الأمن السيبراني لأنظمة CCTV: حماية كاميراتك من القراصنة

Introduction

Every IP camera consumes network bandwidth. If your network cannot handle the combined streams of all cameras, you’ll experience lag, dropped frames, and recording gaps. Calculating bandwidth requirements before installation prevents these costly problems.

Factors Affecting Bandwidth

Four main factors determine a camera’s bandwidth: resolution (higher = more data), frame rate (more fps = more data), compression codec (H.265+ uses far less than H.264), and scene complexity (busy scenes generate more data than static ones).

Typical Bandwidth per Camera

A 4 MP camera at 25 fps using H.265+ consumes approximately 2–4 Mbps. The same camera using H.264 would need 6–10 Mbps. An 8 MP (4K) camera at 25 fps with H.265+ uses 4–8 Mbps. These are typical values; actual usage varies with scene activity.

Calculating Total Network Load

Multiply the per-camera bandwidth by the total number of cameras. Add 20% headroom for network overhead. For example, 16 cameras at 3 Mbps each = 48 Mbps + 20% = approximately 58 Mbps. A Gigabit uplink from your switch to the NVR handles this easily.

Network Design Tips

Use Gigabit PoE switches with sufficient backplane bandwidth. Keep camera traffic on a dedicated VLAN. Avoid daisy-chaining switches—use a star topology back to a central switch. For remote viewing, ensure your internet upload speed can handle the sub-streams of cameras you plan to view simultaneously.

FastEgy Recommendation

FastEgy calculates bandwidth and switch requirements for every project. We supply Hikvision managed PoE switches sized for your camera load with room for growth. Contact us for network design assistance.