5G Router for CCTV: Upload, Remote Access and Data Planning

CCTV is one of the most common reasons businesses buy cellular routers. Construction sites, car parks, farms, solar farms, empty buildings, events, utilities and retail sites all need cameras in places without a fixed line. 5G has made this far easier, mainly because of its upload capacity. But CCTV over mobile still catches people out, usually for the same three reasons: upload bandwidth, remote access and data usage.

Upload is the number that matters

Almost everything about mobile broadband is marketed on download speed. CCTV is the opposite. Cameras send video out of the site, so the upload speed is what limits you.

Mobile upload is typically a fraction of download. A 5G router showing 300 Mbps down might manage 30 to 80 Mbps up, and much less in weak signal or at busy times. That is still a lot more than 4G, but it needs planning.

Bitrates vary with scene activity. A camera looking at trees blowing in the wind, or rain at night, can use far more than one looking at an empty car park. Allow headroom.

The three ways to set up CCTV over 5G

1. Local recording, remote viewing

Cameras record to a local NVR or to SD cards on site. Footage only crosses the 5G link when someone views live video or downloads a clip. This uses the least data and copes well with modest upload. It is the most common approach for remote sites.

2. Cloud recording

Cameras stream continuously to a cloud service. Nothing is lost if the site is vandalised, but upload and data use are high, because every camera is sending video all the time. Calculate the sustained upload needed and the monthly data before choosing this.

3. Event-based upload

Cameras or the NVR send clips only when motion or analytics trigger an event, often to a monitoring centre. This is common for monitored security systems and balances data use with off-site evidence.

Working out the data

For continuous upload, data use is easy to calculate and alarming to look at. One camera at 4 Mbps running all month uses roughly 1.3 terabytes. Four of them use over 5 terabytes. Even unlimited tariffs may not be intended for that, so check the fair use terms.

For local recording with remote viewing, data depends on how much people watch. An hour a day of live viewing on a sub-stream might use only a few gigabytes a month. Pulling full-quality clips uses more.

A sensible approach for most remote sites is to record locally at full quality, view remotely on sub-streams, and only pull main stream footage when you need evidence.

Remote access and CGNAT

This is where most CCTV over mobile projects first go wrong. Standard mobile SIMs give the router a private IP address behind carrier-grade NAT. The router cannot be reached from the internet, so port forwarding to the NVR does not work. The installer spends an afternoon trying, then calls someone.

There are four ways around it:

• Manufacturer P2P or cloud service. Most CCTV brands offer an app that connects outwards from the NVR to a cloud relay. It works through CGNAT and is the simplest option, but relies on the manufacturer’s service.
• Public or fixed IP SIM. The router gets a public address, so normal port forwarding or VPN access works. See public and static IP on 5G.
• VPN from the router. The router connects outwards to a VPN server or service, and you reach the site through that. See VPNs over 5G.
• Router remote access service. Many business router platforms include a way to reach devices behind the router through their cloud, without public IPs.

Choosing the router

For CCTV, look for:

• four external antenna connectors, because cabins and cabinets block signal
• good 5G upload capability and support for UK n78
• VPN support, ideally WireGuard and OpenVPN
• a firewall you can lock down properly
• wide DC input if running from batteries or solar
• remote management so you can check signal and reboot without a site visit
• an operating temperature range suited to an unheated cabin or enclosure

For outdoor deployments where the router sits on the camera mast, an outdoor 5G router powered over Ethernet avoids coax runs entirely.

Antennas for CCTV sites

CCTV towers and site cabins are often in poor signal spots. Mounting an antenna at the top of the camera mast can transform performance. Keep the router close to the antenna to minimise cable loss, or use an outdoor router at the top of the mast with a single Ethernet cable down. See the 5G antenna guide.

Power for remote CCTV

Mobile CCTV towers often run on batteries, solar or generators. The router is a significant part of the power budget. 5G routers typically draw more than 4G routers, especially under heavy upload. Check the router’s peak consumption and plan for winter, when solar output is lowest and cameras run infrared at night for longer.

4G or 5G for CCTV?

4G works for a couple of cameras with local recording and occasional remote viewing. 5G earns its place with more cameras, higher resolutions, cloud recording, or sites where people view live video regularly. Where 5G coverage is marginal, a good 4G router with a well-placed antenna can outperform a badly installed 5G one.

Security on a CCTV network

Keep cameras and the NVR on their own network segment, block their internet access except to services they genuinely need, change every default password, keep firmware updated, and access remotely through a VPN. The router’s firewall is the main defence, so configure it properly.

Keeping footage useful when the link is poor

Mobile links occasionally slow down or drop. Design the system so that does not matter for evidence. Recording locally means footage keeps building even when the link is down. Setting cameras to record main streams locally and send only low bitrate sub-streams remotely keeps live viewing usable in marginal coverage. Many NVRs can also buffer event clips and send them once the connection returns. The result is a system where a poor connection makes remote viewing slower but never loses the recording itself.

Testing a CCTV link

Before handing over the site, test upload speed from the router itself, at the time of day the site will be busiest. View all cameras remotely at once on sub-streams and check for buffering. Download a full quality clip and time it. Check that the router reconnects and the remote access path comes back after a power cycle, because remote sites lose power more often than anyone expects.

Worked example: a construction site

Take a typical construction site with eight cameras covering the perimeter, compound and site cabins. The client wants live viewing for the site manager, a monitoring centre to receive alarm clips at night, and footage kept for thirty days.

Recording all eight cameras continuously to the cloud would need around 30 Mbps of sustained upload and something like ten terabytes a month. That is unrealistic on most mobile tariffs and fragile in marginal coverage. A better design records everything locally on an NVR in the site cabin at full quality. The monitoring centre receives short event clips triggered by analytics. The site manager views live sub-streams on a phone app when needed. Monthly data drops to a few tens of gigabytes, and the system keeps recording even if the mobile link is interrupted.

The router sits in the cabin with a 4×4 antenna mounted on the cabin roof or on a short pole, using a short run of low loss cable. Remote access for the installer goes through a VPN, and the monitoring centre connects through its own approved method. Everything is on its own VLAN, separate from the site office network.

When the site has no mains power

Many remote camera deployments use self-contained towers with batteries and solar panels, sometimes backed by a small generator or fuel cell. In those setups every watt counts. Things that help:

• choose a router with low idle consumption and check its figures under load
• schedule non-urgent uploads for when power is plentiful
• use event-based recording and low bitrate sub-streams
• disable unused router features such as Wi-Fi
• monitor battery voltage through the router’s digital inputs or the tower’s controller

Checklist for 5G CCTV

1. Count cameras and decide resolution and codec.
2. Choose local, cloud or event-based recording.
3. Calculate upload needed and monthly data.
4. Pick the remote access method before choosing the SIM.
5. Survey signal where the antenna or outdoor router will go.
6. Choose a router with external antennas, VPN and suitable power input.
7. Lock down the firewall and change all default passwords.
8. Test remote viewing at busy times and after a power cycle.

For help with a CCTV connectivity project, email sales@5grouter.co.uk with camera numbers, location and how footage will be viewed.