Setting up a security system can seem overwhelming, especially for first-time homeowners or small business operators.

Issues like blurry night vision, lagging remote access, or unresponsive cameras are common—but most problems can be avoided with proper planning and knowledge.

At WEILAILIFE, we’ve created a comprehensive guide covering essential camera knowledge, installation practices, and troubleshooting tips to help you get your system right the first time.

1.Understanding Core Security System Parameters

Resolution and Pixels

Pixels indicate sensor specification, resolution stands for display definition.

Higher pixels deliver clearer images yet consume more bandwidth and storage space.

Home & small office: 4MP balances clarity and cost

Storehouse & commercial area: 8MP 4K captures tiny details such as barcodes

Lens and Field of View

Practical matching reference:

2.8mm：About 90° wide view, for elevator, narrow corridor, monitoring range within 5 meters

4mm：About 65° view, for office, shop interior, monitoring range within 10 meters

6mm：About 45° view, for courtyard, parking lot, monitoring range within 20 meters

12mm：About 25° narrow view, for fixed key monitoring points within 30 meters

Simple selection rule: Monitoring distance ÷ 2 ≈ suitable lens focal length

Glass lens has better light transmittance than plastic lens, greatly improving night vision effect.

Night Vision Performance

Infrared night vision: full dark monitoring, black-and-white image, cost-effective

Full-color night vision: built-in soft fill light, colored footage at night, more suitable for family scenarios

Large-size sensor effectively reduces night video noise and makes footage cleaner.

Bitrate and Storage Calculation

Main stream: high-definition recording and local storage

Sub stream: low-flow compression, dedicated for mobile  remote preview

Daily storage formula:

Daily occupied storage (GB) = Bitrate (Mbps) × 86400 ÷ 8 ÷ 1024

Surveillance dedicated hard drive is recommended, supporting 24-hour uninterrupted cyclic reading and writing.

2. Selecting the Right Security Camera by Scenarios

Divided by Using Environment

Outdoor cameras: reach IP66 and above waterproof and dustproof grade; coastal areas choose anti-corrosion models

Indoor cameras: IP30 basic protection is enough; dome for ceiling installation, bullet for wall installation

Special environment: garage, elevator etc. adopt anti-electromagnetic interference cameras

Strong light backlight scene: prioritize WDR wide dynamic camera

Divided by Practical Functions

Face recognition monitoring: above 4MP, match 4-6mm lens

License plate capture: high frame rate ≥25fps + WDR function, weaken headlight glare

Two-way audio: support remote voice intercom, convenient for home care and store communication

PoE network camera: single network cable supplies power and network, easy construction

3. Standard Installation Specifications

Camera Installation Height

• Outdoor bullet camera: install height ≥3.5 meters, prevent artificial damage
• Indoor dome camera: install height ≥2.5 meters, wide viewing field without dead angle
• License plate dedicated camera: install height 1.5-2 meters, easy to capture license plate clearly

Line Layout Standard

• Network cable: conventional distance within 100 meters uses Cat5e; gigabit network chooses Cat6
• PoE transmission limit: within 100 meters; beyond that match PoE extender or fiber transceiver
• Strong and weak current separation: keep monitoring cables more than 30cm away from high-voltage wires

Equipment Placemen

Camera brackets must be firmly fixed to avoid picture jitter caused by wind shaking.

NVR recorder and switch are placed in dry and ventilated position; heat dissipation equipment is added when ambient temperature is too high.

4. Device Debugging & Remote Access Setting

Check actual voltage of DC12V power supply, keep it between 11.5V-12.5V.
Unify cameras and NVR in the same local area network segment, freely choose DHCP automatic IP or fixed static IP.

For remote viewing, complete router port mapping and enable DDNS dynamic domain name to realize cross-network access anytime and anywhere.

After setting, test multi-terminal login to ensure stable live stream playback.

5. Daily Maintenance & Common Fault Solutions

Routine Maintenance Work 

Clean lens surface dust and check line aging and hard disk status every quarter.

Back up important video records regularly; upgrade device firmware after backing up configuration data.

Quick Troubleshooting

• Blurry night vision: clean infrared fill light, avoid facing reflective walls and windows
• Slow remote viewing: optimize sub stream parameters, reduce extra network occupancy
• Frequent offline disconnection: check PoE power supply stability and local area network IP conflict

6. Conclusion