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If you've landed here, you’re probably trying to wrangle more traffic down the same handful of wires — and you’re not alone. Concentrators and multiplexers are the unsung traffic directors of modern networks, bundling, splitting and smoothing data flows so everything from voice calls to sensor telemetry gets to where it needs to go. In the UK market there are specialist retailers, large distributors and general marketplaces all vying to be your go-to source. This guide walks you through the types, the buying checklist, and the best UK outlets to consider when you need to buy a reliable multiplexer or data concentrator.
In plain terms, a multiplexer (or “mux”) takes several input signals and combines them onto a single line so you can carry more data over the same physical connection. A concentrator does something similar but usually focuses on aggregating data from multiple endpoints into a central point for processing or transmission. Think of multiplexers as the highway lanes that merge traffic, and concentrators as the interchange towers that manage how cars get on and off the motorway.
Most multiplexers use time, frequency or statistical methods to keep multiple streams separate within the same channel. Time-division multiplexing assigns slices of time to each input, frequency-division separates streams by frequency, and statistical multiplexing dynamically allocates bandwidth based on demand. Concentrators often include protocol conversion, buffering, and sometimes local intelligence to filter or pre-process data before it hits your core.
Before you buy, get comfortable with terms like throughput (how much data can pass through per second), port density (how many devices you can attach), latency (delays introduced by processing), and rack size (how many inches of rack space a unit takes up). In many installations you’ll see devices that fit a standard 19-inch rack — that’s an industry staple and useful to always check.
Not all multiplexers are created equal. Picking the right class depends on whether you’re a telco, a data centre, a factory floor, or a small office trying to consolidate serial sensors. Here are the main categories and what they’re best for.
TDM devices are the classic telecom approach: each input gets a dedicated time slot. They’re robust, predictable and still widely used where guaranteed timing matters — for example in traditional voice or legacy telecom infrastructures. If you need low jitter and consistent slot allocation, this might be your best bet.
Statistical multiplexers are more dynamic: they redistribute bandwidth on the fly based on which links are active. Combined with data concentrators that can buffer and pre-process streams, this setup is ideal for sensor networks, remote monitoring and IoT aggregation where traffic is bursty and unpredictable.
When you’re scanning product pages and spec sheets, it helps to have a checklist. The following features will tell you whether a unit is a good fit or a future headache waiting to happen.
Throughput matters more than the number of ports in many scenarios. A device with twenty ports but limited aggregate capacity is like a multi-lane road that narrows down to a single lane — congestion guaranteed. Look at aggregate Mbps or Gbps figures, and whether those are shared or dedicated numbers.
Port count is important when space is tight. Many multiplexers are designed to fit a 19-inch rack and come in 1U, 2U or larger formats. If rack real estate is scarce, choose higher port density units that still fit into a 19-inch footprint. Also check weight if you’re mounting gear into a portable rack — units under 10 pounds are easier to handle and ship.
The UK has a healthy mix of specialist telecom distributors, large electronics component suppliers, and general marketplaces. Below are reputable options where professionals and hobbyists alike often start their search.
RS Components is a long-standing distributor that stocks a wide range of networking gear and industrial communication equipment. Their catalogue includes multiplexers from major manufacturers and many support resources like datasheets and technical articles. If you want a reliable source with next-day options for standard components, RS is a solid first stop.
Farnell, also known as element14, specializes in electronic components and networking hardware. They carry products aimed at both prototyping and full production, which makes them useful if you need a mix of small-batch testing gear and enterprise-grade units. Their search filters and community forums can help you match technical specs to real-world needs.
CDW focuses on IT solutions and is tailored to business purchases. You’ll find enterprise-grade multiplexers and concentrators here, often bundled with professional services or extended warranty options. If you’re buying for a medium-sized business or a corporate environment, CDW is worth comparing for pricing and support packages.
Comms Express is a specialist telecom retailer with a strong emphasis on VoIP and legacy telecom equipment. They supply gear used in PBX, ISDN and digital voice environments, and often stock accessories that make installation painless. Their catalogue is particularly useful if you’re integrating multiplexers into telecom racks or voice networks.
ProVu is a UK reseller focused on communications hardware, including VoIP gateways and concentration equipment. They’re known for helping customers map requirements to product families, which can be invaluable if you’re unsure what mix of ports and protocols you need. ProVu also works with installers and businesses that need tailored solutions.
Don’t dismiss Amazon for more niche telecom gear — the marketplace hosts both brand storefronts and third-party sellers offering new and refurbished units. Prices can be competitive and delivery is often fast. Just double-check manufacturer warranty terms and seller ratings before you click “buy.”
eBay is a go-to for older or discontinued multiplexers and concentrators. If you’re maintaining legacy equipment that’s no longer in production, eBay is a treasure trove. Expect mixed conditions and make sure you confirm functionality and return assurances from the seller to avoid surprises.
Arrow and Avnet are global distributors that serve the UK and are well suited for bulk purchases, OEM relationships and specialised telecom modules. If you’re buying at scale or need specific manufacturer partnerships, these distributors can offer supply chain support and access to end-of-life management services.
Buying a multiplexer is not just about the lowest sticker price. Compatibility, long-term support and how a unit fits into your network topology are all crucial considerations. Ask yourself whether you need manufacturer-level support, whether firmware updates are frequent, and whether spare modules are available in case of failure.
Low-cost units may save money upfront but could cost more in downtime and replacements. Consider the total cost of ownership: warranty duration, availability of spare parts, and the technical support options offered by the seller or distributor. For mission-critical links, spending a bit more on a product with a robust warranty often pays off in peace of mind.
Ensure the multiplexer supports the protocols and speeds used in your network. Does it handle legacy serial lines and modern Ethernet at the same time? Can it interoperate with existing switches and routers from vendors like Cisco or Juniper? Look for devices with clear protocol conversion capabilities if you’re bridging old and new technologies.
Hardware is only as good as the installation and support that surrounds it. Consider whether you’ll install the equipment yourself or hire a professional. Some UK suppliers offer installation services or partner recommendations — useful if you want a turnkey solution.
Good documentation is a lifesaver. You’ll want clear setup guides, configuration examples and firmware update procedures. Check the supplier’s website for downloads and whether they maintain an archive of older firmware — that can be useful when integrating older devices.
Ask whether the device supports SNMP, syslog or other monitoring protocols so you can plug it into your network management system. Devices that offer remote management via secure channels will reduce the need for on-site visits and speed up problem resolution.
Choosing where to buy is almost as important as choosing which device to buy. Here’s a quick checklist to evaluate UK suppliers:
- Product breadth: Do they stock the brands and models you’re considering? - Technical support: Can they answer configuration and interoperability questions? - Lead times: How long until your unit ships? - Warranty and spare parts: What’s the warranty period and are spares available? - Reviews and reputation: What do other UK buyers say about them?
Used equipment can be a cost-effective option for non-critical environments or for matching legacy hardware. However, refurbished units vary widely: some are factory refurbished with new components and warranty, others are sold “as-is.” If you buy used, prefer sellers who provide testing certificates and at least a short warranty. And if uptime matters, consider a new unit or a vendor-backed refurbished option.
Networks evolve. A smart purchase today is one that leaves room for tomorrow’s upgrades. Look for modular chassis that allow additional line cards, or devices that support software-defined features that can be enabled later. Choosing gear compatible with common standards makes expansions less painful and keeps your infrastructure flexible.
Buying concentrators and multiplexers in the UK involves balancing technical specs, supplier reliability and long-term support. Whether you’re outfitting a telecom exchange, aggregating sensors on an industrial floor, or keeping legacy voice circuits humming, the right vendor can simplify selection and installation. From specialist retailers like Comms Express and ProVu to broad distributors like RS Components, Farnell and Arrow, you’ve got options to suit different needs and budgets. Do the homework: check throughput, port density, rack fit (remember the 19-inch rack standard), and warranty terms to make sure your purchase delivers dependable performance for years to come.
