Physical Security
IP or analogue HD cameras: which system suits your business?
Analogue HD cameras are affordable and reuse existing coax, while IP cameras offer more detail, analytics and flexibility. Here is how to decide which system fits your site and how to migrate in stages.
Q-entra editorial teamPublished on 6 min read
Contents
Key takeaways
- For new installations, IP cameras are the better choice in most cases: higher resolution, analytics in the camera and one cable for video and power (PoE).
- Analogue HD systems (HD-TVI, AHD) mainly make sense where usable coax cabling exists and simple recording is enough.
- In analogue systems the recorder is the main security risk; in IP systems every camera is a network device that must be secured.
- Hybrid recorders and encoders allow a gradual migration without replacing all cameras at once.
- An upgrade usually pays off when the recorder no longer receives updates, the image is not good enough for identification or the building is being recabled anyway.
The short answer: IP or analogue?
For new video systems in offices, shops and businesses, IP cameras are usually the better choice. They capture more detail, analyse the image in the camera and receive data and power over one network cable. Analogue HD cameras still have their place where usable coax is already installed and simple, robust recording is enough.
The decision depends less on the technology than on your site: how old the cabling is, what the system should detect and how it will grow.
How analogue HD systems and IP cameras differ
Classic analogue cameras deliver roughly the picture quality of old PAL television. HD-over-coax technologies such as HD-TVI, AHD or HD-CVI carry much higher resolutions over the same coax, up to about 8 megapixels depending on the generation. The signal stays analogue, though: only the recorder (DVR) digitises, compresses and stores it.
An IP camera is a network device in its own right. It compresses the image itself, usually with H.264 or H.265, and streams it to a network video recorder (NVR) or video management software. The open ONVIF standard generally lets you combine cameras and recorders from different manufacturers, but check the details.
| Criterion | Analogue HD camera (HD-TVI, AHD) | IP camera |
|---|---|---|
| Resolution | Up to about 8 MP, depending on generation | Up to 4K and beyond, including multi-sensor |
| Analytics | Mostly in the recorder, fairly basic | In the camera, e.g. person and vehicle detection |
| Cabling and power | Coax plus a separate power supply | One network cable with PoE |
| Cable length | Often well over 100 m, depending on system | 100 m per link without extra devices |
| Expansion | Limited by the recorder's channels | Flexible via switches and licences |
| Attack surface | Mainly the recorder | Every camera is a network device |
Image quality and analytics compared
What matters is not the megapixel count but pixel density: how many pixels cover one metre of width where the person stands. The 2015 edition of the application standard EN 62676-4 gave around 250 pixels per metre for identifying a person and about a tenth of that for detecting one. The 2025 revision restructures the levels, but these figures remain a common rule of thumb. A higher-resolution camera therefore covers a larger area at the same pixel density, and the IP world offers a far wider choice of high-resolution models, lenses and multi-sensor cameras.
The bigger difference lies in analytics. Modern IP cameras analyse the image themselves: line crossing, zone monitoring and distinguishing people, vehicles and animals help reduce false alarms from shadows, rain or leaves. Some hybrid recorders offer similar functions for analogue cameras, limited by their processing power and the analogue signal quality. For number plate recognition, people counting or integration with access control, IP is hard to avoid.
Cabling and power: coax versus PoE
Besides the coax cable, analogue cameras need a separate power supply, usually 12 volts from a central unit or a local adapter. Some HD-over-coax systems also carry power over the coax (Power over Coax). The big advantage of coax is reach: depending on the system, runs well beyond 100 metres are possible.
IP cameras receive data and power over one network cable using Power over Ethernet (PoE). This simplifies installation and lets a central UPS protect all cameras. In return, the 100-metre limit per link applies and the switches must supply enough PoE power, as our article on PoE planning explains. Clean structured cabling with Cat 6A components is the solid foundation.
Cyber security: where the risks lie
An analogue camera is not on the network and cannot be attacked remotely via the coax. That does not make analogue systems secure. The recorder is a network device, often with app-based remote access, and older DVRs frequently no longer receive updates. In 2016 the Mirai botnet took over cameras and recorders with default passwords, among other devices.
With IP systems the attack surface grows, because every camera runs its own operating system with a web server. With a dedicated VLAN, unique passwords, firmware updates and a VPN instead of port forwarding, this is manageable. The key measures are summarised in our article on securing IP cameras.
Looking at costs over the whole lifetime
Compare systems over their planned service life, not just by the price per camera:
- Cabling: Existing coax saves effort. New network cabling is an investment that also serves Wi-Fi, telephony and access control.
- Installation and power: PoE removes the need for separate power supplies and power cables at the camera.
- Storage: Modern compression such as H.265 reduces storage needs, while higher resolutions increase them again.
- Licences: Video management software is often licensed per camera, whereas a simple NVR usually is not.
- Maintenance: IP cameras need regular firmware updates. Analogue cameras hardly do, but their recorder does.
- Spare parts: Check how long manufacturers will supply and update recorders and cameras.
On balance, analogue HD technology is often cheaper to buy when the cables are already in place. IP systems play to their strengths in expansion, integration and image quality. If the building is being recabled anyway, the price gap matters far less.
Migrating step by step with hybrid recorders
A move to IP need not happen all at once. Hybrid recorders record analogue HD and IP cameras simultaneously, video encoders convert analogue signals into IP streams if they support the cameras' format, and special adapters carry Ethernet, and in some cases PoE, over existing coax cables. This lets you plan the change in stages:
- Take stock: Document cameras, cable routes, recorders, retention periods and firmware versions.
- Set priorities: Start with entrances, tills, storerooms and driveways, where better image quality brings the most benefit.
- Replace the recorder: Install a hybrid recorder or video management software with encoders so that old and new cameras run on one interface.
- Prepare the network: Set up a dedicated camera VLAN, PoE switches and new cable runs where building work is happening anyway.
- Replace cameras gradually: Swap faulty or critical analogue cameras for IP models until the conversion is complete.
This spreads the investment over several budget years and avoids running two separate systems for long.
When an upgrade to IP pays off
- The recorder no longer receives security updates, or spare parts are hard to obtain.
- The image is not good enough to identify people or number plates.
- You need analytics, remote access across several sites or integration with access control and alarms.
- The building is being refurbished or recabled.
- The system needs to grow, and the recorder has no free channels left.
If none of these apply and the system runs reliably, a well-maintained analogue HD installation can serve for some years yet, provided the recorder is secured. If you need a sound basis for deciding, Q-entra can assess the existing installation and plan the right video surveillance with you, from the first camera swap to a complete IP solution.
