❣️: CCTV
CCTV (Closed-circuit Television) एक प्रकार की निगरानी प्रणाली को संदर्भित करता है जो वीडियो सिग्नल को मॉनिटर के एक विशिष्ट, सीमित सेट पर प्रसारित करने के लिए Cameras का उपयोग करता है। CCTV के कुछ प्रमुख पहलू इस प्रकार हैं:
Types of CCTV Cameras:
1)
Dome Cameras
2)
Bullet Cameras
3)
PTZ (Pan-Tilt-Zoom) Cameras
4)
IP (Internet Protocol) Cameras
5)
Analog Cameras
Components of a CCTV System:
1)
Cameras
2)
DVR (Digital Video Recorder) or NVR (Network
Video Recorder)
3)
Monitors
4)
Cables and Connectors
5)
Power Supply
Features of CCTV:
1)
Video Recording
2)
Motion Detection
3)
Night Vision
4)
Weather Resistance
5)
Remote Access
Applications of CCTV:
1)
Security and Surveillance
2)
Law Enforcement
3)
Retail and Commercial
4)
Industrial and Manufacturing
5)
Residential and Home Security
Benefits of CCTV:
1)
Deterrent to Crime
2)
Realtime Monitoring
3)
Video Evidence
4)
Improved Safety
5)
Reduced Liability
❣️: Analog CCTV system all materials.
Analog CCTV System Materials:
Cameras:
A.
Analog CCTV cameras (indoor, outdoor, dome,
bullet)
B.
Types: Dome, bullet, box, PTZ, night vision,
weather, resistant
C.
Resolution: 420700 TVL (TV lines)
D.
Sensor: CCD or CMOS
E.
Lens: Fixed, varifocal, or zoom
F.
Iris control: Manual or autoiris
G.
White balance: Automatic or manual
H.
AGC: Adjustable gain control
I.
BLC: Backlight compensation
J.
IR LEDs (for night vision)
Cables:
A.
Coaxial cables (RG59, RG6)
B.
Power cables (2core, 4core)
C.
Video baluns (for signal transmission)
D.
RG59: Thinner, more flexible, up to 300 meters
E.
RG6: Thicker, more robust, up to 600 meters
F.
3+1 wire: Combines three coaxial cables (video)
and one additional cable (power or data)
G.
Bandwidth: Up to 1 GHz
H.
Distance: Up to 300600 meters
I.
Use: Video transmission, power supply, and data
transmission
DVR (Digital Video Recorder):
1.
Analog DVR (4channel, 8channel, 16channel)
2.
DVR Records and stores video signals from
cameras
3.
Features: Motion detection, scheduling, and
remote access
4.
Video compression: H.264, MPEG4, or MJPEG
5.
Resolution: Up to 4CIF (704x576 pixels)
HDD (Hard Disk Drive):
1.
Stores recorded video footage from the DVR
2.
Capacity: Up to several terabytes
3.
Hard drive (500GB, 1TB, 2TB)
4.
Power supply
Monitors:
1.
Analog CCTV monitors (LED, LCD)
2.
Screen size (17", 19", 22")
3.
Displays live and recorded video from the DVR
4.
Resolution: Up to 1080p (1920x1080 pixels)
Connectors and Adapters:
BNC connector:
1.
Bayonet Neill Councilman connector
2.
Used to connect cameras to coaxial cables
DC connector:
1.
Used to connect power supplies to cameras and
other components
RCA cable (for audio):
2.
Connects the DVR to the monitor for audio output
Power adapters
Housing and Mounting:
3.
Camera housings (indoor, outdoor)
4.
Mounting brackets (wall, ceiling)
Power supply (SMPS):
1.
Input: 230V AC
2.
Output: 12V DC or 24V AC
3.
Power rating: Depends on the number of cameras
and other components
Power cord for DVR and monitor:
1.
Provides power to the DVR and monitor
Tools:
2.
Cable strippers
3.
Crimping tools
4.
Screwdrivers
5.
Drill bits
6.
Wire nuts or connectors
कृपया ध्यान दें कि एनालॉग सीसीटीवी प्रणालियों को धीरे-धीरे IP (Internet Protocol) Cameras और डिजिटल प्रणालियों द्वारा प्रतिस्थापित किया जा रहा है, जो उच्च रिज़ॉल्यूशन, आसान स्थापना और अधिक लचीलापन प्रदान करते हैं।
Note: आवश्यक विशिष्ट सामग्री सिस्टम डिज़ाइन, Cameras प्रकार और स्थापना आवश्यकताओं के आधार पर भिन्न हो सकती है।
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