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| Section | Objectives |
|---|---|
| Remote Operations of 5G Radio Access Networks | - 5G RAN Operations Center Procedures
|
| Fault and Alarm Management | - Monitoring and Troubleshooting
|
| 5G RAN Products and Solutions Management | - Network Connectivity and Access
|
| Configuration Management | - Parameter Administration
|
| Software Management | - Base Station Software Operations
|
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NEW QUESTION # 69
Before activating a newly downloaded software package on a base station, why is it important to verify software compatibility with the unit's current hardware and configuration?
Answer: A
Explanation:
Verifying that a software package is compatible with a base station's specific hardware variants, installed modules, and current configuration before activation helps avoid activation failures or operational issues that can arise when a software load does not properly support the hardware it is being applied to, or when configuration elements are incompatible with structural changes introduced in the new software. While an automatic fallback mechanism may eventually recover the unit to its previous working state if activation fails, relying on fallback as the primary safeguard introduces avoidable service disruption and consumes a maintenance window without achieving the intended upgrade. Compatibility considerations are relevant across all supported technologies within Nokia's Single RAN portfolio, not just legacy systems, and compatibility checks are a software lifecycle planning activity - they do not update physical inventory records or remove the need for post-activation health monitoring, which remains essential regardless of how thorough the pre-activation checks were.
NEW QUESTION # 70
A cell repeatedly raises and clears 'Cell Unavailable' alarms. Performance data shows PRB utilization dropping to zero during exactly the same periods. Which area should be investigated FIRST as the likely root cause?
Answer: A
Explanation:
When a cell repeatedly raises and clears 'Cell Unavailable' alarms, and PRB utilization simultaneously drops to zero during exactly those same intervals, this pattern strongly indicates the cell is genuinely going out of service intermittently, rather than a display or reporting artifact. The investigation should focus on causes capable of producing repeated, short-duration outages: transport link instability (brief link flaps causing loss of the cell's connectivity), loss of synchronization reference (particularly significant for TDD 5G, where sync loss can force a cell to stop transmitting to avoid interference), or unexpected hardware resets/restarts of the baseband or radio unit, potentially linked to environmental issues such as overheating or power fluctuations.
NetAct UI theme settings, subscriber handset models, and the billing system are entirely unrelated to RAN service availability and would not explain this correlated alarm and KPI pattern. Correlating alarm timing with PM data and environmental/transport alarms is a key NOC diagnostic technique.
NEW QUESTION # 71
A NOC team is investigating a degradation in E-RAB / QoS flow setup success rate for a specific gNB.
Which approach is MOST effective for identifying the root cause?
Answer: C
Explanation:
Investigating a degradation in E-RAB or 5G QoS flow setup success rate for a specific gNB is most effectively approached by correlating multiple data sources covering the affected time period: checking active alarms on that gNB (hardware, transport, or signaling faults), reviewing the configuration management audit trail for any recent parameter change that coincided with the degradation, and examining relevant performance counters such as resource availability/congestion indicators, transport interface statistics, and signaling success/failure counts. This multi-source correlation identifies whether the degradation stems from a hardware fault, a configuration error, a capacity constraint, or a transport issue, enabling targeted remediation. Reviewing only high-level summary reports lacks the technical granularity required. Restarting NetAct is a drastic, unfocused action unrelated to a single gNB's issue and risks disrupting network-wide monitoring. Assuming the cause is always subscriber devices, without first checking network-side data, skips the most relevant and controllable areas of investigation.
NEW QUESTION # 72
After a field engineer replaces a Tower Mounted Amplifier (TMA), what remote check should the NOC engineer perform to confirm the new TMA is correctly configured and operating within expected parameters?
Answer: A
Explanation:
A Tower Mounted Amplifier (TMA) is an Antenna Line Device that, like a RET unit, communicates over the AISG bus and has configurable operational parameters - notably its gain settings (which affect uplink signal amplification) and bias/power settings. After a TMA replacement, the appropriate remote verification is to confirm the new unit is detected on the AISG bus (confirming physical and communication-layer connectivity) and that its gain and bias settings can be read and correspond to the values expected for that antenna line's configuration, ensuring the device is operating within the parameters the radio link design assumes. Incorrect TMA gain settings can affect uplink sensitivity and noise figure, impacting uplink performance KPIs. Physical attributes such as housing color or weight have no bearing on functional verification, and TMA replacement has no relationship to the cell's PLMN ID, which is a network identity parameter entirely independent of antenna line equipment.
NEW QUESTION # 73
During remote piloting of a RET replacement, the field engineer reports that the new RET unit is physically connected, but the NOC engineer cannot detect it during an AISG device scan, while other ALDs on the same antenna line are detected normally. What is a likely cause the NOC engineer should consider?
Answer: A
Explanation:
When other Antenna Line Devices on the same AISG bus are detected normally but a newly connected device is not, two likely causes should be considered. First, AISG devices are addressed individually on the shared bus, and if the new RET unit has a factory-default or previously configured address that conflicts with an address already in use by another device on the same line, it may fail to respond correctly during discovery due to this addressing conflict. Second, despite being reported as 'physically connected,' there may be a faulty or incomplete connection specific to that device's bus connection point - such as a loose connector at the device itself - that does not affect the other devices already established on the line. The NOC engineer should work with the field engineer to check for addressing conflicts (potentially requiring the new device's address to be changed) and to verify its specific bus connection. RET tilt range, NR-ARFCN, and Tracking Area Code have no relevance to AISG device discovery issues.
NEW QUESTION # 74
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