A construction site often needs a working network long before fixed broadband is available.
CCTV cameras may already be installed around the site. Engineers need Wi-Fi for laptops and tablets. PLCs, controllers, environmental sensors, access control systems, or temporary machinery may also need to send data back to a local server or remote control center.
This is not just a theoretical requirement. In a Reddit discussion about industrial networking equipment, one user pointed out a very practical construction-site need: “APs are required for cameras and engineers working on laptops”. Another comment highlighted DIN-rail mounting and easy remote management as valuable features for industrial networking equipment.
In this type of project, a 4G or 5G industrial router can become the temporary WAN gateway for the entire site.
The important part is not simply installing a SIM card and turning on Wi-Fi. A reliable construction-site network needs a clear topology, suitable bandwidth, proper device separation, stable power, and a backup plan.
Here is a practical way to build one.
Before choosing a router, list everything that needs to connect.
A typical temporary construction-site network may look like this:
At the same time:
Industrial Router → AP → Engineer Laptops / Tabletsand:
Industrial Router → Ethernet or Serial Port → PLC / ControllerThe industrial router acts as the WAN gateway. It provides Internet access through the cellular network and connects the different parts of the local site network.
For a small site, some Ethernet devices can connect directly to the router. For a larger site with several cameras, multiple APs, PLCs and computers, it is usually better to add an Ethernet or PoE switch rather than trying to connect every device directly to the router.
This also makes expansion easier as the construction project grows.
One common mistake is mounting the router inside a cabinet first and testing the cellular connection afterward.
Do the opposite.
Insert the SIM card and test 4G or 5G at the actual installation area before fixing the cabinet position.
Check several locations and antenna positions, especially if the router will eventually be installed inside a metal electrical cabinet.
For a construction site with CCTV, pay particular attention to **uplink performance**, not only download speed. Cameras are continuously sending video from the site toward a remote monitoring center or cloud platform, so a connection that feels fast when browsing a website may still perform poorly when several cameras upload at the same time.
If the site has many cameras, frequent video calls, remote desktop sessions, or other bandwidth-intensive services, 5G is usually the better starting point when reliable 5G coverage is available.
For simpler projects with a few devices and moderate traffic, a stable 4G connection can often be sufficient.
The goal is not to choose 5G simply because it is newer. The goal is to choose the connection that works reliably at the actual construction site.
For a site where cellular bandwidth is the main requirement, the USR-G816 5G industrial router is the more suitable option among the three models discussed here.
The G816 supports 5G SA/NSA networks as well as 4G fallback. It provides one Gigabit WAN port that can also be configured as LAN, three Gigabit LAN ports, dual SIM slots, dual-band Wi-Fi and an RS232/RS485 serial interface. PUSR also lists WAN failover and dual-SIM backup among its reliability functions.
That combination is useful on a construction site because several different types of equipment may need to share the same cellular connection.
For example:
The G816 also supports OpenVPN, IPsec, PPTP, L2TP and GRE, which means remote engineering access does not have to depend on exposing PLC or camera interfaces directly to the public Internet.
Its input range is DC 9–36 V, and PUSR specifies a metal enclosure, industrial EMC protection, a hardware watchdog and wide-temperature operation. The current product specifications list IP30 protection, so the router itself should still be installed inside a suitable protected cabinet rather than left directly exposed to rain or construction dust.
For sites using several CCTV streams together with engineer laptops and industrial equipment, this is generally the first model to consider.
Not every temporary site needs 5G.
If the site only has several PLCs, a small number of cameras, a local engineering computer and occasional remote maintenance, theUSR-G806wprovides a simpler 4G option.
The product supports 4G LTE, 2.4 GHz Wi-Fi, Ethernet connectivity and cellular, wired and Wi-Fi failover modes. PUSR's product information also lists wall and DIN-rail installation, DC 9–36 V input, remote management and VPN functions including OpenVPN, IPsec, PPTP, L2TP and GRE.
The product page lists configurable Ethernet arrangements such as 1 WAN + 2 LAN or 3 LAN, making it practical for small temporary networks where only a few wired devices need direct access.
The G806w supports remote monitoring, configuration, firmware upgrades and alarms through PUSR's management functions. It can also automatically fail over between cellular, wired and Wi-Fi WAN connections.
This becomes useful later in a construction project.
For example, the project may start without fixed broadband, so 4G is used as the main Internet connection. Several months later, an Ethernet broadband connection reaches the temporary site office. Instead of rebuilding the entire network, the wired connection can become the main WAN while cellular remains available as backup.
That is often more practical than treating the cellular router as disposable temporary equipment.
Sometimes the difficult part of the project is not cellular access. It is connecting a large number of local devices.
A larger construction site may have multiple CCTV zones, several APs, temporary offices, PLC cabinets and other Ethernet devices distributed across the project.
This is where the USR-G809s Gigabit Edge Routerbecomes more relevant.
The G809 series provides a high-density interface configuration with 2 SFP ports and 8 RJ45 Gigabit Ethernet ports, together with RS232/RS485, I/O, dual SIM, Wi-Fi 6 and other interfaces. The product page specifies Qualcomm Wi-Fi 6 AX3000-class wireless hardware, DC 9–60 V input and an operating temperature range of -40°C to +75°C.
Its Ethernet interface density means fewer additional network devices may be needed when several site systems need wired connections.
A practical arrangement could be:
Additional SFP interfaces are useful where different parts of the site network need to be interconnected over fiber.
The G809s also supports Wi-Fi 6 in AP, STA, relay and bridge modes, as well as VPN protocols including OpenVPN, IPsec, GRE, VXLAN and WireGuard. Its enclosure is specified as IP40 with DIN-rail installation support and a built-in watchdog.
For a site with many local Ethernet devices, this richer interface set can be more important than simply choosing the router with the fastest cellular modem.
A common temporary-network temptation is to put everything on Wi-Fi because it is quick.
That is convenient for laptops. It is not always the best choice for fixed CCTV cameras.
Where cabling is practical, connect fixed IP cameras to a PoE switch and connect the switch back to the router.
This gives you a cleaner topology:
Camera → PoE Switch → Industrial Router → 4G/5G
The PoE switch supplies power to compatible cameras while consolidating their network traffic onto one uplink.
Wi-Fi can then be kept mainly for mobile devices such as engineer laptops, tablets and phones.
This also makes troubleshooting easier. If a laptop loses Wi-Fi, it does not automatically mean the CCTV network has failed.
A PLC does not need the same network treatment as an engineer watching YouTube during lunch or several cameras continuously uploading video.
Whenever the equipment supports it, divide the site network into different subnets or VLANs.
A simple structure might be:
The G806w documentation, for example, lists VLAN, NAT, access control, filtering and firewall functions among its software features.
The purpose is not to make the construction network unnecessarily complicated. It is to stop unrelated traffic from becoming one large flat network.
If somebody plugs another laptop or temporary device into the site network, that device should not automatically have unrestricted access to every PLC.
Construction projects frequently need remote support.
A machine builder may need to inspect a PLC. A CCTV contractor may need access to the recorder. An engineer at headquarters may need to check equipment status.
Avoid solving this by exposing every device with separate public-facing ports.
PUSR's G816 and G806w both provide multiple VPN options, and the G809s also supports several VPN technologies.
A better design is:
Remote Engineer → Encrypted VPN → Site Router → PLC / NVR / Local Device
This creates one controlled entrance into the construction-site network rather than exposing individual industrial devices directly.
Network design often focuses on SIM cards and antennas while ignoring power.
On a construction site, power conditions may change as temporary distribution boxes are added, moved or disconnected.
Use a stable industrial DC power source appropriate for the selected router, provide proper grounding and surge protection, and check how the router behaves after a complete power interruption.
Industrial design helps, but it does not eliminate the need for a proper installation.
For example, the G816 is specified for DC 9–36 V input and uses a metal IP30 enclosure, while the G806w also supports DC 9–36 V and an IP30 metal enclosure. The G809s accepts DC 9–60 V and uses an IP40 aluminum-alloy enclosure.
None of those ratings means the router should simply be mounted outdoors in the rain.
Put the network equipment in an appropriate electrical or communications cabinet, and place cellular and Wi-Fi antennas where metal structures do not unnecessarily block the signal.
Temporary networks often become important very quickly.
At first the router may only serve two cameras and one engineer. A few weeks later, twenty devices may depend on it.
So configure backup connectivity during commissioning rather than after the first outage.
The G816 supports WAN failover and dual-SIM backup. The G806w supports automatic failover between mobile, wired and Wi-Fi WAN options.
For important sites, two SIM cards from suitable network operators can reduce dependence on a single cellular connection where the hardware configuration supports dual SIM.
If fixed broadband becomes available later, use it as another WAN path rather than removing cellular immediately.
The real requirement mentioned in the Reddit discussion was straightforward: a construction site needs networking for cameras and engineers using laptops.
Once industrial equipment is added, a practical architecture becomes:
4G/5G Base Station
↓
PUSR Industrial Router
↓
PoE Switch → CCTV Cameras
↓
AP → Engineer Laptops / Tablets
↓
LAN / RS232 / RS485 → PLC or Controller
For a small site with moderate traffic,USR-G806wcan provide the cellular gateway.
For a site with several cameras and heavier remote traffic,USR-G816 adds 5G bandwidth, Gigabit Ethernet, dual SIM and industrial serial connectivity.
For a larger local network where many Ethernet devices, APs or switches need to be connected,USR-G809sprovides considerably higher interface density with 8 RJ45 Gigabit ports, 2 SFP ports and Wi-Fi 6.
There is no single router that is automatically correct for every construction project.
Start by counting cameras, APs, PLCs and computers. Check the cellular signal at the actual installation point. Estimate how much traffic must leave the site, especially CCTV upload traffic. Then choose the router according to bandwidth, interface count and redundancy requirements.
That approach is much more reliable than choosing a router based only on whether the label says “4G” or “5G.”
Before handing the network over to the construction team, test it under realistic conditions.
Connect the cameras and confirm remote video viewing. Connect engineer laptops through the intended AP. Verify PLC communication. Disconnect the primary WAN and check whether the backup works as expected. Power-cycle the cabinet and confirm that the router, switch, AP and connected systems recover automatically.
Finally, confirm that remote maintenance works through the intended secure connection.
A temporary construction network does not need to be complicated.
But it should be designed as a small industrial network rather than as a large mobile hotspot.
If cellular WAN, local Ethernet, CCTV, Wi-Fi, PLC connectivity, power and backup are planned together from the beginning, a 4G/5G industrial router can provide a practical network during the months—or sometimes years—before permanent communications infrastructure is ready.
