Why warehouses are hard
An empty warehouse is easy to cover. Fill it with steel racking, pallets of tinned food or liquids and the signal behaves very differently. Water and metal absorb and reflect Wi-Fi, so coverage that looked fine at handover can collapse when the racks fill up for the busy season. Seasonal stock levels mean the same building can have very different Wi-Fi in March and November.
High ceilings add another problem. An access point mounted twelve metres up spreads its signal over the top of the racking, but very little reaches down the aisles where scanners are used. Devices see a network, try to use it and fail, which looks like random drop-outs. The devices then cling to a weak connection because they can still hear the access point, even though they cannot send data back reliably.
Design for the devices you actually use
Handheld scanners, vehicle-mounted terminals and label printers often have smaller antennas and older wireless chips than laptops. They may only use 2.4 GHz, roam poorly between access points and give up on weak signals faster. Check what your devices support before designing the network around them. Some older terminals also only support older security settings, which may need a separate network so the rest of the warehouse can use modern encryption.
Warehouse management software also tends to be sensitive to brief drops. A scanner that loses connection mid-transaction can create duplicate picks or lost records. Roaming settings, signal thresholds and timeouts need tuning so devices hand over between access points cleanly as staff move up and down aisles. Ask your software vendor what network behaviour their devices expect; they often publish recommended settings.
Placement and antennas
Mounting access points lower, often at the ends of aisles or on the racking uprights at a safe height, puts signal where people work. Directional antennas can push coverage down long aisles instead of spraying it in every direction. Outdoor-rated or dust-resistant units suit loading docks, yards and cold stores.
Mounting points need to be agreed with whoever manages the racking and forklift traffic, so nothing gets clipped by a load. Cable routes should follow cable trays or the building structure, protected where forklifts operate. Every unit should be cabled back to a switch and powered through PoE. Any work involving power to new locations is for a registered electrician; the data cabling and PoE side is low-voltage work.
Long distances and outbuildings
Standard copper data cable is limited to around 100 metres per run. In a large building, that means either a second comms cabinet partway across the floor or fibre links between cabinets. Fibre handles long distances, is immune to electrical interference from machinery and is the normal choice between buildings on the same site.
Where trenching is not practical, a point-to-point wireless bridge between buildings can carry the network across a yard. These are directional links aimed precisely at each other and are very different from ordinary Wi-Fi. They need a clear line of sight and secure mounting. They are also useful for a temporary site office during construction or an expansion.
Mixed office and warehouse spaces
Most sites combine an office, a warehouse floor and a dispatch area. Treat them as separate zones with different needs. The office wants capacity for video calls and laptops. The warehouse wants coverage and reliable roaming for scanners. Dispatch may need both, plus wired connections for label printers and courier terminals.
A single managed system across all zones keeps it simple, with separate networks for staff laptops, warehouse devices and guests. Putting scanners on their own segment also stops a problem in one area from affecting the others. It also lets you set different roaming and power settings for each zone, tuned to the devices and work in that space, while still managing everything from one dashboard.
Survey, test and revisit
Large buildings are where an onsite survey earns its keep. Measure coverage with the racking full, test with the actual scanners, and walk the aisles while watching roaming. Recheck after major layout changes, because moving racking can create new dead spots overnight. Include the yard and loading docks if staff use devices outside, and check coverage in freezers or chillers separately.
Keep a plan showing every access point, its mounting height and the cable route back to the cabinet. When a unit fails or a forklift clips one, that plan gets a replacement in the right spot quickly. Note the model and the switch port too, so replacing a damaged unit is a quick swap rather than a hunt along the cable tray to work out where it connects.
In short
- Design coverage with the racking full, not empty.
- Mount access points where people work, often lower down the aisles.
- Check what scanners and terminals support before choosing settings.
- Use fibre or extra cabinets for runs beyond about 100 metres.
- Resurvey after racking changes.