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| Section | Objectives |
|---|---|
| 5G RAN Products and Solutions Management | - Network Connectivity and Access
|
| Fault and Alarm Management | - Monitoring and Troubleshooting
|
| Configuration Management | - Parameter Administration
|
| Software Management | - Base Station Software Operations
|
| Remote Operations of 5G Radio Access Networks | - 5G RAN Operations Center Procedures
|
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NEW QUESTION # 103
What is the primary purpose of the Tracking Area Code (TAC) configured on a 5G cell?
Answer: D
Explanation:
The Tracking Area Code (TAC) is a configuration parameter that groups one or more cells into a Tracking Area, which the core network uses to manage UE location tracking while a device is in idle mode. When a UE moves between cells within the same Tracking Area, it does not need to perform a tracking area update, reducing signaling overhead. When a UE moves to a cell with a different TAC, it triggers a tracking area update procedure so the core network knows which area to page the UE in when there is incoming traffic.
Proper TAC planning is important: areas that are too large can increase paging load across many cells, while areas that are too small can increase signaling load from frequent tracking area updates. TAC has no relationship to hardware vendor identification, transmit power limits, or software versioning, which are configured and managed through entirely separate parameters and processes.
NEW QUESTION # 104
A 'Loss of Synchronization Reference' alarm appears on a 5G cell. Which input to the BTS is this alarm most directly associated with?
Answer: D
Explanation:
5G base stations require accurate frequency, and for many configurations (especially TDD operation and features like carrier aggregation) phase/time synchronization, typically derived from a GNSS receiver such as GPS or from a network-distributed timing source such as Synchronous Ethernet or PTP/IEEE 1588 over the transport network. A 'Loss of Synchronization Reference' alarm indicates the BTS has lost access to its timing source. This can lead to degraded performance and, in TDD deployments, can cause uplink/downlink timing misalignment between neighboring cells (interference), and may force the cell out of service if synchronization cannot be maintained. The correct troubleshooting focus is therefore the GNSS antenna
/receiver, related cabling, satellite visibility/obstructions, or the alternative network-based synchronization path - not neighbor relation configuration, handover KPIs, or NetAct account credentials, none of which relate to the BTS's timing reference source.
NEW QUESTION # 105
A NOC engineer 'acknowledges' an active alarm in NetAct FM. What does this action signify?
Answer: D
Explanation:
Acknowledging an alarm in NetAct FM is an administrative action that marks the alarm as having been seen and taken ownership of by an engineer, without changing the underlying fault condition itself. In a NOC environment where multiple engineers or shifts monitor shared alarm lists, acknowledgement communicates that someone is already aware of and working on the issue, helping to avoid duplicated troubleshooting effort and providing a basic accountability trail for follow-up. It does not automatically resolve or repair the underlying fault - the alarm will only clear once the actual condition causing it is resolved, whether automatically by the network recovering or through engineer intervention. Acknowledgement also does not cause the base station to reboot, and acknowledged alarms remain visible in the active list (not deleted) until the underlying condition clears, at which point they typically move to the alarm history.
NEW QUESTION # 106
A NOC engineer observes that a 5G cell's average downlink user throughput has dropped significantly, but the cell's PRB utilization remains low and no transport alarms are active. Which root cause is most consistent with these observations?
Answer: A
Explanation:
When PRB utilization is low, the cell is not resource-constrained, which rules out congestion as the cause of reduced throughput. A complete transport failure or an administrative lock would prevent the cell from carrying any traffic at all, which contradicts the scenario where the cell is still active and reporting measurements. The most consistent explanation is degraded radio conditions - for example, increased interference, reduced signal-to-noise ratio (SINR), or coverage issues - which force the scheduler to select lower-order Modulation and Coding Scheme (MCS) values for connected users. Lower MCS values mean each allocated resource block carries fewer bits, directly reducing achievable throughput even though plenty of PRB capacity remains available. Investigating MCS distribution counters and SINR-related measurements alongside checking for nearby interference sources or antenna/feeder issues would be the appropriate next troubleshooting step.
NEW QUESTION # 107
Why is it important for NOC personnel to establish a KPI baseline for each cell or site before evaluating whether current performance indicates a problem?
Answer: D
Explanation:
Establishing a KPI baseline for each cell or site - representing typical performance under normal operating conditions, accounting for factors such as time-of-day traffic patterns, geography, and cell configuration - provides the reference point against which current performance can be meaningfully compared. Without a baseline, it is difficult to tell whether an observed KPI value represents a genuine degradation requiring investigation, or simply normal variation for that particular cell. For example, a busy urban cell may normally operate with higher PRB utilization than a rural cell, so what is alarming for one cell may be entirely typical for another. Baselines support effective threshold setting for alerts, help prioritize investigation effort toward genuine anomalies, and are referenced continuously - not only during initial commissioning - whenever assessing whether performance has changed meaningfully. Baselines have no relationship to a cell's maximum transmit power, which is a separate RF configuration parameter.
NEW QUESTION # 108
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