Adding network surveillance cameras to an existing Ethernet network will benefit from using VLANs (Virtual Local Area Networks) to keep the surveillance video separate from other network traffic. This separation reduces the risk of network congestion by prioritizing surveillance video traffic and ensuring sufficient bandwidth is available for video data. VLANs enhance network performance and security by segmenting traffic and minimizing interference from other network activities.

For an outdoor school playground, the most appropriate IP rating is IP67. This rating indicates that the camera is completely protected against dust (the first digit '6') and can withstand immersion in water up to 1 meter for
30 minutes (the second digit '7'). This level of protection is ideal for outdoor environments where the camera may be exposed to dust, rain, and other environmental factors.
References: Axis Communications Outdoor Cameras

Pixel density describes the number of pixels per meter (or foot) horizontally. This metric is crucial for determining the level of detail that a camera can capture over a given area, affecting the clarity and usability of the video for tasks such as identification and recognition. Higher pixel density results in better image detail.
Axis Communications' technical resources on image quality and resolution confirm this definition of pixel density.

AXIS Device Manager is free of charge. This tool provides comprehensive management capabilities for Axis devices without any additional licensing fees. It allows users to efficiently manage, configure, and maintain their Axis network cameras and other devices, ensuring optimal performance and security. Axis offers this tool as part of their commitment to providing user-friendly and cost-effective solutions, as detailed in their product information and support resources.
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Existing coaxial cables can be repurposed for use with network cameras through the use of media converters.
These devices convert the analog signals transmitted over coaxial cables into digital signals that can be used by network cameras, allowing for the continued use of existing cabling infrastructure. This approach can be cost-effective and less disruptive compared to installing new network cables. Axis Network Video documentation provides detailed guidance on the use of media converters to leverage existing coaxial cabling for network camera installations.