By the SightShield team · · 3 min read
The one-line answer
A DVR (digital video recorder) records HD analog cameras connected by coaxial cable. An NVR (network video recorder) records IP cameras connected over a network, usually with Cat6 cable. The recorder you need is decided by the type of cameras you choose.
SightShield installs NVR-based IP systems only. If you have an older DVR system, we can upgrade it to IP in one go or in stages.
Side by side
| DVR | NVR | |
|---|---|---|
| Cameras | HD analog (also called HD-TVI / AHD / CVI) | IP cameras |
| Cable | Coaxial plus a separate power cable | One Cat6 cable carries video and power (PoE) |
| Video processing | In the recorder | In the camera |
| Typical resolution | Up to 5MP, most often 2MP | 2MP to 8MP (4K) and above |
| Smart features | Basic; some newer DVRs add human/vehicle detection | Full analytics, audio, better night images |
| Distance | Coax runs long on one cable | 100 m per cable run; longer with switches or fibre |
| Cost | Lower for small systems | A little higher; gap has narrowed |
| Scaling | Limited by channel count | Easy to add cameras across buildings |
When a DVR is the right choice
- You already have coaxial cabling from an older system and want to upgrade cameras without re-wiring.
- A small home or shop with 4–8 cameras and a tight budget.
- You need basic recording and 2MP picture is enough.
When an NVR is the right choice
- New installations in offices, factories, apartments and villas.
- You want 4MP or higher resolution, better night images or audio.
- You need human/vehicle detection, line crossing or face recognition.
- Cameras spread across several buildings, linked by network switches or fibre.
- You expect to add cameras later.
Why new installations choose NVRs
- One cable per camera carries power and video, so installation is neater.
- Higher resolutions and smart detection are standard on IP cameras.
- Cameras can be added anywhere on the network, not just within DVR channel limits.
- IP camera models sold in India since April 2026 are certified for security.
- Systems scale across buildings with switches and fibre.
Hybrid recorders
Many DVRs now accept a few IP cameras as well (often sold as "hybrid" or "XVR"). That lets you keep existing analog cameras and add IP cameras where you need better detail, such as at the main gate. It is a sensible middle path when upgrading a large older system in stages.
Things that matter more than DVR vs NVR
Whichever you choose, the recorder should have enough channels for future cameras, a surveillance-grade hard disk sized for the number of days you want to keep, and a power backup so it keeps recording through power cuts. Those three decide whether footage is there when you need it.
CCTV installation in Bangalore →Choosing an NVR
| Spec | What to check |
|---|---|
| Channels | Current cameras plus room to grow |
| Incoming bandwidth | Enough for all cameras at full resolution |
| PoE ports | Built-in for small systems; external switches for larger ones |
| Disk bays | Enough capacity for your retention period |
| Analytics support | Handles the smart events your cameras generate |
| Outputs | HDMI for a monitor; alarm outputs if needed |
Quick answers
Can I connect IP cameras to a DVR?+
Only if the DVR is a hybrid model that supports IP channels, and usually only a few. A standard DVR records analog cameras only.
Is NVR picture quality better than DVR?+
Generally yes. IP cameras offer higher resolutions and process video in the camera, giving sharper images, especially at night and at higher megapixels.
Do I need internet for an NVR or DVR?+
No. Both record locally to a hard disk. Internet is only needed to watch cameras on your phone or get alerts.
Can you replace my old DVR system with an NVR?+
Yes. We survey the existing cameras and cable routes, then quote IP cameras, a PoE NVR and network cabling, reusing conduits wherever possible. Large systems can be moved over in stages, starting with the gate and entry points.
Can an NVR record cameras from another brand?+
Often, through ONVIF, though some smart features work fully only with the same brand.
How many cameras can one NVR handle?+
NVRs come in 4, 8, 16, 32 and more channels; large sites use several NVRs or video management software.