A backup connection for your card terminal
Most card terminal failures are not card terminal failures. They are connection failures wearing a terminal's clothes, and the fix lives in the network rather than in the machine. A store that replaces a working terminal because it "keeps going down" has bought an expensive piece of hardware to solve a problem the hardware never had.
The diagnosis is usually simple and the remedy usually cheap, which is a rare combination in payments.
How do you tell a connection problem from a terminal problem?
Look at what else on the counter is suffering. If the point-of-sale software is slow, the scale is dropping off, or the back-office computer is complaining at the same times of day, the terminal is a symptom rather than a cause.
A second test takes a minute: put the terminal on a phone's mobile hotspot and run a small transaction. If it sails through, the machine is fine and your internet is not. That single test has saved a great many stores an unnecessary equipment call.
What are the realistic backup options?
Three, in rough order of cost. A terminal with a built-in cellular radio, which switches to mobile data when the wired path fails and needs no thinking during an outage. A second broadband line from a different provider, which helps only if the two providers do not share the same physical path to your building. And a mobile hotspot kept in the drawer, which is the cheapest and depends on somebody remembering it exists.
The first is usually right for a single-counter store. Cellular fallback is not exotic any more, and a terminal that fails over automatically is worth more than one that fails over when a human notices.
Does a backup path change what a sale costs?
Not in interchange terms. A transaction over cellular is the same transaction as one over broadband; the network does not price the last mile. What changes is your carrier bill, and on a device sending small authorization messages the data volume is trivial.
Anyone quoting you a per-transaction surcharge for cellular is quoting you their own pricing, not a network cost.
What else goes down with the internet?
More than the terminal, and it is worth mapping before it happens. Your scale, your lottery machine, your money-transfer terminal, your loyalty lookup, your surveillance recorder's remote view, and often your phone if it is voice-over-internet. A store that plans only for card payments during an outage discovers the rest of the list one item at a time, with a line waiting.
Write the list and mark which items have their own path. Anything with a cellular radio survives independently; anything on the same router does not.
What should the counter do when the line drops?
Have a printed page taped inside a cabinet door with four items: how to switch the terminal to its backup path, the offline transaction cap, the internet provider's number and account reference, and what to tell customers. Two minutes of writing now replaces twenty minutes of improvisation later.
The line about what to tell customers matters more than it sounds. "Our internet is down, cards under twenty dollars are working" keeps a queue moving. Silence empties a store.
Add one more line to that page: who on your crew is allowed to make the call to stop taking cards entirely. During a long outage somebody has to decide, and a store where three people each assume another is deciding will keep taking sales it should have stopped taking an hour earlier.
Frequently asked questions
Is a cellular terminal enough on its own, without broadband?
For a small counter, often yes. Authorization traffic is tiny and a cellular-only setup removes a whole category of failure. The usual reason to keep broadband is that the rest of the counter needs it, not that the terminal does.
Will a backup connection help during a power cut?
Only if something is keeping the terminal and its radio alive. A small uninterruptible power supply on the counter buys enough runtime to finish the transaction in progress and close out properly, which is usually the useful goal rather than trading through a blackout.
Do two internet providers really give me two paths?
Sometimes, and it is worth asking directly. If both services arrive on the same physical cable into the building, a backhoe takes out both at once. Two technologies — a wired line and a cellular radio — are more genuinely independent than two wired providers.
How do I know the fallback actually works?
Test it deliberately. Unplug the network cable on a slow morning and run a one-dollar transaction. A fallback nobody has ever exercised is a plan, not a backup, and the day it matters is the worst day to find out which one you have.
Does the terminal store anything sensitive while offline?
Terminals are built to keep card data encrypted and to limit what is retained, which is part of what the PCI Security Standards Council certification programme covers. That is a reason to use a current, supported terminal rather than an old one kept alive past its support window.
Is it worth buying new equipment just for this?
If your connection fails often enough that you have a routine for it, the answer is usually yes, and the cost is smaller than the lost sales. Ask what your current equipment supports first, since some terminals already have a radio that was never activated.