Keep the network running through a short power cut

Decide what staying connected means

A short outage can interrupt a client call even when your laptop still has battery. A small uninterruptible power supply, or UPS, can keep local networking equipment powered. It cannot guarantee internet service: your provider's infrastructure and the connection to your premises also need to remain available. AT&T's outage guidance makes that wider-network dependency clear.

Choose a concrete goal before shopping: ride through momentary interruptions, finish an important call, or provide enough time to move to a separate connection. Avoid translating an advertised runtime into a business guarantee. A contingency plan should still explain what to do if the broadband service itself fails.

Follow the complete equipment path

List the powered devices between the incoming connection and your work device. Depending on the installation, that may include a modem or fiber terminal, router, Ethernet switch, and a separate Wi-Fi access point. Check the provider's documentation if you cannot identify a box. Backing up only the router is insufficient when another necessary device loses power.

Keep the list limited to equipment needed for that goal. Printers, spare displays and unrelated accessories should not quietly become part of the network runtime budget. If different boxes sit in different rooms, resolve their safe outlet locations before choosing one centrally placed UPS. Do not plan an improvised chain of extension leads.

Compare runtime at your actual load

Use documented equipment requirements and the UPS manufacturer's sizing guidance to choose adequate output capacity. Then compare the manufacturer's runtime information at the combined load, rather than ranking units by VA alone. Battery energy and output capacity answer different questions: whether the UPS can support the load, and how long it can do so.

For basic networking in an otherwise stable supply, Eaton identifies standby UPS designs as a suitable option. Its guidance favors line-interactive models where voltage fluctuations are common. Also check how many outlets actually receive battery power, whether bulky adapters fit without blocking adjacent sockets, and the unit's placement and ventilation requirements.

Plan the maintenance before installation

A UPS is a maintained device. APC explains that load, temperature, battery age and discharge history affect runtime and battery life. Check replacement-battery availability and the exact model's service instructions rather than assuming a battery lasts indefinitely. Keep the installation date and support information with your office equipment records.

After charging and setup, use the manufacturer's prescribed self-test and verification procedure at a convenient time. Confirm that every essential box is on a battery-backed outlet and that the network returns to normal after a test. Do not open mains-powered equipment or improvise battery packs. Have a qualified electrician address questionable outlets or recurring electrical faults. Treat a cellular hotspot or other backup connection as a separate continuity decision, since a UPS only supplies power.

Source check

Official sources checked October 1, 2026. Runtime must be verified for the exact UPS, battery condition and connected equipment.