Backup connectivity for alarm and cameras
NetCom Security Group
Internet in the countryside, at the lake or in the mountains, and a backup line for alarm and cameras: fibre, FWA, 4G/5G, satellite, dual line, auto failover.
This page is part of the section Networks, Wi-Fi and internet connectivity.
A house with an alarm and cameras needs two routes to the outside world: the main line and a backup line, cellular or satellite, that comes into play by itself when the first one stops. NetCom Security Group chooses the lines available at the location, including in the countryside, at the lake or in the mountains, and connects them to a gateway that switches from one to the other without anyone noticing.
The problem is simple: when the internet goes down, so does the link between the house and whoever has to respond. The alarm does not notify the monitoring centre, the cameras cannot be seen from the app, the home automation does not answer. In isolated houses it happens more often, because there is only one line and it is not always good. The solution is a second line, independent of the first, and a device that uses it by itself when needed.
Which internet to install in an isolated house
Where fibre optics reach, that is the main choice. Where they do not, there are three alternatives. Fixed wireless access (FWA) receives the signal from an operator's mast on a pole or an aerial on the roof: good bandwidth, dependent on line of sight to the transmitter. The 4G and 5G cellular network, with a SIM card in a unit with an external aerial: available almost everywhere, variable with local traffic. Satellite, with a small dish: it works even where there is nothing else, today with bandwidth and latency acceptable for cameras and home automation.
During the site visit we measure what really arrives at that spot, not on paper: the cellular signal on the roof, the line of sight to the transmitter, the space for the dish. From there comes the right combination: a main line and a backup line of a different technology, so that one fault does not stop them both.
How the dual line works
The house's gateway receives the two lines and monitors them continuously. As long as the main line works, everything goes through it; when it drops, within a few seconds the traffic switches to the backup, and returns by itself when the main line is active again. The owner receives an alert, but the cameras, the alarm and the home automation notice nothing. The two lines can also work together, sharing the traffic, when one alone is not enough.
The alarm control panel also has a backup of its own: a cellular module inside the panel, with a dedicated SIM card, that sends its signals even if the whole home network goes down. It is the rule we follow in every installation: see alarm systems.
How we design it
- Measurement on site. Cellular signal on the roof and in the house, line of sight to the transmitters, fibre and FWA coverage, space for aerials and dish.
- Choice of lines. One main and one backup line of a different technology; for isolated sites, two backups.
- Aerials and equipment. External aerial for cellular, FWA aerial or dish in a protected and discreet position, cables in a duct to the cabinet.
- Gateway with dual line. Automatic switch-over, alerts, combined use of the lines when needed: see home gateway and firewall.
- Failure test. At commissioning we disconnect the main line and check that the alarm, cameras and app keep working.
What it includes
Alarm without internet: what happens
A professional alarm system does not depend on the internet to work: the sensors, the siren and the control panel operate locally. The internet is needed to notify the monitoring centre and the owner. With the control panel's cellular backup and the gateway's dual line, the notification goes out anyway; and with the UPS everything stays on even without mains power, for the time planned in the design. Those with cameras in places without power or network can use cameras with a solar panel and a SIM card: see network for IP cameras and security systems.
Together with the other systems
The dual line protects the alarm systems, the video surveillance, the home automation and remote access to the home server and NAS. The status of the lines is shown in the cloud-managed network and the equipment sits in the cabinet of the structured cabling for the home. For owners far from the house, the page for owners living abroad; for faults that need a person, our 24/7 support.
Frequently asked questions
Does the alarm work without the internet?
Yes: the sensors, siren and control panel operate locally; the internet is needed to notify the monitoring centre and the owner. NetCom always adds a cellular module inside the control panel and, where needed, a second internet line on the gateway, so the notification goes out even if the main line drops.
Which internet is best in the countryside, at the lake or in the mountains?
Fibre where it reaches; otherwise fixed wireless access (FWA), the 4G or 5G cellular network with an external aerial, or satellite, chosen after a measurement on site. NetCom combines two different technologies, one main and one backup with a different operator, so that one fault does not stop them both.
How is an internet backup set up for the alarm and cameras?
With a gateway that receives two lines and switches from one to the other by itself within a few seconds, plus the cellular module inside the alarm control panel. NetCom tests the switch-over at commissioning, disconnecting the main line and checking that the alarm, cameras and app keep working.
Is satellite suitable for cameras and home automation?
Yes, today it is: bandwidth and latency are acceptable for viewing the cameras, receiving alerts and controlling the home automation. NetCom uses it as the main line where there is nothing else and as a backup in isolated houses, with the dish in a protected and discreet position.
How long does the backup last if the power fails?
It depends on the UPS chosen: NetCom sizes it to keep the gateway, line equipment, cameras and alarm running for the time agreed in the design, from a few hours to much longer on isolated sites, with the option of a generator where needed.
Does the backup SIM card have a monthly cost?
Yes, like any line: a modest fee, because the backup transmits little as long as the main line works. NetCom lists the fees of the recommended lines in the written proposal, separately from the cost of the installation, and helps you choose the operator with the best coverage at the location.
See also
Text by NetCom Security Group. Last updated: 31 October 2026.
Let's talk about your project
Tell us where the house or business is and what the network has to do: we will get back to you to arrange the site visit. You can also call +39 045 245 7879.
