An NVR (Network Video Recorder) is a dedicated hardware device that records video streams from IP cameras, stores footage on internal or attached storage, and provides basic live view and playback functionality. NVRs are appropriate for single-site, smaller camera count installations (typically up to 32 or 64 cameras) where simplicity and cost are priorities. A VMS (Video Management System) is software — typically running on a server or rack of servers — that manages IP cameras, recording, storage, analytics, and system integrations at a scale and complexity that NVR hardware cannot match. VMS platforms such as Milestone XProtect, Genetec Security Centre, or Hikvision iVMS-5200 are designed for large-scale, multi-site, or high-integration environments where cameras must be coordinated with access control, fire alarm, PSIM, and other systems. Virtual Bridge advises on the appropriate platform during the initial consultation based on camera count, integration requirements, and operational objectives.

Camera resolution is specified in megapixels (MP) — the total number of pixels in the camera's sensor. Resolution selection depends on what the camera needs to deliver: facial recognition at distance requires higher resolution (4MP or 8MP) than a general overview camera monitoring a wide car park area (2MP may be sufficient). Virtual Bridge uses pixels-per-metre (PPM) calculations for each camera position — calculating the number of pixels that a target face or number plate will occupy in the camera's field of view at the monitoring distance. CCTV industry guidelines (CPNI in the UK, ONVIF specifications) define minimum PPM thresholds for different purposes: Detection (general presence of a person), Recognition (identification by a known observer), and Identification (evidential facial recognition). Virtual Bridge specifies camera resolution to meet the required purpose at each location, not simply to maximise megapixels or minimise cost across the entire system.

CCTV-access control integration typically involves three key functions. First, event-triggered camera display: when an access control event occurs (door forced, tailgating alarm, access denied on a specific card), the nearest camera to that door is automatically displayed on the operator's screen and begins event-triggered recording. Second, camera-assisted access decisions: in high-security applications, the operator can view the camera image of the door area before remotely releasing the door for a visitor or unrecognised badge. Third, combined audit trails: access control event logs and camera footage are linked so that a search for a specific badge transaction in the access control system automatically retrieves the corresponding camera footage from the same timestamp. Virtual Bridge delivers this integration in-house — the CCTV and access control teams are the same team, so the integration is designed, installed, and commissioned as one system rather than being retrofitted between two separately installed systems.

Virtual Bridge deploys video analytics as edge (on-camera), NVR-level, or server-based analytics depending on the platform and scale. The most commonly deployed analytics in GCC projects include: Perimeter Intrusion Detection — detecting a person or vehicle crossing a defined virtual line or entering a defined zone, generating an alarm for operator response; Loitering Detection — alerting when a person remains in a defined area beyond a configured time threshold; Face Detection — detecting and optionally matching faces against a watchlist (used in high-security access points and VIP recognition applications); Vehicle / ANPR — detecting vehicle presence and reading licence plates for access control or traffic management; People Counting — counting persons entering and leaving a zone for occupancy management or footfall reporting; and Abandoned Object Detection — alerting when an object is left unattended in a defined area. Analytics are configured with appropriate sensitivity thresholds during commissioning to minimise false alarms — an analytics system generating constant false alarms creates operator fatigue and reduces actual security value.

Storage requirement depends on five variables: number of cameras, video resolution (higher resolution = more data per frame), frame rate (frames per second — higher frame rate = more data), compression codec (H.265/HEVC requires approximately 50% less storage than H.264 for the same image quality), and retention period (how many days of footage must be stored). A typical calculation for a 30-day retention system using H.265 compression at 2MP resolution and 15fps per camera requires approximately 100–150 GB per camera per month. For a 32-camera system at these parameters, approximately 3–5TB of usable storage is required. Virtual Bridge performs a full storage calculation for every project — specifying the minimum required storage capacity and recommending RAID configurations to protect against disk failure. For enterprise systems, Virtual Bridge can design scalable SAN or NAS storage architectures to support growth without system replacement.

Yes. Virtual Bridge provides planned preventive maintenance (PPM) contracts for installed CCTV systems — including camera lens cleaning and focus check, camera housing integrity inspection, NVR/server health check, storage verification (confirming all cameras are recording to specification), hard disk S.M.A.R.T. status check, software and firmware update review, analytics rule verification, and system functional test. PPM frequencies are typically quarterly or biannual depending on the environment and system criticality. Reactive call-out support for camera or NVR faults, software licence renewal management, and system expansion support are also available across all Virtual Bridge operating territories.