12 Years Later: How to Get the Most Out of Your DAS
Last week, I was onsite servicing a Distributed Antenna System that Stiehl Communications installed portions of more than 12 years ago.
Twelve years is a long time in the cellular world. Phones have changed. Carrier networks have changed. Frequencies and technologies have changed. The demands we place on wireless networks have changed dramatically.
But the DAS is still there, doing its job.
We tested the system during our service visit, and it continues to perform well and meet its key performance indicators (KPIs), just as it was designed to do more than a decade ago.
That's pretty awesome for a 12-year-old piece of telecommunications infrastructure.
It also raises a useful question: Why do some DAS installations continue performing for years while others develop problems much sooner?
In our experience, longevity usually comes back to three things:
- Engineering
- Installation
- Maintenance
1. It Starts With a Well-Engineered DAS
The best opportunity to extend the life of a DAS happens before the first piece of equipment is installed.
A DAS needs to be engineered around the building it serves. That means understanding the building materials, RF environment, frequencies being supported, available signal sources, coverage requirements and expected performance throughout the facility.
A properly engineered system isn't simply designed to produce a strong signal. It needs to provide the right signal levels and quality throughout the intended coverage areas while operating within the parameters of the equipment and the networks it supports.
Good engineering also leaves you with something incredibly valuable 5, 10 or even 12 years later: a system that can still be understood, measured and serviced.
When the fundamentals are right from the beginning, you're starting with infrastructure that has a much better chance of aging well.
2. Installation Quality Matters More Than You Might Think
A great DAS design can still be undermined by a poor installation.
RF systems are particularly sensitive to installation quality. Small details matter. Cable routing matters. Connector installation matters. Bend radius matters. Weatherization matters.
Even terminating a coaxial connector deserves care. A connection that looks fine from the outside can introduce loss, reflections or other RF problems if it isn't properly installed.
That's why testing during installation is so important. Cable sweeps and other commissioning tests allow technicians to verify the installed RF path rather than simply assuming everything is working because the cables are connected.
Outdoor components introduce another challenge. Donor antennas, connectors and transmission lines can spend years exposed to rain, snow, ice, heat and freezing temperatures. Proper weatherization at installation can be the difference between a connection that lasts and one that eventually allows moisture into the RF path.
Quality installation isn't just about making the DAS work on day one. It's about making sure it can still work years later.
3. A DAS Isn't "Install It and Forget It" Infrastructure
This is probably the most important part of getting the full life out of a DAS.
The system may stay in the same building, but the cellular network around it doesn't stay the same.
Carriers modify their networks. Frequencies and technologies evolve. Nearby cell sites change. Equipment receives firmware updates. Components age. The RF environment around the building can change.
A system that was properly tuned when it was commissioned may eventually need adjustments to continue performing at its best.
That's why periodic DAS maintenance should include more than checking whether the equipment has power.
Depending on the system, a service visit may include reviewing alarms and system health, checking RF input and output levels, making tuning adjustments, installing applicable firmware updates, inspecting RF connections and weatherization, cleaning equipment and verifying coverage and signal quality throughout the building.
Even something as simple as keeping fans, filters and heat-dissipating fins clean can matter. Telecommunications equipment may operate continuously for years, and heat is not its friend.
The goal is to catch small changes before they become noticeable problems for the people using the network.
Measure the System, Don't Just Look at It
One of the reasons we're able to say a 12-year-old DAS is still performing well is because we're not judging it based on whether the lights on the equipment are green.
We're measuring it.
A DAS should have established performance expectations that can be checked over time. During maintenance, those measurements give technicians something objective to compare against.
Is the system still receiving the signal levels we expect? Are output levels appropriate? Is signal quality where it should be? Are the intended areas of the building still receiving adequate coverage?
That history becomes increasingly valuable as a system ages.
Instead of waiting for someone to report, "My phone doesn't work in this hallway anymore," you have data that can help identify changes earlier.
A 10-Year-Old DAS Doesn't Have to Be an Old DAS
Technology infrastructure doesn't last forever, and eventually equipment becomes obsolete or the cellular networks around it change enough that upgrades or replacement make sense.
But age alone doesn't necessarily tell you how well a DAS is performing.
A system that was properly engineered, carefully installed and regularly maintained can continue doing exactly what it was designed to do many years after commissioning.
That's why seeing one of our older systems still performing well is rewarding.
That's what we strive for at Stiehl Communications. We don't just want to install a DAS that works when we leave the building.
We want to come back 10+ years later, test it again and find that it's still working the way it should.