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NEW QUESTION # 12
Which of the following statements correctly describes where power adjustments can be performed?
- A. In bidirectional configurations, both ingress and egress power adjustments are performed against the ingress amplifiers only.
- B. In bidirectional configurations, ingress power adjustments are performed against the ingress amplifiers, while egress power adjustments are performed against the egress amplifiers.
- C. In unidirectional configurations, both ingress and egress power adjustments are performed against the ingress amplifiers only.
- D. When Raman pumps are used, both ingress and egress power adjustments are performed against the Raman pump directly.
Answer: B
Explanation:
Explanation
In bidirectional configurations, where the same fiber is used to transmit signals in both directions, power adjustments can be performed at both ingress and egress amplifiers. The ingress power adjustments are performed against the ingress amplifiers, which boost the incoming signals from the opposite direction. The egress power adjustments are performed against the egress amplifiers, which boost the outgoing signals from the same direction2. Therefore, the statement A is correct. References : Nokia Optical Diagnostics and Troubleshooting Course | Nokia, Optical amplifiers, explained by RP; optical amplification
NEW QUESTION # 13
A power adjustment has succeeded conditionally because of gain settings set to higher levels than expected by design. Which of the following alarms will raise?
- A. Gain Adjustment Exceeded Max Value (PWRMAXGAIN)
- B. Amplifier Gain Tilt Adjustments Suspended (PWRTILTSUSP)
- C. Invalid topology (PRCDRERR-TOPO)
- D. Power Adjustment Failure (PWRADJFAIL)
Answer: B
Explanation:
Explanation
A power adjustment has succeeded conditionally because of gain settings set to higher levels than expected by design. This means that the optical power levels of the amplifier have been adjusted within the acceptable range, but the gain values are higher than the design values. This can cause a performance degradation or instability of the optical signal. The alarm that will raise in this case is "Amplifier Gain Tilt Adjustments Suspended" (PWRTILTSUSP). This alarm indicates that the gain tilt adjustments, which are used to compensate for the wavelength-dependent loss of the optical signal, have been suspended due to high gain values. The alarm also suggests lowering the gain values manually or using the EPT tool. The other alarms are incorrect because they either indicate a different type of power adjustment issue or do not exist. References: Nokia Optical Diagnostics and Troubleshooting Course, OAM and Diagnostics Guide
NEW QUESTION # 14
Consider the exhibit. Given the following power readings, what is the calculated span loss from Node A to Node B?
- A. 8.0 dB
- B. 10.0 dB
- C. 5.0 dB
- D. 2.0 dB
Answer: B
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 # 15
Which of the following commands is used to retrieve the total output power level?
- A. show interface am2125a 1/6/lineout
- B. show interface am2125a 1/6/lineout detail
- C. show interface am2125a 1/6/lineout wavekey
- D. show interface am212 5a 1/6/lineout pm
Answer: B
Explanation:
Explanation
The command show interface am2125a 1/6/lineout detail is used to retrieve the total output power level of the AM2125A amplifier module. This command displays detailed information about the lineout interface, including the current optical power, wavelength, and status. The total output power level is shown as Output Power (dBm) in the output of this command1. References : Nokia Optical Diagnostics and Troubleshooting Course | Nokia
NEW QUESTION # 16
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 # 17
Suppose a node is experiencing a little unexpected attenuation over the Optical Supervisory Channel (OSC) transmit direction. Which of the following statements is FALSE?
- A. Traffic will pass between the local and adjacent node.
- B. A "Data Link Down" alarm will raise on the adjacent node.
- C. A Power adjustments action will fail on the local node.
- D. No OSC-related alarms will raise on the local node.
Answer: D
Explanation:
Explanation
The statement that is false is that no OSC-related alarms will raise on the local node. OSC stands for Optical Supervisory Channel, which is a dedicated wavelength used for out-of-band signaling and management of optical network elements. If a node is experiencing a little unexpected attenuation over the OSC transmit direction, it means that the OSC signal is weaker than expected when it reaches the adjacent node. This can cause a "Data Link Down" alarm to raise on the adjacent node, indicating that the OSC communication link is broken or degraded. However, this can also cause an "OSC Power Low" alarm to raise on the local node, indicating that the OSC transmit power is below the threshold. Therefore, there will be OSC-related alarms on both nodes. The other statements are true because a power adjustment action will fail on the local node due to insufficient OSC power, and traffic will pass between the nodes as long as there is no other issue affecting the data channels. References: Nokia Optical Diagnostics and Troubleshooting Course, Optical Supervisory Channel Module product data sheet
NEW QUESTION # 18
Consider the exhibit. What do the different colored green columns indicate?
- A. Optical power levels measured at different interfaces throughout the optical path of a single wavelength.
- B. Optical power levels measured for multiple wavelengths against a specific interface.
- C. Optical power levels measured multiple times against a specific interface, at 24-hour intervals for the same wavelength.
- D. The average optical power levels measured for multiple wavelengths throughout their shared optical path.
Answer: A
Explanation:
Explanation
The exhibit shows a graph of optical power levels measured at different interfaces throughout the optical path of a single wavelength. The different colored green columns indicate the optical power levels at different points along the optical path, such as the transmitter, the receiver, and the amplifiers. The graph also shows the expected power levels and the allowed deviation range for each point. The graph can be used to monitor the performance and quality of the optical signal and to identify any potential issues or anomalies. The other options are incorrect because they either describe a different type of graph or do not match the exhibit. References: Nokia Optical Diagnostics and Troubleshooting Course, OAM and Diagnostics Guide
NEW QUESTION # 19
On a bidirectional optical amplifier configuration, which of the following are Wavelength Tracker detection points?
- A. An optical amplifier has no Wavelength Tracker detection points.
- B. LINEOUT and SIGOUT interfaces.
- C. LINE and SIG interfaces.
- D. SIG interface only.
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 # 20
Consider the exhibit. A single directional fiber cut is occurring between two amplifiers in bidirectional configuration. Which node(s) will report a "LD Input LOS" alarm?
- A. Node A only
- B. Node A and Node B
- C. Node B only
- D. Node C only
Answer: C
Explanation:
Explanation
The exhibit shows a diagram of a network of nodes and edges, where a single directional fiber cut is occurring between two amplifiers in bidirectional configuration. The node that will report a "LD Input LOS" alarm is node B only. A "LD Input LOS" alarm indicates that the input signal to the laser diode (LD) of an amplifier is lost or below the threshold3. In this case, node B will not receive any signal from node A due to the fiber cut, and will generate this alarm. Node A will not report this alarm, because it can still receive a signal from node C through the other fiber. Node C will not report this alarm either, because it is not directly affected by the fiber cut between node A and node B. References : Nokia Optical Diagnostics and Troubleshooting Course | Nokia, Troubleshooting Guide for Synchronous Digital Hierarchy - Cisco
NEW QUESTION # 21
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 # 22
Suppose a "Channel Absent" alarm is reported on an 1830 PSS node. What is the recommended order for the following troubleshooting steps?
- A. 1. Go to the suspected troubled node / card / port and look at Wave Keys (in / out).
2. Retrieve the cross-connection (XC) details and see what Wave Keys should be present.
3. Check observed Wave Keys against expected Wave Keys.
4. Retrieve the channel power trace. - B. 1. Retrieve the cross-connection (XC) details and see what virave Keys should be present.
2. Go to the suspected troubled node / card / port and look at Wave Keys (in / out).
3. Retrieve the channel power trace.
4. Check observed Wave Keys against expected Wave Keys. - C. 1. Check observed Wave Keys against expected Wave Keys.
2. Go to the suspected troubled node / card / port and look at Wave Keys (in / out).
3. Retrieve the channel power trace.
4. Retrieve the cross-connection (XC) details and see what Wave Keys should be present. - D. 1. Retrieve the channel power trace.
2. Retrieve the cross-connection (XC) details and see what Wave Keys should be present.
3. Go to the suspected troubled node / card / port and look at Wave Keys (in / out).
4. Check observed Wave Keys against expected Wave Keys.
Answer: D
Explanation:
Explanation
The recommended order for the troubleshooting steps is B, 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 channel absent issue1.
* Retrieve the cross-connection (XC) details and see what Wave Keys should be present. This step is necessary to verify which Wave Keys are expected to be present on the node, card, and port based on the XC configuration2. Wave Keys are unique identifiers for wavelength tracking that are encoded by Optical Transponders (OTs) into each service wavelength direction3.
* Go to the suspected troubled node / card / port and look at Wave Keys (in / out). This step is helpful to compare the observed Wave Keys with the expected Wave Keys, and to locate the source of the problem. If a Wave Key is missing or mismatched, it means that there is a channel absent issue on that node, card, or port4.
* Check observed Wave Keys against expected Wave Keys. This step is the final solution to resolve the issue and restore the normal operation of the node. The observed Wave Keys should match the expected Wave Keys based on the XC configuration. If not, the XC configuration should be corrected or the faulty node, card, or port should be replaced5. 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
A "Power Adjustment Required" alarm was raised on the ingress amplifier in slot 1/10. Which of the following commands should be entered to manually adjust the related amplifier optical power levels?
- A. config powermgmt ingress 1/10 power adjustment
- B. config powermgmt ingress 1/10 adjust
- C. config powermgmt ingress 1/10
- D. config powermgmt ingress 1/10 scot
Answer: B
Explanation:
Explanation
A "Power Adjustment Required" alarm is raised when the optical power levels of an amplifier are out of the expected range and need to be adjusted. To manually adjust the related amplifier optical power levels, the command config powermgmt ingress 1/10 adjust should be entered. This command will initiate a power adjustment process for the ingress amplifier in slot 1/10, which is the input port for the optical line signal. The command will also display the status and results of the power adjustment, such as success, failure, or conditional success. The other commands are incorrect because they either do not initiate a power adjustment process or have invalid syntax. References: Nokia Optical Diagnostics and Troubleshooting Course, OAM and Diagnostics Guide
NEW QUESTION # 24
Which of the following Performance Measurement (PM) type is NOT typically retrieved at an Optical Transponder (OT) line interface?
- A. Optical Power Received (OPR)
- B. Digital Wrapper (DW)
- C. Forward Error Correction - Errors Counted (FEC-EC)
- D. Ethernet collision counters
Answer: D
Explanation:
Explanation
Performance Measurement (PM) is a feature that collects and reports various statistics related to the performance of an optical network element. PM data can be retrieved at different levels, such as Optical Channel (OCh), Optical Channel Data Unit (ODU), Optical Channel Transport Unit (OTU), and Ethernet. An Optical Transponder (OT) is a device that converts an electrical signal into an optical signal and vice versa. An OT has two interfaces: a client interface and a line interface. The client interface connects to the service provider network, while the line interface connects to the optical transport network. At the OT line interface, PM data can be retrieved for the OCh, ODU, OTU, and Digital Wrapper (DW) levels. The DW is a layer that encapsulates the client signal and provides overhead information for monitoring and management purposes.
Ethernet collision counters are not typically retrieved at the OT line interface, as they are related to the Ethernet level, which is usually monitored at the client interface. 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 # 25
What is the default severity level for a Threshold Crossing Alert (TCA) alarm?
- A. Major
- B. Critical
- C. Warning
- D. Minor
Answer: C
Explanation:
Explanation
A Threshold Crossing Alert (TCA) alarm is a type of alarm that indicates that a monitored parameter has crossed a predefined threshold. For example, a TCA alarm can be triggered when the optical power received at a port is too high or too low. The default severity level for a TCA alarm is warning, which means that it does not affect the service but may require attention. The other severity levels are critical, major, and minor, which indicate different degrees of impact and urgency of the alarms. The severity level of a TCA alarm can be changed by the user using the Nokia 1830 Engineering and Planning Tool (EPT) or the Nokia 1350 Optical Management System (OMS). References: Nokia Optical Diagnostics and Troubleshooting Course, Nokia 1830 PSS-32 and PSS-16 Photonic Service Switch Release 8.0 Alarms and Conditions Reference Guide
NEW QUESTION # 26
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 = 5
(ii) number of serviceaffectingalarms = 2
(Hi) number of conditions = 14 - B. (i) total number of alarms = 4
(ii) number of service affecting alarms = 14
(iii) number of conditions = 2 - C. (i) total number of alarms = 2
(ii) number of service affecting alarms = 2
(Hi) number of conditions = 18 - D. (i) total number of alarms = 7
(ii) number of service affecting alarms = 5
(Hi) number of conditions = 7
Answer: D
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 # 27
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Nokia 4A0-265 exam consists of 60 multiple-choice questions and has a time limit of 90 minutes. 4A0-265 exam covers a range of topics related to optical network diagnostics and troubleshooting, such as optical network design and architecture, fiber optic technology, optical network testing and measurement, and troubleshooting techniques. Candidates are required to have a good understanding of these topics in order to pass the exam.
To prepare for the Nokia 4A0-265 Certification Exam, candidates must have a comprehensive understanding of optical networks and their components. They must also have experience in troubleshooting and diagnosing optical networks, and be familiar with the latest industry standards and best practices. 4A0-265 exam is challenging, and candidates must invest significant time and effort in preparing for it.
Nokia 4A0-265 exam is specifically designed for those who are involved in the design, deployment, and maintenance of optical networks. It covers a wide range of topics including fiber optic transmission systems, optical network architecture, and troubleshooting techniques. 4A0-265 exam consists of multiple-choice questions and is conducted online.
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