Cambium Test Cambium Performance Tracking 2 — Questions and Answers
Question 1: In cnMaestro, which metric best indicates the overall health of a PMP 450 sector's throughput performance?
- Aggregate throughput per sector (Correct answer)
- Number of registered SMs
- Uptime percentage
- GPS sync status
Correct answer: Aggregate throughput per sector
Aggregate throughput per sector directly measures how much data the sector is successfully passing, making it the primary throughput health indicator.
Question 2: What does a rising Receive Power (RSSI) trend in cnMaestro historical graphs typically indicate for a ePMP link?
- Physical alignment may be improving or an obstruction is clearing (Correct answer)
- The SM is consuming more bandwidth
- Radio firmware needs updating
- Channel interference is increasing
Correct answer: Physical alignment may be improving or an obstruction is clearing
Rising RSSI on an ePMP link generally means the signal path is improving, often due to better physical alignment or reduced obstruction.
Question 3: Which cnMaestro report type would you use to compare performance across multiple towers over a 30-day period?
- Network Summary Report (Correct answer)
- Device Alarm Report
- SM Session Log
- RF Spectrum Report
Correct answer: Network Summary Report
The Network Summary Report aggregates performance data across multiple sites and supports custom date ranges including 30-day windows.
Question 4: When tracking ePMP 3000 performance, what does a high 'Retry Rate' percentage on the downlink signify?
- RF channel conditions are degraded, causing frequent retransmissions (Correct answer)
- The AP is operating at maximum capacity
- SM registration is unstable
- GPS synchronization is lost
Correct answer: RF channel conditions are degraded, causing frequent retransmissions
A high retry rate means the receiver is not acknowledging frames on the first transmission, which is a symptom of poor RF channel quality.
Question 5: In Cambium's performance framework, what is the purpose of monitoring 'Airtime Utilization' on a PMP sector?
- To determine how close the sector is to its capacity ceiling (Correct answer)
- To measure GPS clock accuracy
- To track firmware update schedules
- To log SM authentication events
Correct answer: To determine how close the sector is to its capacity ceiling
Airtime utilization shows the percentage of available transmission time being consumed, directly revealing how close the sector is to full capacity.
Question 6: Which threshold, when exceeded for downlink MCS on a cnWave 60 GHz link, typically indicates a well-performing backhaul path?
- MCS 9 or higher sustained over time (Correct answer)
- MCS 1 with low error rate
- MCS 4 with 50% airtime utilization
- Any MCS with zero retries
Correct answer: MCS 9 or higher sustained over time
MCS 9 and above on a cnWave link indicates strong signal quality enabling high-order modulation, which is the hallmark of a well-performing 60 GHz path.
Question 7: When using cnMaestro's performance dashboard, what action should be taken if a device consistently shows in the 'Poor' health band?
- Investigate RF environment, check alignment, and review interference sources (Correct answer)
- Immediately replace the device hardware
- Increase transmit power to maximum
- Disable QoS policies on the sector
Correct answer: Investigate RF environment, check alignment, and review interference sources
Persistent 'Poor' health scores warrant a systematic investigation of RF factors—alignment, interference, and obstructions—before considering hardware replacement.
Cambium Test Cambium Performance Tracking 2
In cnMaestro, which metric best indicates the overall health of a PMP 450 sector's throughput performance?