Networking

Mesh kit, repeater or a better router for the room upstairs:

all three promise to fix the dead bedroom, and they are not interchangeable. The router sets the Wi-Fi generation of the whole network: dual-band Wi-Fi 6 is the sensible floor, and Wi-Fi 7 only pays off once your phones and laptops support it. A repeater is the cheap fix, but it listens and talks on the same radio, so the room it rescues gets roughly half the speed. A mesh kit such as TP-Link Deco or ASUS ZenWiFi spreads matching units under one network name. Concrete block and a slab floor swallow signal, so the second unit belongs on the stairs or, better still, wired back to the first.

Switches and ceiling access points in a small office:

once several computers, a printer and a camera recorder share one line, cable beats Wi-Fi. An unmanaged gigabit switch simply adds ports; a managed one lets an installer keep cameras, staff and guests apart; a PoE switch powers ceiling access points such as TP-Link Omada or Ubiquiti UniFi through the data cable itself. Shared files can live on a network drive from storage and hard drives, and a tower from desktops with no Wi-Fi card is better served by a cable from the switch than by a USB adapter.

Outdoor antennas and satellite dishes where the fibre stops:

away from the larger towns it stops early, and in a village near Flores in Petén the network is often a pair of Ubiquiti NanoStation or LiteBeam antennas aimed at each other to carry a connection from one building to the next, or a Starlink dish on the roof. Sun-cracked plastic, green corrosion under the connector cover and a nearby lightning strike are how outdoor kit usually dies, so open the cover and ask about storms. Many older Ubiquiti units run on passive power over Ethernet and fail on the wrong injector, which makes the original one part of the sale. A used Starlink dish only activates for you once the seller has transferred it out of their account.

The provider’s box on the wall and what your own router fetches:

the first one is not yours to sell. The modem or fibre box a provider installs usually belongs to the provider and goes back when the service ends, so a listing for one is a box someone will be asked to return. Keep it, ask the technician to put it in bridge mode, and run your own router behind it. That router loses value mainly by Wi-Fi generation: a two-unit Wi-Fi 6 mesh kit is around Q1,300 to Q1,500 new, while a Wi-Fi 5 pair still sells new for about Q600 to Q700, which puts a hard ceiling on any used Wi-Fi 5 kit however clean it looks.

Firmware support on a second-hand router:

is what the hardware version on its label tells you. That version decides which firmware the unit takes and whether the maker still issues security updates, and a router dropped from updates is cheap for a reason. Before paying, hold the reset button and log in to its settings. Mesh units stay tied to the owner’s app account until removed, so each should arrive released and reset. On a switch, plug a laptop into every port and check each one links at gigabit. Cheap rolls sold as Cat 6 are often copper-clad aluminium: scrape a conductor and silver shows under the copper colour, and that cable runs hot under PoE and snaps at the connector.

A router photographed label-side up:

saves a round of messages, because the model, hardware version and Wi-Fi standard are all printed there. Say how many units a mesh kit has and include the power adapters and any PoE injector. Factory-reset everything, remove mesh units from your app account and state plainly that the equipment is yours, not the provider’s. A buyer coming from Mixco will want to know whether it works with their fibre; any router does, since it sits behind the provider’s box, so have it powered up when they arrive and let them watch its network appear on their phone.