What is an Analog Camera (CCTV)? Definition + when to upgrade to IP

What is an Analog Camera (CCTV)?

An analog camera, often called a CCTV camera, sends a continuous video signal over a 75-ohm coaxial cable to a DVR or analog matrix. Legacy analog tops out at 960H resolution (about 700 horizontal lines). HD-over-coax formats (HD-TVI, HD-CVI, AHD) extended that to 4K on the same coax cable, released starting around 2014. Analog cameras need separate low-voltage power; they don't use PoE. The format persists in installs that reuse legacy coax.

The short definition

An analog camera captures light at its image sensor and pushes an unencoded baseband video signal down a 75-ohm coaxial cable terminated in a BNC connector. No on-camera compression, no IP address. A DVR or analog matrix digitizes the signal and writes it to disk. Power runs separately, typically 12V DC or 24V AC, on its own 18-gauge bell-wire pair.

That two-wire architecture defined install economics for two decades: coax for video, low-voltage for power, both pulled at install. The DVR records up to 8 or 16 channels per box.

From 960H to 4K HD-over-coax

Legacy analog tops out at 960H, roughly 700 horizontal lines (between standard definition and a 720p screenshot). Starting around 2014, three competing HD-over-coax standards extended analog to HD and then 4K on the same coaxial cable.

HD-TVI. Hanwha Techwin / Hikvision. Up to 8MP (4K) on current generation. Most common in commercial.
HD-CVI. Dahua. Up to 8MP. Note: Dahua products are excluded from NDAA-compliant installs per Section 889.
AHD. NextChip. Up to 5MP on current generation.

Hybrid DVRs auto-detect which format each camera uses and adapt. That's what makes mixed-camera retrofits work: a building with 12 legacy 960H cameras and 4 new HD-TVI 4MP cameras records all 16 to the same DVR.

Analog vs IP: when each wins

The decision comes down to existing wiring and feature requirements.

Analog wins when: coax is already pulled and tested, the budget is tight, the install is one site, no analytics or audio are needed, and the lease is short (under 3 years).
IP wins when: wiring needs replacement anyway, you need 4K with audio or analytics, you have multi-site federation requirements, you want PoE-powered cameras, or you need integration with access control or alarm systems.

See the IP camera entry for the counterpart and the DVR entry for the recording side.

Where analog still shows up

Tenant-improvement upgrades on a short lease. 18 months of life left in the space, existing coax in the ceilings. HD-TVI cameras and a hybrid DVR lift picture quality without re-pulling cable.
Older retail and quick-service restaurant chains. Stores built before 2010 with coax already run. Replacing one store's hardware costs less than a full Cat6 retrofit per location.
Industrial outbuildings with long conduit runs. A camera 200 meters out where Cat6 would need fiber and a remote PoE injector. HD-over-coax carries the signal cleanly on RG6, no networking required.

When to ask Tec-Tel about analog vs IP

We'll walk the building, test the existing coax for HD compatibility, and tell you whether to keep analog for another lifecycle, run a hybrid migration, or commit to a full IP rebuild.

Frequent buyer questions

Is CCTV the same as an analog camera?

Functionally, yes, in most current usage. CCTV (Closed-Circuit Television) originally meant any camera system whose signal didn't broadcast publicly, including IP. In current industry usage, 'CCTV camera' typically means an analog or HD-over-coax camera that records to a DVR. IP cameras are usually called 'IP cameras' or 'network cameras' instead.

Can analog cameras be 4K?

Yes, on HD-over-coax formats (HD-TVI and HD-CVI both support 4K, 8MP). The constraint is the cable: clean RG59 or RG6 coax under 100 meters can pass 4K. Older copper-clad-aluminum cable or runs over 100 meters often degrade the signal. Test before buying. If the coax doesn't pass 4K, IP over Cat6 is the better path.

Why are analog cameras still used?

Two reasons. First, existing wiring: a 1990s or 2000s install has coax and power runs already pulled. Replacing them costs more than upgrading the cameras and DVR. Second, simplicity: a small business with eight cameras, one location, and no remote-access needs gets a working system from analog plus a DVR for less than IP plus a switch plus an NVR.

Can I mix analog and IP cameras?

Yes, on a hybrid DVR. Most current commercial DVRs record both formats. A typical 16-channel hybrid handles 16 analog or 8 analog plus 8 IP. That's the standard migration path: keep working analog cameras, add IP cameras as the analog ones fail or as new coverage is needed.

What's the picture-quality difference between 4K analog and 4K IP?

On a static, well-lit scene at the same megapixel count, the picture is similar. The IP camera wins on low light (better noise reduction in modern image-signal-processors), audio support, smart motion analytics, and any feature that needs back-end metadata. The analog camera wins on simplicity and on-site retention without networking.

Start with a free consultation.

Tell us what you're protecting and what's already in place. The Tec-Tel team reviews it and comes back with a written plan.

Tell us how many sites you run and what's already in place. We'll show you what a build or upgrade looks like.

Straight answers from the team that does the work. We're platform-agnostic, so you get the system that fits your sites, not one brand's catalog.

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