Remote Site Connectivity – Satellite vs LTE vs Private LTE vs Radio

The RTU is wired, the solar panel is up and the pad is ready to produce. Then somebody asks the question that should have been settled at the design review: how does this site talk to the office? Pick wrong and you get stale data, missed alarms and truck rolls. Pick well and nobody thinks about remote site connectivity again for years. So which link fits your site: satellite, public LTE, private LTE or radio?

The right remote site connectivity choice depends on three things: how much data the site sends, where it sits, and how much downtime you can live with. Public LTE is usually cheapest wherever a carrier has solid coverage. SCADA radio is the owned, no-monthly-fee workhorse for low-bandwidth polling.

Satellite reaches anywhere with a view of the sky, and low-orbit services have cut the delay that made older geostationary links painful. Private LTE pays off when one operator has dozens or hundreds of sites in one area. Most well-run operations use two of these, one primary and one backup.

What Does a Remote Site Actually Need to Send?

Start with the traffic, not the technology. A typical pad, tank battery or remote monitoring site sends a few hundred tag values every few seconds, plus alarms. That is tiny. A single video camera, on the other hand, can send more data in a day than the SCADA system sends in a year.

The chart below uses simple assumptions to show the spread. It is a model, not a survey, but the math is easy to check.

Here is the arithmetic for the two ends of that chart:

• SCADA polling: 1 kilobyte per poll, every 10 seconds, is 8,640 polls per day. That is about 8.6 MB per day, or roughly 0.26 GB per month.
• Continuous camera: 2 megabits per second is 0.25 megabytes per second. Multiply by 86,400 seconds and you get 21.6 GB per day, or about 648 GB per month.

That gap drives almost every decision that follows. If the site only needs SCADA, nearly any link works. If someone wants live video, you have just ruled out narrowband radio and made metered satellite plans expensive.

How Does Each Remote Site Connectivity Option Work?

Each option moves bits a different way, and each has a different owner. That second point matters more than people expect, because whoever owns the network decides when it gets fixed.

Public Cellular LTE

A cellular router at the site connects to a carrier's tower, the same way a phone does. Hardware is cheap, setup takes an afternoon and bandwidth is plenty for SCADA and modest video. The catch is coverage. Rural coverage maps tend to be optimistic, and a site in a creek bottom can sit in a dead spot a mile from a tower.

A high-gain directional antenna on a short mast fixes many marginal sites, and a router with two SIM cards from different carriers can cover gaps in either one. You also live with the carrier's priorities, including outages and plan changes you do not control.

Licensed and Unlicensed Radio

Radio is the oldest SCADA link and still one of the best. Unlicensed radios in the 902 to 928 MHz band and licensed narrowband radios carry polling traffic from field sites back to a master radio at a tower or office. With tall towers and clear line of sight, a link can reach tens of miles.

You own the network, so there is no monthly fee per site, but you pay up front for radios, antennas, towers and a path study that checks terrain and clearance. Throughput is low, often measured in kilobits per second, which suits SCADA and not much else. Point-to-point microwave is the high-bandwidth cousin, used to backhaul a whole field to the office.

Satellite (GEO and LEO)

Geostationary (GEO) satellites sit about 35,786 km (22,236 miles) above the equator. A small dish called a VSAT (very small aperture terminal) works almost anywhere, but physics adds delay: one trip up and down takes roughly 240 to 280 ms, as the Satellite Signals latency explainer shows. Low Earth orbit (LEO) constellations fly a few hundred miles up, so the delay drops to tens of milliseconds and speeds are much higher.

LEO terminals draw far more power than a SCADA radio, which matters on a solar-powered site. GEO plans are often metered by the gigabyte, so they suit polling and alarms better than video. Both need a clear view of the sky, so trees, tanks and buildings on the wrong side of the dish can cause dropouts that look like network problems but are really site layout problems.

Private LTE

Private LTE uses the same cellular standard as a carrier network, but the operator (or a contractor) owns the towers, the radios and the core network. In the US, the CBRS band at 3.5 GHz opened this to industrial users. It works best when many sites sit inside a few towers' reach. Our guide to private LTE for industrial sites covers the spectrum, the hardware and the build in more detail.

Satellite vs LTE vs Private LTE vs Radio Side by Side

The table compresses the trade-offs. Treat the ranges as typical, not guaranteed, because terrain and plan details move every number.

Which Option Costs Less Over Time?

It depends on site count and time horizon. Cellular and satellite are mostly operating cost: modest hardware, then a monthly bill for every site, forever. Radio and private LTE are mostly capital cost: towers, radios, engineering and spectrum work up front, then a much smaller running cost.

A simple way to compare is a ten-year cost per site. Add the hardware, installation and engineering, then add 120 months of service fees, then divide by the number of sites. Do it for each option with real quotes. With five sites, a shared tower network rarely wins. With two hundred sites inside a twenty-mile radius, it often does, because the tower cost spreads thin and the monthly fees disappear.

Watch the costs that hide outside the quote:

• Tower leases, structural analysis and climbing crews.
• Path studies and, for licensed radio, frequency coordination and filing.
• Extra solar panels and batteries for power-hungry terminals.
• Truck rolls to reboot a hung modem two hours from town.

Why Should Every Critical Site Have a Backup Path?

Because every link fails sometimes, and they fail for different reasons. Cellular networks go down with tower power outages and backhaul cuts. Radio paths fade in certain weather or get blocked by new construction. Satellite links suffer during heavy rain (especially at higher frequencies) and when snow builds up on a dish.

The fix is diversity: two links that do not share a failure mode. A common pattern is cellular primary with satellite backup, or satellite primary with cellular failover. A dual-WAN router handles the switch automatically and can send only critical SCADA traffic over the backup to keep costs down. For sites that can shut themselves in safely, a single link may be fine. For a compressor station or a site with safety alarms, it rarely is.

A good rule from project reviews: if losing the link means someone has to drive out, price the drive. Two or three avoided truck rolls a year often pay for a backup path.

How Do You Pick? A Remote Site Connectivity Checklist

Run through these steps before you buy hardware. Most of them take a phone call or a site visit, not a consultant.

1. List the traffic. Tag count, poll rate, alarms, cameras, voice, remote access and software updates.
2. Set the downtime target. How long can the site go dark before it costs money or creates a safety issue?
3. Test coverage on the ground. Bring a signal meter or a test router to the actual equipment location, at equipment height.
4. Count the sites within reach of a shared tower. This decides whether owned networks pencil out.
5. Check the power budget. A solar site that runs a 10 W radio may need a bigger array for a LEO terminal or an LTE router plus camera.
6. Price ten years, not one. Include service fees, tower costs and expected truck rolls.
7. Pick a backup path with a different failure mode than the primary.
8. Plan security from day one. Every new link is a new way in, so use VPNs, firewalls and no default passwords.

Schedule-wise, cellular can be live in a day. Satellite takes a week or two to order and mount. Radio needs a path study and possibly licensing, so allow months. Private LTE is a real project, with design, spectrum, towers and SIM provisioning, and it slips like any construction job.

Matching the Link to the Load, Not the Brochure

Remote site connectivity is a matching problem. Size the traffic first, because SCADA alone barely needs a trickle while cameras need a pipe. Then look at location, ownership and how long the site can stay dark.

For a handful of scattered sites, cellular where it is strong and satellite where it is not is hard to beat. For a dense field you plan to run for decades, owned radio or private LTE usually wins on long-run cost and control. Whatever you choose, give the important sites a second path that fails differently.

Before anyone orders hardware, put the traffic for one typical site on a single page and get ten-year quotes for two options. Once those numbers sit side by side, the choice usually makes itself.

← All guides