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60GHz Absorption: The 60GHz band experiences significant signal attenuation due to absorption by oxygen molecules in the atmosphere. This severely restricts the usable range of wireless systems operating in this frequency.

Why Other Options Don't Apply:

Atmospheric Scattering: Impacts longer wavelength transmissions, less significant at 60GHz.

Solar Radiation: Can cause interference on some frequencies, but not a primary range limitation at 60GHz.

Rain Fade: Primarily affects higher frequencies (above 10GHz), but its impact is less severe than oxygen absorption at 60GHz.

References:

60GHz Propagation Characteristics: Technical papers discussing oxygen absorption and its influence on range limitations.

Millimeter-wave (mmWave) Communication: Overviews highlighting the challenges and short-range applications of 60GHz systems.

HTTP's Popularity: HTTP is the foundation of the web, making it widely known and supported. Developers have extensive familiarity with its concepts (methods, headers, status codes, etc.).

REST APIs and Webhooks: These often leverage HTTP for communication, building upon existing knowledge and tools.

Tradeoffs:

Security: HTTP itself is not inherently secure; HTTPS or additional layers address this.

Speed: Protocols optimized for IoT may have lower overhead, but HTTP's simplicity often outweighs minor performance differences.

References:

REST APIs: Overviews of their use of HTTP, demonstrating its prevalence in API development.

Developer Experience with HTTP: Discussions on the familiarity with and availability of HTTP libraries in various programming languages

Health IoT Device Categories:

Wearable: Devices worn on the body (smartwatches, fitness trackers).

Non-wearable: Devices used without being worn (smart scales, connected medical equipment).

Implantable: Surgically inserted devices (pacemakers, glucose monitors).

References

Health IoT: Resources on healthcare + IoT will illustrate device types.

Smart Building Core Benefit: Smart building technologies primarily aim to optimize a building's operational efficiency through automation and data-driven insights.

Efficiency Examples:

Energy Management: Automated lighting and HVAC control based on occupancy and environmental conditions.

Maintenance: Predictive maintenance through IoT sensors reduces downtime.

Space Utilization: Optimization of space allocation based on real-time usage patterns.

References

Smart Buildings: https://en.wikipedia.org/wiki/Smart_building

Articles on Benefits of Smart Buildings: A quick search will yield many resources detailing these advantages.

Attenuation: Describes the progressive loss of signal strength as it travels through a medium (like air, cables, walls). It's caused by factors like absorption, distance, and obstacles.

Other Phenomena:

Diffraction: Bending of waves around obstacles.

Reflection: Waves bouncing off surfaces.

**Scattering: ** Waves dispersing in multiple directions.

References

Attenuation: https://en.wikipedia.org/wiki/Attenuation

Outsourcing Knowledge Transfer: When outsourcing implementation, the service provider has firsthand knowledge of system setup and configuration. Clear documentation ensures this knowledge remains accessible to you after the project is complete.

Ongoing Support: While paid/free support options influence long-term maintenance, they won't substitute missing documentation about the specific setup.

Reducing Future Vendor Reliance: Detailed documentation helps mitigate over-reliance on the service provider for minor changes and troubleshooting, giving you more long-term autonomy.

Proof of Concept: A POC typically happens before outsourcing, and focuses on validating the solution's feasibility, not ensuring smooth knowledge transfer thereafter.

References:

Service Level Agreements (SLAs): Documentation related to outsourced work may be defined as a deliverable within an SLA.

Knowledge Management Best Practices:

Automation for Consistency: Scripts eliminate the potential for human error during repetitive configuration tasks on multiple devices. This ensures uniformity across the wireless solution.

Speed and Efficiency: Scripts can be much faster than manual configuration, particularly in large deployments.

Other Benefits: While scripts might aid signal strength (e.g., optimizing settings) or enhance solution capabilities, their core value in configuration is reducing errors.

References:

Network Automation: Benefits of using scripts for configuration management.

Configuration Management Best Practices: Emphasize the importance of consistency and repeatability.

PtMP (Point-to-Multipoint): A single access point (AP) communicates with multiple client devices. This means the AP needs to manage how the available airtime is shared among those clients.

Airtime Fairness: Mechanisms are needed to ensure that:

Each client gets a fair chance to communicate

High-priority traffic isn't starved by low-priority traffic

PtP (Point-to-Point): A dedicated link only has two devices, eliminating the need for complex airtime management.

Considerations in Both: While interference, SINR, and frequency selection are important in both PtMP and PtP systems, the need for airtime management is unique to the multipoint scenario.

References:

Wireless Network Topologies (PtP vs. PtMP): Explanations of the differences in how communication is managed in each scenario.

TDMA (Time Division Multiple Access): A common airtime sharing method used in PtMP systems.

Most Vulnerable In Transit: Sensitive data (passwords, health information, etc.) is most susceptible to interception while being sent over a wireless network. Encryption is crucial at this stage.

Encryption at Rest and in Memory: While also important, these are often handled with different cryptographic techniques depending on the system.

References:

Wireless Security Protocols: Details on encryption standards like WPA2/WPA3, TLS that focus on protecting data during transmission.

Bottom-Up Troubleshooting: The OSI model provides a structured diagnostic approach. Starting at Layer 1 ensures basic physical connectivity issues are ruled out first.

MQTT Relies on IP: MQTT operates at a higher layer of the OSI model, relying on TCP/IP (Layers 4 and 3) for communication. Problems at the physical layer will disrupt everything built upon it.

Checking the Fundamentals: Before investigating complex application issues (MQTT), verify cables, link lights, Wi-Fi signal strength, etc.

References:

OSI Model: Descriptions of the seven layers, emphasizing the foundation provided by Layer 1 (Physical).

Network Troubleshooting Guides: Resources that outline common Layer 1 problems and their symptoms.