Reference charts and tables

The tables worth bookmarking. DORI thresholds, PoE classes, bitrate by resolution, cable limits and storage by camera count.

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14 pages

• Typical Security Camera Bitrate by Resolution

  Typical sustained H.264 and H.265 bitrate by camera resolution, an industry convention not a standard, converted to MB per hour and GB per day.

• Camera Mounting Height and Blind Spot Chart

  Down-tilt angle and the dead zone directly beneath a camera, by mount height, target distance and lens, computed from standard tilt geometry.

• Security Camera Resolution Comparison

  From 2MP to 12MP: pixel dimensions, megapixels, DORI identify distance on a 4 mm lens, and storage cost per resolution in one comparison table.

• Cloud Camera Subscription Cost Over Five Years

  Cloud subscription cost over one, three and five years against real local PoE hardware prices from the current catalog, with break-even months.

• The DORI Standard: Pixels Per Metre Explained

  EN 62676-4 sets four DORI levels, detect, observe, recognise, identify, in pixels per metre of scene width. Full threshold table plus distance-by-lens examples.

• Ethernet Cable Length Limits for PoE Cameras

  ANSI/TIA-568 caps an Ethernet channel at 100 metres total: 90 metres of solid horizontal cable plus 10 metres of patch leads. Full margin table by run length.

• IP Weather Rating Chart for Outdoor Cameras

  How to read an IEC 60529 IP code digit by digit, and which combined rating an outdoor security camera actually needs against rain, dust and jets.

• Security Camera Lens Field of View Chart

  Horizontal and vertical field of view by focal length on a 1/2.8 inch sensor, plus scene width at distance. Standard lens geometry, computed and checked.

• microSD Card Recording Time Chart

  microSD recording days by card capacity and resolution, computed from this site's H.265 bitrate assumptions, continuous against motion-only recording.

• NVR Channel Capacity and Camera Count Chart

  NVR channel size against camera count, with the 30-day storage and PoE switch budget each count implies, plus current catalog recorder prices.

• PoE Standards and Power Classes

  IEEE 802.3af, at, and bt define nine PoE classes. Full table of switch-side power, camera-side power, and cable loss allowance for each class.

• PoE Switch Budget Chart by Camera Count

  PoE switch power budget by camera count and IEEE 802.3 class, calculated on the switch reservation, never on the camera's own stated power draw figure.

• NVR Storage Needed by Camera Count

  Usable TB needed for 14 and 30 day retention by camera count, at typical 4MP and 8MP/4K bitrates, plus how long common 4TB and 8TB drives actually last.

• Security Camera Upload Bandwidth Chart

  Camera upload bandwidth and monthly data by camera count and resolution, plus what percent of common home upload speeds that traffic load actually consumes.