Camera coverage and placement
Coverage design starts from the events the system needs to detect — perimeter intrusion, vehicle access, loading-bay activity, internal high-value zones — and works backward to camera placement, lens choice and resolution.
Camera quantity alone is a poor design proxy. A small number of well-placed analytics-capable cameras consistently outperforms many fixed cameras with no analytic layer.
NVR vs VMS
Smaller sites typically run on a fixed NVR — adequate for recording and simple retrieval. Larger or multi-site operations benefit from a video management system (VMS) that scales, integrates with other systems and supports analytics workflows.
- NVR — single site, simple retrieval, limited integration
- VMS — multi-site, role-based access, analytics & integrations
- Cloud / hybrid — managed retention and remote operations
Network and storage design
Surveillance traffic is sustained, high-bandwidth and time-sensitive. It should run on a segregated network with bandwidth and storage planned for retention and analytics needs — not bolted on to corporate IT.
Integration with detection and access
Integrated surveillance auto-presents the relevant camera on intruder, access or PIDS events. This is the design that allows a small operations team to act on detection events without searching for the right view.
Retention and data protection
Footage retention should be set by lawful purpose — not by what the storage can hold. Documented retention periods, restricted access and audit logging are the baseline expected by regulators in both UK and US jurisdictions.
Frequently asked questions
Is cloud surveillance the right choice for a commercial site?
Cloud or hybrid models suit multi-site operations and sites where the operational team isn't on premises. Fully on-premise still makes sense where bandwidth is constrained or where regulatory rules require it.
What resolution should commercial cameras be?
Resolution should follow the detection purpose. A camera intended for facial identification has different requirements from one used for overview — pixel-density targets (typically expressed as pixels per metre) are the right specification basis.
How long should footage be retained?
Retention should match the lawful purpose: commonly 30 days for general commercial surveillance, longer where there is a specific operational or regulatory case. Indefinite retention is rarely defensible.
What resolution is right for evidential identification?
Evidential identification typically requires around two hundred and fifty pixels per metre on target — meaning a face fills a meaningful proportion of the frame. This is a demanding specification that governs lens choice, camera placement and typical spacing. Most sites use identification-grade cameras selectively at chokepoints, and overview-grade cameras elsewhere for context.
How is footage protected from tampering?
Modern VMS platforms sign recorded footage cryptographically and log all access, providing an audit trail that supports evidential use in court. Physical storage is protected through access control, network segmentation and role-based permissions. Cloud storage adds an off-site immutability layer that meaningfully reduces the risk of tampering by anyone with physical access to the recording hardware.
Can surveillance systems be centrally managed across sites?
Yes — enterprise VMS platforms are designed for multi-site management, with a single operator interface handling many sites, role-based permissions and consolidated event handling. This is the default architecture for retail chains, logistics operators and multi-branch operations, and delivers materially better security outcomes than a collection of independently managed single-site NVRs.
How should camera health be monitored?
A VMS with proactive camera health monitoring reports offline cameras, degraded image quality, storage errors and network path issues in real time. Without this, cameras fail silently and are commonly discovered offline only when footage is needed after an incident — the worst possible moment. Active health monitoring is a design essential, not an optional feature.
Continue in the intruder detection hub
The intruder detection hub sets out how this technology fits alongside the other layers of a complete commercial design.
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