For most businesses, a primary connection plus one good backup is enough. For a hospital, an emergency operations center or a critical utility site, an outage is not an inconvenience. It affects safety. Those sites need a design where no single failure, and ideally no single type of failure, can take them offline.
The principle: different technologies, different paths
Redundancy only works when the layers fail for different reasons. Two fiber circuits in the same trench share one risk. Fiber, coax and wireless share almost none. The goal is to stack connections that do not depend on the same cable, the same building entry, the same provider or the same weather.
A typical three-layer design
- Primary: fiber. High capacity for everyday traffic, often with more than one circuit.
- Backup: coax. A wired path on a separate route and separate infrastructure.
- Tertiary: wireless. Fixed wireless and low-earth-orbit satellite, independent of anything in the ground.
Engineering it as one network
Stacking circuits is not the same as designing a network. Multi-carrier SD-WAN ties the layers together, measures the health of each link and steers traffic automatically, so clinical systems, records and communications keep running when one layer degrades. The design also has to cover rooftop work, building entry, power and how each layer is monitored.
A major regional hospital system serving about 4 million people runs three layers: 10G fiber, 1G coax, and a wireless layer of fixed wireless plus Starlink, engineered and installed end to end by SimpleCom. Read Three layers of redundancy for a hospital that cannot go dark.
Where to start
- Map every existing circuit, its route and its building entry.
- Identify which systems must stay up and what they need.
- Add layers on technologies the site does not already depend on.
- Test failure scenarios on purpose and document the results.
Common questions
Is a third layer worth the cost?
For sites where an outage affects safety or carries a large cost per hour, an independent third layer is often the cheapest insurance available.
Does satellite make sense as a tertiary layer?
Yes. It does not depend on local fiber, coax or cell towers, which makes it a strong independent path.
Running a site that cannot go dark?
One team to survey, install and support every site, on your timeline.