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| Section | Objectives |
|---|---|
| Network Operations in 5G RAN | - Remote operation of 5G Radio Access Network
|
| 5G RAN Systems and Fault Management | - Software and configuration management
|
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質問 # 38
While remotely piloting an RF unit replacement, the NOC engineer notices the new unit is detected but the cell fails to come into service, with an alarm indicating a CPRI/eCPRI configuration mismatch. What is a likely cause that the NOC and field engineer should jointly investigate?
正解：C
解説：
A CPRI/eCPRI configuration mismatch alarm following a hardware replacement often indicates that the physical connection topology does not align with what the system's configuration expects - commonly because the replacement RF unit was connected to a different physical port on the baseband module than the original unit occupied. Since configuration data often references specific port mappings to associate logical cell configurations with specific physical RF unit connections, a port mismatch can prevent the system from correctly associating the detected hardware with the expected configuration, resulting in the cell failing to come into service despite the link being physically established. The NOC engineer should work with the field engineer to confirm exactly which physical port the new unit is connected to and compare this against the expected port mapping in the configuration, correcting either the physical connection or the configuration as appropriate. Cosmetic details such as cable ties or paint color, and unrelated identifiers like PLMN ID, have no bearing on this type of technical mismatch.
質問 # 39
A NOC team uses NetAct to download a new software package to a group of base stations during business hours, but schedules the activation of that software for later that night. What is the primary operational benefit of this 'download now, activate later' approach?
正解：C
解説：
Software lifecycle management for base stations typically separates the download (transfer) phase from the activation phase, because each has different operational implications. Downloading a software package involves transferring a potentially large file to the base station's storage, which consumes transport bandwidth and storage I/O but does not itself interrupt the cell's current operation, since the existing software load continues running unaffected. Activation, by contrast, involves switching to the new software load, which typically requires the affected unit to restart and briefly interrupts service. By downloading during business hours - when transport capacity may be more available and the activation step has not yet occurred - and scheduling activation for a low-traffic maintenance window, the NOC minimizes both the duration of any service interruption and its impact on subscribers. This separation does not eliminate the need for backups, nor does activation occur automatically; it is explicitly scheduled or triggered as a distinct step.
質問 # 40
Which AirScale management tool allows an engineer to connect directly to a single base station for local-level configuration viewing and diagnostics, as opposed to network-wide centralized management?
正解：D
解説：
The BTS Site Manager, also referred to as the local Element Manager, is the tool used to connect directly to an individual AirScale base station to view its local configuration, hardware inventory, logs, and run element- level diagnostics. It is typically used when an engineer needs granular, site-specific information that may not be fully visible through the centralized system, or when NetAct connectivity to the site is impaired. NetAct CM Editor is used for network-wide configuration management of many sites from the central OSS, NetAct PM Reports aggregates performance counters across the network, and the SON Network Optimizer automates parameter tuning across multiple cells. Because the question specifically asks about direct, single-element access for local diagnostics rather than network-wide operations, the BTS Site Manager is the correct answer, complementing NetAct in a complete remote operations toolkit.
質問 # 41
What is the primary purpose of performing a configuration audit that compares a live network element's current parameter settings against an approved configuration baseline or template?
正解：C
解説：
A configuration audit compares the actual, currently applied parameter settings on a live network element against a reference baseline or approved configuration template that represents the intended, standardized configuration for that element type or role. The primary purpose of this comparison is to detect configuration drift - differences that may have arisen from unauthorized manual changes, incomplete rollbacks, errors during bulk updates, or undocumented local modifications. Identifying such deviations is important for maintaining configuration integrity across the network, ensuring consistent behavior across similar cells, supporting troubleshooting (since unexpected parameter values are a common root cause of localized issues), and meeting internal governance or regulatory compliance requirements around change control. This process is distinct from performance monitoring (PRB utilization, handover success rate), which relies on PM counters, and from fault management, which tracks active alarms - configuration audits specifically address the state of configuration parameters themselves.
質問 # 42
Why is an automatic fallback (rollback) mechanism important when activating new software on a base station?
正解：A
解説：
An automatic fallback mechanism is a critical safeguard in software lifecycle management. After activating a new software load, the base station undergoes a defined health-check period during which it must successfully come into normal operational state - for example, cells returning to service without critical faults. If this does not occur within the configured timeout, the automatic fallback mechanism reverts the unit to the previous software load that was known to be working, restoring service without requiring a NOC engineer to manually diagnose and correct the issue in real time. This significantly limits the duration and impact of a failed activation, which is especially important for remote sites where physical intervention would be slow. This mechanism does not delete the previous version immediately (it must remain available for the fallback to function), does not eliminate the need for post-activation monitoring, and does not automatically propagate changes to other base stations, which remains a separately scheduled and monitored activity.
質問 # 43
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