For decades a surveillance system meant analog cameras wired with coaxial cable to a digital video recorder in a closet. That design still exists, mostly in buildings that have not been touched in years, but nobody designs a new system that way. Modern surveillance runs on the network, and understanding why makes every other decision about cameras easier.
Analog, briefly
An analog camera sends a video signal down a coaxial cable to a recorder, which digitizes and stores it. Resolution is limited, each camera needs its own cable back to the recorder plus separate power, and the picture cannot be analyzed for anything more than motion. Where analog cabling already exists, some hybrid recorders can reuse it, which is occasionally the pragmatic choice in an older building. Otherwise its day is over.
How IP cameras work
An IP camera is a small computer with a lens. It encodes video itself and sends it over a standard network cable, which also carries its power, to a network video recorder or to a cloud service. That one change explains most of the advantages:
- Resolution. 4K cameras are ordinary now, which means a single camera can cover a driveway or a lobby and still read a face or a plate on zoom.
- One cable. Power over Ethernet means no electrician at each camera location, and the same wiring plan as the rest of the building.
- Analytics. The camera or recorder can tell a person from a car from a deer, read license plates, and send an alert only when something worth seeing happens, which is the difference between a system you check and a system that ignores you.
- Remote viewing. Live and recorded video on a phone, a workstation, or the touch panel in the kitchen.
- Scale. Adding a camera is adding a network drop, whether the system has four cameras or four hundred.
Recorder on site or in the cloud
A network video recorder in the equipment rack keeps footage local, costs nothing per month, and keeps recording if the internet is down. Cloud-managed systems trade a subscription for simpler remote access, off-site storage, and software that is updated for you. Many businesses land on a hybrid: local recording with a cloud service for management and alerts. Retention, in days or weeks, is a decision to make early, because it drives the storage cost.
The part people skip: security of the cameras themselves
A camera is a network device, and a poorly installed one is the easiest way into a network. We keep cameras on their own network segment, disable any service that is not needed, use reputable manufacturers, such as Axis, that publish firmware updates, and never expose a recorder to the internet by opening router ports; remote access goes through the manufacturer's secure service or a VPN, as we explain in port forwarding vs. VPN. Firmware is kept current, and default passwords do not survive the installation.
Cameras as part of a larger system
In an integrated home or business, cameras are not a separate app. A gate camera appears on the touch panel when the intercom rings, the driveway camera pops onto the television when a car arrives at night, and a commercial system feeds a monitoring wall. Our gated community entrance and a security monitoring lab show two ends of that range, and the community gate project walks through one in detail.
If you are replacing an old analog system or starting from nothing, the right first step is a site walk to decide what each camera needs to see. Get in touch and we will plan it with you.