Cader NetworksWhat actually breaks when the line drops
It's rarely just "no internet for a bit." A dropped line at a school can mean registration systems going offline, safeguarding and behaviour logs becoming unreachable, and VoIP phones going dead at exactly the moment a parent or an emergency call needs to get through. At a small council office or community site it's often the phones and the case-management system, both usually now cloud-hosted rather than run on local servers, so both go down together with the line.
The standard fix: automatic 4G failover
The most common, cost-effective backup is a 4G or 5G SIM sat in the router (or a small secondary router) that takes over automatically the instant the primary line drops, and switches back once it's restored, no one needs to notice or intervene. We build this into business broadband lines as standard, and it's usually the right first step before considering anything more elaborate.
When a single 4G SIM isn't enough
For a genuinely critical site, a rural GP-adjacent clinic, a site handling safeguarding calls, a small council hub that's the only point of contact for vulnerable residents nearby, a single mobile network as backup is still one point of failure if that network itself has an outage. Multi-network SIMs that aren't tied to one carrier close that gap, and for the most critical sites we'll sometimes recommend a second physical line entirely, an Ethernet or EFM leased line as the true primary, with 4G failover behind it.
Starlink as a genuine third option
Where a site sits in a mobile not-spot as well as being fibre-limited, which does happen at some rural Welsh schools and community halls, Starlink is increasingly the sensible backup precisely because it doesn't depend on the same infrastructure as either the fixed line or the mobile network. See our Starlink primary vs failover guide for how that decision usually plays out.
What to actually check for a school or public site
- Does the failover happen automatically, or does someone need to plug something in? Manual failover fails at 4am on a Sunday.
- Is the phone system (often VoIP now) covered by the same failover, or does it go down separately?
- Is there a genuine mobile not-spot at the site that would defeat a simple 4G backup?
- What's the realistic cost of an hour's outage, safeguarding risk, missed calls, staff time, versus the monthly cost of proper failover?
We work with schools, council sites and community buildings across mid and west Wales on exactly this. Tell us what's on site now and what genuinely can't go down, and we'll recommend the level of resilience that actually fits, not the most expensive option by default.