A Passive Wi-Fi Survey is a wireless assessment methodology that collects information about the RF environment without associating to the wireless network. Survey software listens to wireless transmissions from nearby access points and records coverage, signal quality and other RF metrics throughout the environment.
Why Are Passive Surveys Important?
Passive surveys provide visibility into wireless coverage and RF conditions without requiring network access or authentication.
They are commonly used during wireless design, validation and troubleshooting activities to assess the overall health of the RF environment.
What Is Measured During A Passive Survey?
- Signal Strength - Measures wireless coverage throughout the environment.
- Signal Quality - Evaluates the quality and usability of wireless signals.
- Noise Levels - Assesses background RF activity that may impact performance.
- Channel Utilisation - Helps identify congested channels and airtime usage.
- Access Point Visibility - Identifies nearby wireless networks and coverage overlap.
When Should Passive Surveys Be Used?
Passive surveys are commonly used during wireless site surveys, predictive design validation and troubleshooting engagements.
They are particularly valuable when assessing coverage requirements and understanding the RF environment before making design decisions.
Benefits Of Passive Surveys
- Coverage Assessment - Provides visibility into wireless coverage across an environment.
- RF Analysis - Helps identify signal quality and RF-related issues.
- Supports Design Validation - Assists with confirming design objectives have been achieved.
- No Network Access Required - Can be performed without associating to the wireless network.
Passive Surveys vs Active Surveys
Passive surveys observe wireless activity without connecting to the network.
Active surveys involve associating to the wireless network and measuring connectivity and performance from a connected state.
Both survey methodologies provide valuable insights and are often used together as part of a broader wireless assessment.
Key Points
- Passive surveys do not associate to the network.
- They assess coverage and RF performance.
- Signal quality and channel utilisation can be measured.
- They are commonly used for design and troubleshooting.
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