If you work on CCTV upgrades, takeovers, or awkward retrofit jobs, there is a good chance you have come across CAT5 transmission and baluns as a possible shortcut. On the right site, they can be a very practical fix. On the wrong site, they can leave you with wasted labour, repeat visits, and a customer who feels like they paid twice.

That is why it helps to look at baluns for what they really are. They are not magic. They are not always the cheap answer. And they are definitely not a substitute for good system design.

At a basic level, a balun lets you send CCTV video over twisted pair cabling instead of standard coax. In older analogue and HD-over-coax environments, that can be useful when a building already has usable structured cable in place, or when re-cabling in coax would be messy, slow, or expensive. 

FVS itself offers dedicated CAT5 transmission, HD baluns, and a wider range of CCTV accessories and Camera & NVR accessories aimed at exactly these kinds of real-world installation decisions. 

What baluns are actually good at

Baluns come into their own when you are dealing with legacy or hybrid systems and the cable route is the main headache, not the camera or recorder choice.

For example, you might have an older commercial site with twisted pair already installed between key points. Pulling fresh coax could mean opening finished walls, working around occupied areas, or adding time that pushes the job outside the customer’s budget. In that situation, using baluns can help you re-use the existing route and get the system live without turning a simple refresh into a full building works project.

They also make sense when you are maintaining or extending an existing HD-over-coax setup rather than moving the whole site onto IP CCTV or a full HD hybrid platform straight away. If the customer needs a sensible interim fix, a balun-based approach can buy time and control cost. 

FVS’ catalogue reflects that split between traditional, hybrid, and IP options, with categories for IP CCTV cameras, IP CCTV NVRs, and HD hybrid equipment alongside transmission accessories. 

Where they save you money

The biggest saving is usually labour, not product cost.

A pair of baluns may look cheap on paper, but the real benefit is avoiding the time and disruption of pulling replacement cable. If you can use an existing CAT5 run that is in decent condition, correctly terminated, and sensibly routed away from major interference sources, you may reduce installation time and keep the price acceptable for the customer.

That can be especially helpful on smaller retail units, offices, workshops, or schools where the customer wants to improve coverage without paying for a full rip-out. If the choice is between a workable transmission solution now or no upgrade at all, baluns can absolutely earn their place.

Where they become a false economy

This is the part installers already know in their gut. Cheap transmission fixes stop being cheap when they create faults.

If the cable is poor quality, badly joined, run through noisy electrical areas, water-damaged, or simply too old to trust, a balun will not rescue it. It will only help you discover the problem after you have already committed time on site. Then the “saving” disappears into fault-finding, extra visits, and awkward conversations about why the picture is unstable or why the night image falls apart.

The same applies when the customer expects the performance of a modern IP system but the infrastructure decision belongs to a much older standard. If the brief calls for better image detail, easier remote management, stronger future expansion, and cleaner integration with other security devices, forcing the job through baluns may hold the whole system back. 

FVS’ recent trade-focused articles repeatedly stress that cable choice, power planning, and accessory decisions affect long-term reliability, call-outs, and quoting accuracy. 

The cable question matters more than the balun

One of the easiest mistakes on site is treating all CAT5 the same. It is not.

The condition of the run, the termination quality, the route, the joints, and the real distance all matter. For structured copper cabling, the standard reference point most installers know is a 100 metre maximum channel, typically made up of 90 metres of fixed cable and up to 10 metres of patching. Once you start pushing beyond sensible limits, performance becomes much less predictable.

That does not mean every CCTV balun job fails at long distance. It means you should stop guessing. Test the run. Check the route. Check the joints. Check the terminations. If the site is already marginal, adding a low-cost transmission workaround may simply bury a bigger infrastructure problem.

Passive vs active thinking

In simple terms, passive solutions are often attractive because they are cheap and straightforward. But straightforward is only good when the rest of the job is straightforward too.

If you are working with short, clean, known-good runs on a system that does not need to do anything clever, passive baluns can be perfectly fine. If the run is long, noisy, or temperamental, or if you need stronger performance margins, the “cheapest” choice can quickly become the most expensive one overall.

That is where your judgement matters more than the parts list. A good installer does not just ask, “Can I make this work?” You also ask, “Will this still be working properly in 12 months without eating into my margin?”

When you should stop and move to IP instead

Sometimes the best answer is not a better balun. It is a different architecture.

If the customer is already looking at scalability, remote access, analytics, deterrence, or integration, it may make more sense to move them toward a properly specified IP system using IP CCTV cameras, IP CCTV NVRs, and the right switching and network planning. FVS’ recent blogs put a lot of emphasis on PoE budgeting, headroom, recorder planning, and choosing accessories that reduce failures later on. That is a strong clue about where the market is heading.

The same goes if the customer is moving toward layered security. If you are already discussing active deterrence cameras, access control, or specialist coverage using IP PTZ speed domes, then bolting a patchwork transmission fix onto the job may not be the smartest long-term route.

A practical rule of thumb

Baluns are usually the right fix when you are re-using good existing cable, solving a defined transmission problem, and keeping a sensible legacy or hybrid system commercially viable.

They are usually a false economy when you are using them to avoid admitting the cabling is poor, the spec is outdated, or the site really needs a cleaner move to modern infrastructure.

In other words, use baluns to solve a cable-route problem. Do not use them to disguise a system-design problem.

FAQs

Are CAT5 baluns still worth using in 2026?

Yes, in the right setting. They are still useful on retrofit jobs, hybrid upgrades, and sites where existing twisted pair cabling is in good condition. They are less attractive when the customer is already expecting the flexibility and long-term expansion of a modern IP setup. FVS continues to stock CAT5 transmission and balun products, which shows there is still a real trade use case for them. 

Are baluns cheaper than re-cabling?

Sometimes, but only at first glance. The product cost can be low, and you may save labour if the installed cable is good. But if the run is poor and you end up fault-finding, re-terminating, or revisiting site, the low upfront price can turn into a much higher real cost.

What is the biggest mistake installers make with CAT5 transmission?

The biggest mistake is assuming the cable is the easy part. In reality, the existing run is often the whole story. If you do not test it properly, you can spend hours blaming the camera, the recorder, or the balun when the real issue is the cable route or termination quality.

Should you choose baluns or move straight to IP?

That depends on the job. If it is a contained upgrade and the cable is sound, baluns may be the sensible answer. If the customer wants better scalability, cleaner integration, and a more future-ready platform, it is often better to move them toward IP CCTV, supported by the right cameras, recorders, and accessories. 

Final thought

If you want to protect your margin, reduce call-backs, and give customers a system that makes sense beyond handover day, do not pick baluns just because they are there. Pick them when the site, the cable, and the system objective all line up.

If you want help choosing the right transmission method, legacy upgrade path, or product mix for your next job, speak to FVS CCTV and build the system properly from the start.