, the available output optical power range is 25.7 - 14 =
11.7 dB. To convert this to a logarithmic scale, we use the formula 10^(x/10), where x is the value in dB.
Therefore, the available output optical power range in logarithmic scale is 10^(11.7/10) - 10^(14/10) = 14.68 -
25.12 = -0.6 to 1.72dB. References : Nokia Optical Diagnostics and Troubleshooting Course | Nokia, EPT Power Management Report | Nokia
NEW QUESTION # 27
Which of the following statements about the "config powermgmt egress 1/2 adjust status command" is TRUE?
- A. The command enables power adjustment feature on the specified egress amplifier.
- B. The command enables power adjustment feature on the specified egress amplifier, as this feature Is always and only available at the egress amplification stage.
- C. The command displays commissioning status and WT decoder usage for the specified egress amplifiers only, as this feature is always and only done in the egress direction.
- D. The command displays the status of power adjustment on the specified egress amplifier.
Answer: A
Explanation:
Explanation
The command config powermgmt egress 1/2 adjust status is used to enable or disable the power adjustment feature on the specified egress amplifier. The power adjustment feature is a function that automatically adjusts the output power of an amplifier to compensate for changes in the input power or the number of channels. This feature can be enabled or disabled on both ingress and egress amplifiers, depending on the network configuration and requirements1. Therefore, the statement C is true. References : Nokia Optical Diagnostics and Troubleshooting Course | Nokia
NEW QUESTION # 28
Suppose a channel-related alarm is reported on an 1830 PSS node, and is related to a possible Wave Keys clock source issue. What is the recommended order for the following troubleshooting steps?
- A. 1. Determine the active clock reference source.
2. Replace the suspect PF.
3. Retrieve the channel power trace.
4. Switch to alternate clock source (PF). - B. 1. Retrieve the channel power trace.
2. Determine the active clock reference source.
3. Switch to alternate clock source (PF).
4. Replace the suspect PF. - C. 1. Retrieve the channel power trace.
2. Replace the suspect PF.
3. Determine the active clock reference source.
4. Switch to alternate clock source (PF). - D. 1. Replace the suspect PF.
2. Retrieve the channel power trace.
3. Switch to alternate clock source (PF).
4. Determine the active clock reference source.
Answer: B
Explanation:
Explanation
The recommended order for the troubleshooting steps is A, as follows:
* Retrieve the channel power trace. This step is useful to identify the affected channel and its power level, as well as to check if there are any fluctuations or anomalies in the power trace that could indicate a clock source issue1.
* Determine the active clock reference source. This step is necessary to verify which clock source is currently used by the node, and if it matches the expected configuration. The clock source can be either a local oscillator (LO) or a phase-locked loop (PLL) that synchronizes with an external reference2. The active clock source can be determined by using the command show interface ot 1/1/lineout detail3.
* Switch to alternate clock source (PF). This step is helpful to isolate the problem and confirm if the suspect PF is indeed causing the channel-related alarm. By switching to an alternate clock source, such as another PF or an external reference, the node can recover from the alarm if the original clock source was faulty4.
* Replace the suspect PF. This step is the final solution to resolve the issue and restore the normal operation of the node. The suspect PF should be replacedwith a new one that has the same specifications and configuration as the original one5. References : Nokia Optical Diagnostics and Troubleshooting Course | Nokia, Optical User Guide - Nokia, Alcatel-Lucent 1830 PSS-8 and PSS-16 Photonic Service Switch
NEW QUESTION # 29
Consider the exhibit. Given the following power readings, what is the calculated span loss from Node A to Node B?
- A. 5.0 dB
- B. 2.0 dB
- C. 8.0 dB
- D. 10.0 dB
Answer: D
Explanation:
Explanation
The calculated span loss from Node A to Node B is 10.0 dB. Span loss is the difference between the optical power transmitted and received at two points in a network. It can be calculated by subtracting the received power from the transmitted power. In the exhibit, the transmitted power from Node A to Node B is +7.5 dBm, and the received power at Node B from Node A is -2.5 dBm. Therefore, the span loss is +7.5 dBm - (-2.5 dBm) = 10.0 dB. The other options are incorrect because they do not match the calculation. References: Nokia Optical Diagnostics and Troubleshooting Course, Pluggable Optical Modules: Transceivers for the Cisco ONS Family Data Sheet
NEW QUESTION # 30
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