Knowledge Center

Security Guides, How-Tos
& Expert Insights

Practical knowledge on CCTV, access control, fire safety, biometrics, AI monitoring and more — written by Pujaso's certified security engineers to help you make better decisions.

Articles & Guides

Latest from the Knowledge Center

Practical, expert-written resources to help you plan, buy, install and manage your security systems.

CCTV
CCTV

IP Camera vs Analogue Camera — Which is Right for Your Business?

A side-by-side comparison of IP and analogue CCTV systems covering image quality, cabling, cost, scalability and the best use cases for each technology.

CCTV
CCTV

How to Calculate CCTV Storage: NVR Hard Drive Sizing Guide

Step-by-step formula to calculate how much storage you need based on camera count, resolution, frames per second and retention period requirements.

Access Control
Access Control

Access Control 101: Cards, Biometrics or Mobile — What to Choose?

A beginner's guide to access control technology — comparing RFID cards, fingerprint readers, face recognition and mobile credentials for different environments.

Fire Safety
Fire Safety

Addressable vs Conventional Fire Alarm — Which System Does Your Building Need?

Understand the technical and practical differences between addressable and conventional fire alarm systems and how to match the right system to your building size and use.

Fire Safety
Fire Safety

How to Get a Fire NOC in Delhi: Step-by-Step Process for Buildings

A complete walkthrough of the fire NOC application process in Delhi — required documents, inspection checklist, common reasons for rejection and how to avoid them.

Biometrics
Biometrics

Fingerprint vs Face Recognition Attendance — Pros, Cons & When to Use Each

A practical comparison of fingerprint and face recognition attendance systems — accuracy, hygiene, speed, cost and the right choice for different workplace environments.

Intrusion
Intrusion

How to Choose an Intrusion Detection System for Your Office or Warehouse

Motion detectors, door/window sensors, glass-break detection and alarm panels — how each component works and how to design the right intrusion detection layout for your site.

AI & Monitoring
AI & AutoSense

What is AI-Powered CCTV? How Machine Learning is Transforming Surveillance

From object detection and facial recognition to behavioural analytics and predictive alerts — how AI is changing CCTV from a passive recorder to an active intelligence system.

Buying Guide
Buying Guide

10 Questions to Ask Before Hiring a Security Systems Company in India

Not all security installers are equal. Here are the 10 most important questions to ask any security systems vendor before signing a contract — to protect your investment and avoid costly mistakes.

CCTV Maintenance
CCTV

Why Your CCTV Cameras May Be Recording Nothing — And How to Find Out

Camera offline faults, HDD failures and full storage are the three most common silent failures in CCTV systems. Learn how to detect them early and prevent footage loss.

Key Management
Access Control

Electronic Key Management Systems: Why Every Large Facility Needs One

Uncontrolled key management is a serious security vulnerability. Learn how electronic key cabinets track every key movement and create a complete audit trail for compliance.

AMC Guide
Buying Guide

AMC vs No-AMC: The Real Cost of Not Having a Maintenance Contract for Security Systems

A data-driven look at what unplanned security system failures really cost — versus the predictable, lower cost of a well-structured Annual Maintenance Contract.

Guides & Downloads

Free Resources

Downloadable checklists, specification sheets and planning guides — free for you to use.

Checklist

CCTV System Pre-Installation Site Survey Checklist

Download PDF
Tool

CCTV Storage Calculator — How Much HDD Do You Need?

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Checklist

Fire Alarm Annual Maintenance & Testing Checklist

Download PDF
Guide

What to Include in a Security Systems AMC Contract — Buyer's Guide

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Spec Sheet

Access Control Technology Comparison: Card vs Biometric vs Mobile

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Planning Guide

Security Systems Planning Guide for New Office Buildings

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Checklist

Monthly CCTV Health Check — 12-Point Inspection Checklist

Download PDF
Whitepaper

AI-Driven Security Monitoring: How AutoSense™ Works — Technical Overview

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FAQs

Frequently Asked Questions

Quick answers to the most common questions we get from customers across India.

How many CCTV cameras do I need for my office?

The number of cameras depends on the size of your premises, the number of entry/exit points, blind spots and your coverage objectives. As a general rule, a small office of 1,000 sq ft typically needs 4–6 cameras. Larger premises require a proper site survey — Pujaso offers free surveys to assess your specific requirements and recommend the optimal camera placement.

What is the difference between DVR and NVR?

A DVR (Digital Video Recorder) works with analogue cameras and processes video at the recorder. An NVR (Network Video Recorder) works with IP cameras — each camera processes its own video and sends it over a network to the NVR for storage. NVR systems generally offer higher resolution, better scalability and easier remote access, making them the preferred choice for new installations.

How long does CCTV footage get stored?

Retention period depends on the hard drive capacity in your NVR/DVR and the recording settings (resolution, frame rate, number of cameras). Most installations are configured for 30 days of continuous recording. Higher resolution or more cameras requires larger storage. Pujaso can calculate the exact storage requirement for your setup during the site survey.

Can I view my CCTV cameras on my mobile phone?

Yes. All modern IP camera systems and NVRs support remote viewing via mobile apps on both Android and iOS. During installation, Pujaso configures the remote access settings and sets up the mobile app on your phone — so you can view live and recorded footage from anywhere with an internet connection.

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