By the SightShield team · · 3 min read
Scale changes the design
A system for a house or shop is one NVR, one switch and a few cables. A campus — a factory with several sheds, a college with hostels, a hospital, a gated community with many towers — may have 100 to 1,000 cameras spread over many buildings hundreds of metres apart. Copper cable alone cannot reach, one NVR cannot hold everything, and one guard cannot watch it all. The design has to deal with distance, storage, viewing and resilience together.
Fibre backbone
Copper Ethernet is limited to about 100 metres. Between buildings, fibre optic cable carries video over hundreds of metres or kilometres without loss and is immune to lightning-induced surges. Each building gets a network rack with a PoE switch for its cameras, and fibre links connect the racks to the core switch and recording location. Running spare fibre cores costs little and saves digging later.
Cat6 vs Cat6A vs fibre →Where to record
| Approach | How it works | Pros | Cons |
|---|---|---|---|
| Distributed NVRs | An NVR in each building records local cameras | If the backbone fails, recording continues; less traffic on fibre | More devices to manage |
| Central recording | All cameras record to NVRs or servers in a central room | Easier management and security | Backbone failure loses recording from that building |
| Hybrid | Local recording plus central copies of key cameras | Resilient and central | More storage and cost |
Control room and VMS
With hundreds of cameras, a VMS brings all NVRs into one interface with site maps, alarm handling and user permissions. A control room with a video wall and operator workstations lets a small team monitor the whole campus, with alarm pop-ups from perimeter analytics, access control and fire alarms.
Video management software (VMS) →Power and resilience
- UPS in every network rack, sized for switches and cameras, plus generator backup for the control room.
- Surge protection on outdoor camera runs and at each building entry.
- Redundant fibre paths for critical buildings.
- RAID storage and spare disks for central recorders.
- Health monitoring that alerts when a camera, disk or link fails.
Planning in phases
- Phase 1: perimeter, gates and main entrances — the highest-risk points.
- Phase 2: building entrances, lobbies, stores and parking.
- Phase 3: internal corridors, labs, production areas and analytics.
- Size the fibre backbone, core switches and VMS licences for the final phase from the start.
Network and security
Keep CCTV on its own VLAN or physically separate network, with firewall rules controlling access from office networks. Use unique passwords, role-based VMS accounts and logs of who viewed and exported footage. For colleges and hospitals, data protection policies should cover CCTV.
Separate network for CCTV →Example: a 40-acre factory campus
A plant near Hosur Road with six production sheds, stores, an admin block and a long boundary wall has 220 cameras. Each shed has a rack with PoE switches and a 64-channel NVR; a 12-core fibre ring connects the racks to the security building. A VMS in the security building shows all cameras on a six-screen video wall, perimeter cameras run line-crossing analytics at night, and the HR and production heads have restricted-view logins. If a fibre link is cut, each shed keeps recording locally.
Designing your campus system
We survey large sites, design the fibre and recording architecture, and install in phases without disrupting operations.
CCTV for factories and campuses →Quick answers
Why is fibre used for campus CCTV?+
It carries video over long distances between buildings without loss and is immune to lightning-induced surges.
Should we record centrally or in each building?+
Distributed recording is more resilient; central is easier to manage. Many campuses use a hybrid.
Do we need a VMS?+
For hundreds of cameras across buildings, yes — it brings all recorders into one interface.
How do we expand later?+
Plan the backbone, core switches and VMS licences for the final size and add cameras in phases.
How many people are needed to monitor a campus?+
With good analytics and alarm pop-ups, a small team can monitor hundreds of cameras.