Frequently Asked Questions

We install fingerprint attendance machines, face recognition systems, and access control devices for offices, schools, and factories.

EN: It depends on HDD size, camera quality, and number of cameras. Typically 7–30 days.
TA: HDD size, camera quality மற்றும் camera count அடிப்படையில் 7–30 நாட்கள் recording கிடைக்கும்.

EN: Yes, recording works without internet, but remote viewing needs internet.
TA: Internet இல்லாமலும் recording நடக்கும், ஆனால் mobile viewக்கு internet தேவை.

EN : NVRs use IP cameras to process video at the camera, offering higher resolution, better scalability, and smart analytics. DVRs process video at the recorder, typically using analog cameras and coax cables, making them more affordable for basic, short-range setups
TA : NVR-கள், வீடியோவை கேமராவிலேயே செயலாக்க IP கேமராக்களைப் பயன்படுத்துகின்றன. இதன் மூலம் அவை உயர் தெளிவுத்திறன், சிறந்த விரிவாக்கத் திறன் மற்றும் திறன்மிகு பகுப்பாய்வுகளை வழங்குகின்றன. DVR-கள், பொதுவாக அனலாக் கேமராக்கள் மற்றும் கோஆக்சியல் கேபிள்களைப் பயன்படுத்தி, ரெக்கார்டரிலேயே வீடியோவைச் செயலாக்குகின்றன. இதனால், அடிப்படை மற்றும் குறுகிய தூர அமைப்புகளுக்கு அவை மிகவும் மலிவானவையாக இருக்கின்றன.

EN: Higher MP gives better clarity. 2MP = basic, 5MP = clear, 8MP (4K) = very high detail.
TA: MP அதிகமாக இருந்தால் clarity அதிகம். 2MP basic, 5MP clear, 8MP ultra clear.

EN: Cameras use infrared (IR) LEDs to record in darkness. Some support full-color night vision.
TA: இருட்டிலும் படம் பதிவு செய்ய IR light பயன்படுத்தப்படும்.

Dome Cameras: Best for indoor/discreet use. Their shape makes it hard to see where the lens is pointing, and they are highly vandal-resistant.

Bullet Cameras: Best for outdoor/deterrence. They have a visible "arm" that points at a specific area, making them a great psychological deterrent for perimeters.

Use a Wide-Angle lens (typically 2.8mm) when you need to cover a large area with a single camera, such as a parking lot, lobby, or large retail floor. It provides excellent situational awareness but less detail at long distances.

Use a Zoom lens when you need to capture specific details from a distance, such as license plates at an entry gate or facial recognition at a cash counter.

Surveillance HDD (like Western Digital AllFrame or Seagate ImagePerfect) is recommended for 24/7 recording.

EN: Recording starts only when movement is detected, saving storage.
TA: movement இருக்கும் போது மட்டும் recording நடக்கும்.

EN: Yes, via USB, hard disk, or cloud backup.
TA: USB அல்லது cloud மூலம் backup எடுக்கலாம்.

Old footage gets automatically overwritten.

EN: Yes, multiple users can view with login credentials.
TA: ஆம், பல பயனர்கள் உள்நுழைவுச் சான்றுகளைக் கொண்டு பார்க்கலாம்.

EN: Possible reasons: no internet, wrong config, port issue.
TA: Internet இல்லாதது அல்லது setting problem ஆக இருக்கலாம்.

EN: Depends on area size, entry points, and security needs.
TA: உங்கள் இடத்தின் அளவு மற்றும் பாதுகாப்பு தேவைக்கு ஏற்ப.

EN: Power over Ethernet allows camera power + data through one cable.
TA: Power over Ethernet, கேமராவின் மின்சாரம் மற்றும் தரவு இரண்டையும் ஒரே கேபிள் மூலம் வழங்க அனுமதிக்கிறது.

EN: Only if UPS or inverter is installed.
TA: UPS or inverter இருந்தால் தான் power cut-ல் வேலை செய்யும்.

EN: Yes, you can receive instant alerts on mobile.
TA: motion நடந்தவுடன் mobile alert வரும்.

EN: Smart cameras detect humans, vehicles, and suspicious activity.
TA: மனிதர்கள், வாகனங்கள் போன்றவை detect செய்யும் smart camera.

EN: Yes, if not secured. Always use strong passwords & updates.
TA: பாதுகாப்பு இல்லாமல் இருந்தால் hack ஆகும். எப்போதும் வலிமையான கடவுச்சொற்களையும் புதுப்பிப்புகளையும் பயன்படுத்துங்கள்.

EN: Some cameras support audio recording.
TA: சில camera-களில் audio record செய்யலாம்.

EN: Cable issue, power issue, or camera fault.
TA : கேபிளில் சிக்கல், மின்சாரப் பிரச்சினை, அல்லது கேமராவில் கோளாறு.

EN: Lens dust, low resolution, or wrong settings.
TA: lens clean செய்ய வேண்டும் அல்லது setting change செய்ய வேண்டும்.

EN: HDD issue or recording settings disabled.
TA: HDD அல்லது setting problem.

EN: Depends on camera type, quantity, and wiring.
TA: camera count மற்றும் setup அடிப்படையில் cost மாறும்

CCTV installation cost depends on camera type, number of cameras, and wiring requirements. Basic setups start from ₹5,000 and can go higher based on features like night vision and remote access.

CCTV installation cost depends on camera type, number of cameras, and wiring requirements. Basic setups start from ₹5,000 and can go higher based on features like night vision and remote access.

Typically:

1. Small home → 2–4 cameras
2. Shop → 4–8 cameras
3. Office → 8+ cameras

Yes, Tech Defence Solutions provides CCTV installation services in Kanchipuram and nearby areas with fast on-site support.

If your camera image appears pink or purple, it is usually caused by a stuck IR (Infrared) cut filter. This filter switches between day mode (color) and night mode (infrared).

When the filter gets stuck, the camera cannot properly block infrared light during daytime
This results in a pink or washed-out image

Quick Fix:

Gently tap the camera body to try freeing the stuck IR filter

Permanent Solution:

If the issue keeps happening, the IR filter mechanism may be faulty and needs repair or replacement

The main difference between H.264 (AVC) and H.265 (HEVC) lies in their video compression efficiency. H.265 is a newer and more advanced codec that can compress video files up to 50% more efficiently than H.264 while maintaining the same or even better image quality. This means H.265 uses less storage space and requires lower bandwidth for streaming, making it ideal for CCTV systems with limited hard disk capacity or remote viewing over the internet. However, H.265 requires more processing power and may not be supported on older DVRs, NVRs, or mobile devices, whereas H.264 is widely compatible and more stable across all systems. Therefore, H.265 is generally recommended for modern setups, while H.264 is preferred when compatibility and performance on older hardware are a concern.

“No Signal” usually means the DVR/NVR is not receiving video from the camera.

Possible Causes:

1. Loose or damaged BNC/LAN cable
2. Camera not getting power
3. Wrong input channel selected
4. Faulty camera or port

Solution:

1. Check power supply and connections
2. Swap cables or ports to identify the issue
3. Test with another working camera

If night vision is not working, the IR LEDs or sensor may not be functioning.

Common Reasons:

1. IR LEDs are damaged
2. Camera not switching to night mode
3. Insufficient power supply

Fix:

1. Check if IR lights glow in darkness
2. Ensure proper power adapter
3. Replace camera if IR LEDs are faulty

Frequent disconnection is usually due to weak or unstable WiFi signal.

Causes:

1. Long distance from router
2. Network interference
3. Low-quality router

Solution:

1. Place camera closer to router
2. Use WiFi extender or mesh system
3. Upgrade router for better coverage

Recording issues are usually related to hard disk or settings.

Possible Reasons:

1. HDD not installed or faulty
2. Recording schedule disabled
3. Storage full

Fix:

1. Check HDD status in settings
2. Format or replace hard disk
3. Enable recording schedule

Recording issues are usually related to hard disk or settings.

Possible Reasons:

1. HDD not installed or faulty
2. Recording schedule disabled
3. Storage full

Fix:

1. Check HDD status in settings
2. Format or replace hard disk
3. Enable recording schedule

Remote viewing problems are usually due to network configuration issues.

Causes:

1. Internet not connected to DVR/NVR
2. Incorrect IP or P2P settings
3. Router blocking ports

Solution:

1. Check internet connection
2. Enable P2P/cloud service
3. Configure port forwarding correctly

Automatic restarting is mostly caused by power issues.

Reasons:

1. Faulty adapter
2. Voltage fluctuation
3. Overheating

Fix:

1. Replace power adapter
2. Use UPS/stabilizer
3. Ensure proper ventilation

Blurred images are caused by focus or lens issues.

Common Causes:
1. Dirty lens
2. Incorrect focus
3. Moisture inside lens

Solution:
1. Clean lens with soft cloth
2. Adjust focus manually
3. Replace camera if internal damage

No audio issue depends on camera support and settings.

Reasons:

1. Camera doesn’t support audio
2. Microphone disabled
3. Incorrect configuration

Fix:

1. Enable audio in settings
2.Check mic wiring
3. Use audio-supported camera

STQC (Standardisation Testing and Quality Certification) is an organization under the Standardisation Testing and Quality Certification Directorate, operating under the Ministry of Electronics and Information Technology. It provides testing, calibration, IT audits, certification, and quality assurance services for electronic and IT products.

An IR (Infrared) Camera is a surveillance camera equipped with infrared LEDs that allow it to capture images and video in low-light or complete darkness.

IR cameras use infrared LEDs to emit infrared light, which is invisible to the human eye. The camera sensor detects the reflected infrared light and produces a clear black-and-white image at night.

Smart IR automatically adjusts infrared LED brightness to prevent overexposure when objects are close to the camera.

EXIR is an advanced infrared technology that provides more uniform illumination and reduces overexposed spots.

A Full Color CCTV Camera is a surveillance camera that captures color video 24/7, including at night, using advanced image sensors and built-in warm LED lights.

Full Color and ColorVu are both technologies designed to provide color video surveillance at night, but there is an important distinction:

Full Color is a generic industry term used by many CCTV manufacturers for cameras that capture color images in low-light or nighttime conditions using large-aperture lenses, sensitive image sensors, and white LED illumination.

ColorVu is a proprietary technology developed by Hikvision. It is Hikvision's branded implementation of full-color night vision technology.

In very low light conditions, LED illumination is typically needed to maintain color images. Some premium models can produce color images with minimal ambient light.

Full Color cameras provide enhanced security by delivering detailed color footage day and night, making it easier to identify people, vehicles, and events accurately.

A Dual Light CCTV Camera is a security camera that combines Infrared (IR) LEDs and Warm White LEDs to provide intelligent night vision. It can switch between black-and-white IR mode and full-color mode automatically.

During normal nighttime conditions, the camera uses IR LEDs for discreet monitoring. When a person or vehicle is detected, the white LEDs turn on automatically, allowing the camera to record in full color.

Choosing the right camera depends on your security requirements, installation location, and budget. Each technology has its own strengths and limitations.

IR Camera

IR (Infrared) cameras use infrared LEDs to capture clear images in complete darkness. At night, the camera switches to black-and-white mode.

Advantages
1. Excellent visibility in complete darkness
2. Lower power consumption
3. Cost-effective solution
4. No visible light disturbance
5. Reliable 24/7 surveillance

Disadvantages
1. Night footage is only black and white
2. Difficult to identify clothing and vehicle colors
3. IR reflections can cause glare on nearby objects
4. Reduced detail compared to color footage

Full Color Camera

Full Color cameras use powerful image sensors and built-in warm LED lights to capture color video throughout the night.

Advantages
1. Full-color recording day and night
2. Easier identification of people and vehicles
3. Better facial and object recognition
4. High-quality evidence collection

Disadvantages
1. Requires white LED illumination at night
2. Higher power consumption
3. Continuous lighting may disturb neighbors
4. More visible to intruders
5. Generally more expensive than IR cameras

Dual Light Camera

Dual Light cameras combine infrared LEDs and white LEDs. They operate in IR mode during normal conditions and automatically switch to full-color mode when a person or vehicle is detected.

Advantages
1. Combines IR and Full Color technologies
2. Intelligent switching based on activity
3. Energy efficient compared to Full Color cameras
4. Provides color evidence when needed
5. Reduced light pollution during inactive periods
6. Better overall security performance

Disadvantages
1. Higher cost than standard IR cameras
2. White light activation may still attract attention
3. Requires proper configuration for optimal performance
4. Slightly more complex than traditional cameras



Which Camera Should You Choose?
1. IR Camera: Best for cost-effective, reliable night surveillance.
2. Full Color Camera: Best when color details are required all night.
3. Dual Light Camera: Best overall choice for modern security systems, providing intelligent switching, energy savings, and color evidence when activity is detected.

Two-Way Talk is a feature that allows users to listen and speak through a CCTV camera remotely using a mobile app, NVR, or monitoring software. The camera contains a built-in microphone and speaker, enabling real-time communication with people near the camera.


Advantages of Two-Way Talk Cameras

✅ Real-time communication from anywhere
✅ Improved security and deterrence
✅ Convenient visitor management
✅ Remote monitoring and assistance
✅ Better customer and employee interaction

Disadvantages of Two-Way Talk Cameras

❌ Requires internet connectivity for remote communication
❌ Audio quality may be affected by network speed
❌ Background noise can reduce voice clarity
❌ Built-in speakers are usually not as loud as dedicated PA systems
❌ Privacy considerations in areas where audio recording is regulated

1. Communicate with visitors remotely
2. Warn intruders or suspicious individuals
3. Provide instructions to delivery personnel
4. Monitor children, elderly family members, or staff
5. Improve security and customer interaction

For remote communication, the camera typically requires a network connection (Wi-Fi or wired internet). Local communication features depend on the camera system and software.

A refurbished hard disk is a drive that has been previously used, returned, repaired, or reconditioned and then tested for resale.

Advantages

✅ Lower purchase cost
✅ Suitable for temporary or budget projects
✅ Environmentally friendly (reused hardware)

Disadvantages

❌ Unknown previous usage history
❌ Higher risk of failure
❌ Shorter lifespan
❌ Limited warranty support
❌ Not ideal for continuous 24/7 CCTV recording

Best For
1. Budget CCTV systems
2. Non-critical data storage
3. Testing and temporary deployments

Premium Surveillance HDDs are purpose-built for security and surveillance systems. These drives are engineered to handle continuous recording, multiple high-definition video streams, and the demanding workload generated by modern CCTV systems.

Popular examples include:

1. Western Digital Purple Series
2. Seagate SkyHawk Series

Advantages of Premium Surveillance HDDs
1. Specifically designed for CCTV DVR and NVR applications.
2.Optimized for continuous 24/7 recording and playback.
3. Supports multiple camera channels simultaneously without performance degradation.
4. Better resistance to vibration and heat generated by long-term operation.
5. Lower risk of data loss and recording failures.
6. Enhanced firmware designed for surveillance workloads.
7. Longer operational life and improved reliability.
8. Extended warranty coverage compared to standard drives.

Disadvantages of Premium Surveillance HDDs
1. Higher initial purchase cost.
2. May be more expensive than necessary for very small surveillance systems.

Choose a Standard HDD if:
1. You have a limited budget.
2. The system has only a few cameras.
3. The footage is not considered mission-critical.
4. The installation is temporary or for basic monitoring.

Choose a Premium Surveillance HDD if:
1. You require dependable 24/7 recording.
2. The system includes multiple HD or 4K cameras.
3. Video evidence is important for security, legal, or operational purposes.
4. You want maximum reliability and longer storage device lifespan.

A Standard HDD is primarily designed for everyday computing tasks such as storing documents, photos, videos, software, and operating system files. These drives are commonly used in desktop computers and are not specifically engineered for continuous video recording applications.

Advantages of Standard HDDs
1. Lower purchase cost, making them suitable for budget-conscious installations.
2. Easily available from various brands and capacities.
3. Suitable for home users with a small number of cameras.
4. Adequate for light recording workloads.

Disadvantages of Standard HDDs
1. Not designed for continuous 24/7 operation.
2. Higher risk of wear and failure when used in DVRs and NVRs.
3. May experience performance issues when handling multiple camera streams simultaneously.
4. Increased chance of dropped frames or recording interruptions under heavy workloads.
5. Shorter lifespan in surveillance environments due to constant read/write activity.

Best Applications
1. Small home CCTV systems
2. Temporary surveillance setups
3. Installations with 2–4 cameras
4. Budget-focused projects

We install Analog HD, IP Network, 5MP, 2-Way Audio, and Color Night Vision cameras from brands like Hikvision, CP Plus, Dahua, and HiFocus.

A Two-Way Talk camera includes:

Microphone – Captures audio from the camera location.
Speaker – Plays your voice at the camera location.
Mobile App or Software – Allows users to communicate remotely via smartphone or computer.

When you press the talk button in the app, your voice is transmitted through the camera's speaker while you can simultaneously hear sounds from the camera's surroundings.

For a standard home, 2–4 cameras covering the main entrance, back door, and driveway is sufficient. Our team can do a free site visit and recommend the best setup.

Yes! All our DVR/NVR systems support remote viewing via mobile apps (like iVMS-4200, DMSS) on Android and iPhone.

We offer 2-year onsite service warranty on all CCTV installations. Camera and DVR products carry manufacturer warranty of 1–3 years.

A slow computer is usually caused by insufficient RAM, too many background programs, viruses, or a full hard drive. Over time, temporary files and unnecessary software can reduce system performance. To fix this, you can uninstall unused programs, clear temporary files, upgrade RAM, or switch from HDD to SSD for faster speed. Running a reliable antivirus scan can also help improve performance.

Automatic restarting is commonly due to overheating, faulty hardware, or power supply issues. It can also happen because of system errors or outdated drivers. Ensure your system has proper ventilation, clean dust from internal components, and check the power supply. Updating drivers and checking for system errors can also resolve the issue.

Slow internet on a computer can be due to network issues, outdated drivers, background downloads, or malware. Sometimes, the WiFi signal may be weak or interrupted. Restarting the router, updating network drivers, scanning for viruses, or using a wired connection can help improve internet speed.

If your computer is infected, it may show unusual behavior like pop-ups, slow performance, or unknown programs. You should immediately run a full antivirus scan using trusted software. Avoid downloading files from unknown sources and keep your system updated. In severe cases, formatting the system and reinstalling the OS may be necessary.

A hard disk may not be detected due to loose connections, damaged cables, or disk failure. It can also be a BIOS or driver issue. Check the cables, try connecting the disk to another system, and verify BIOS settings. If the disk is damaged, data recovery or replacement may be required.

If your computer is not turning on, the issue could be related to the power supply, motherboard, or internal components. Check the power cable, adapter, and SMPS. If there are no signs of power, the power supply unit may need replacement. For laptops, battery or charging issues could be the cause.

No sound issues are usually caused by disabled audio settings, missing drivers, or faulty speakers. Check the volume settings, ensure the correct output device is selected, and update or reinstall audio drivers. If the problem persists, test with external speakers or headphones.

The amount of RAM depends on your usage. For basic tasks like browsing and office work, 4GB to 8GB is sufficient. For multitasking, gaming, or editing, 16GB or more is recommended. Upgrading RAM improves performance, especially when running multiple applications.

You should upgrade to an SSD if your system is slow during boot or application loading. SSDs are much faster than traditional HDDs and significantly improve system performance. This upgrade is one of the most effective ways to speed up an old computer.

Yes, we service Dell, HP, Lenovo, Acer, Asus, Apple MacBook, and more. We handle hardware repairs, OS installation, virus removal, and upgrades.

Most repairs are completed same day or within 24 hours. Complex issues like motherboard repair may take 2–3 days.

Yes! We provide free onsite service within Kanchipuram for qualifying repairs. Call us to schedule a visit.

EN: We provide CCTV installation, computer/laptop sales & service, networking solutions, biometric systems, and web development.
TA: நாங்கள் CCTV installation, computer/laptop service, networking, biometric system மற்றும் web development சேவைகள் வழங்குகிறோம்

EN: Yes, we offer on-site service in Kanchipuram and nearby areas.
TA: ஆம், நாங்கள் காஞ்சிபுரம் மற்றும் அருகிலுள்ள பகுதிகளில் சேவை வழங்குகிறோம்.

EN: We support brands like CP PLUS, Hikvision, Dahua, TP-Link, Dell, HP, etc.
TA: CP PLUS, Hikvision, Dahua, TP-Link, Dell, HP போன்ற பிராண்டுகளை நாங்கள் support செய்கிறோம்.

Tech Defence Solutions delivers trusted CCTV, computer, and networking services with expert support, quality products, and fast on-site service — all at affordable prices.

We are based in Kanchipuram, Tamil Nadu. We also serve Walajabad, Uthiramerur, and surrounding areas. Call us at +91 88256 74741.

Yes! We offer affordable AMC plans for CCTV, computers, and biometric systems that include routine servicing and priority support.

Call or WhatsApp us at +91 88256 74741, or use our online combo price builder on the Offers page for instant CCTV combo pricing.