Networking basics for security contractors

TL;DR — Before you pull a single cable on a networking job, choose the right cable category, calculate the PoE power budget, and plan the rack layout. Fixing any of those after the walls are closed costs far more than getting them right before the job starts.

If you’ve spent your career on panels, cameras, and access control, networking can feel like a different trade wearing the same tool belt. It isn’t. The same job-site discipline still applies. The difference is knowing which decisions drive cable performance, device power, and rack serviceability before the install starts.

Why security contractors are suddenly in the networking business

Every device you’ve ever installed for a client already depends on a network. Cameras stream over it. Access control panels report over it. Alarm.com integrations, video analytics, and remote monitoring all ride the same cable you might currently be treating as an afterthought. As more security systems depend on network infrastructure, more contractors are choosing to include structured cabling, switching, and rack hardware in their own scope instead of leaving it to another trade.

Mike Capulli, COO at Security Data Supply, has a phrase for this: “from the jack to the rack.” The jack is the wall plate where a device connects. The rack is where those connections terminate, get switched, and get powered. Everything in between, cable, connectors, patch panels, and switches, is a single connected system. A contractor who understands all of it can bid work that a camera-only or access-control-only competitor can’t.

This matters commercially, too. A security contractor who can also specify and install the network backbone captures more of the jack-to-rack scope instead of watching another contractor or IT vendor take that portion of the project.

On almost every commercial camera or access control project, someone is already specifying the cable, switch, and rack infrastructure. When you can confidently own that part of the design, the customer gets one point of responsibility and you capture more of the scope already built into the job.

Cat6 vs Cat6A: which cable should you actually pull

Choosing between Cat6 and Cat6A isn’t about picking the “better” cable. It’s about matching the cable to the bandwidth requirements, installation environment, and expected life of the system.

When Cat6 still makes sense

Cat6 is a proven, cost-effective cable that’s been the default for commercial networking for years. For standard IP cameras, access control readers, and installations without significant future bandwidth requirements, it’s still an excellent choice.

When we recommend Cat6A

Cat6A supports 10 Gbps across the full 100-meter channel and provides additional bandwidth headroom for higher-performance applications. While modern Cat6A designs are often easier to install than earlier generations, pathway and conduit requirements still depend on the specific cable being used. As clients continue adding higher-resolution cameras, wireless access points, and bandwidth-intensive applications, Cat6A is often the preferred choice on new commercial installations where long-term flexibility matters.

Rule of thumb

Here’s the rule of thumb we give contractors at the counter: if the project includes wireless access points, high-resolution multi-sensor cameras, or any device the client might upgrade in the next five years, pull Cat6A. The cost difference per run is small compared to the cost of re-pulling cable through a finished ceiling because the client’s new camera platform needs more bandwidth than the cable you installed can carry.

Common mistake: Most contractors don’t get the cable choice wrong by picking Cat6. They get it wrong by picking Cat6 for a building that’s almost certain to need higher-bandwidth devices within the next few years.

Counter example: A contractor came to the Security Data Supply counter planning to reuse Cat6 on a commercial office renovation. After talking through the customer’s expansion plans, the discussion shifted toward Cat6A because the building was expected to add wireless access points over the next few years. Spending a little more on cable before the walls were closed cost far less than pulling new cable after the building was occupied.

Power over Ethernet: matching your switch to what’s on the wall

The most common mistake we see on networking jobs isn’t the cable. It’s the power budget. Contractors spec a switch based on port count and forget to check whether it can actually power everything plugged into those ports.

PoE (802.3af). Typically supports standard IP cameras and basic access control readers, delivering up to 13 watts of usable power.
PoE+ (802.3at). Supports higher-power devices such as PTZ cameras, heated outdoor cameras, and most powered door hardware, delivering up to 25.5 watts.
PoE++ (802.3bt). Supports higher-draw devices such as multi-sensor cameras, video intercoms with displays, and some newer wireless access points, delivering up to 71 watts.

The math that trips people up: a 24-port switch rated for “PoE+” doesn’t necessarily mean every port can deliver 25.5 watts simultaneously. Check the switch’s total power budget, not just the per-port maximum. For example, if sixteen cameras each require 18 watts, the switch needs at least 288 watts of available PoE capacity before accounting for future growth. A 24-port PoE+ switch can advertise PoE on every port while still lacking enough total wattage to power every connected device at full load. When that happens, you’ll often see intermittent device failures that look like bad cameras or network issues when the real problem is the switch running out of available PoE power. It’s one of the most common callbacks we hear from contractors who are just starting to take on networking work, and it’s almost always preventable with a quick power-budget calculation before the equipment is ordered.

If you’re unsure whether a switch has enough available PoE capacity, that’s the kind of question worth asking before the order goes in. It’s much easier to change a switch on paper than after it’s mounted in a rack.

Building the rack right the first time

A rack that’s planned and wired correctly on day one saves everyone, you, the client, and the technician servicing it five years from now, hours of frustration. Here’s the checklist we walk contractors through before the equipment is mounted.

Plan the rack layout before you mount anything. Keep patch panels, cable management, and switches arranged so patch cables stay short, airflow remains unobstructed, and future service work is straightforward.
Terminate permanent cable runs at patch panels rather than directly into switches. It takes a little more time upfront but protects switch ports, makes changes easier, and allows patch cords to be replaced without disturbing the in-wall cabling.
Label every single run, both ends. A rack with 48 unlabeled patch cables is a liability the day the original installer isn’t available to troubleshoot it.
Size your UPS to the actual load, plus headroom. A rack running cameras, access control, and networking gear for a client who needs uptime during a power event needs battery runtime calculated against real draw, not a guess. Calculate the actual wattage draw of the equipment you’re protecting, then leave capacity for future expansion.
Leave room for cable management, airflow, and future equipment. The rack you install today will almost always have something added to it later, and a rack packed tight from day one is difficult to expand or service.

A clean rack isn’t just easier to look at. It’s easier to troubleshoot, easier to expand, and easier for the next technician to understand without tracing every cable by hand.

The shortcuts we see most often happen under time pressure: skipping labels and undersizing backup power. Both save a little time during installation, but they usually cost far more during service calls. Spending an extra thirty minutes documenting the rack and sizing power correctly can save hours of troubleshooting years later.

What this means for your next bid

Networking isn’t a separate trade bolted onto security work anymore. It’s the foundation everything else depends on. Contractors who can confidently specify the right cable, calculate a real PoE budget, and build a serviceable rack are better positioned to include the network scope instead of handing that portion of the project to someone else. That means more work on jobs you’re already bidding and more value you can bring to your customers.

That’s what “from the jack to the rack” really means. Not selling more products, but helping contractors confidently own more of the job.

If you’re bidding your first networking-inclusive job, or your tenth, your local Security Data Supply counter team can help you work through cable selection, PoE budgeting, and rack hardware before you finalize the bid, not after you’ve already ordered the wrong switch.

Ready to plan your next networking job? Find your nearest Security Data Supply branch or call ahead to place a will-call order for cable, switches, and rack hardware.

Frequently Asked Questions

Do I need Cat6A for every job, or is Cat6 still worth using?

Cat6 is still appropriate for straightforward jobs with fixed, known device requirements, like a single standard IP camera or a basic access control reader with no planned upgrades. Cat6A is usually the better choice when the job includes wireless access points, multi-sensor or analytics-heavy cameras, or a reasonable expectation of future upgrades. The additional cable cost is often far less than the cost of pulling new cable after the building is occupied.

What’s the difference between PoE, PoE+, and PoE++?

PoE (802.3af): delivers up to 13 watts per port and covers basic cameras and readers.
PoE+ (802.3at): delivers up to 25.5 watts and covers PTZ cameras, heated outdoor cameras, and most access control hardware.
PoE++ (802.3bt): delivers up to 71 watts per port and supports higher-draw devices such as multi-sensor cameras, video intercoms, and some newer wireless access points.

Why does my switch’s port count not match how many high-power devices it can actually run?

Switches have a total power budget that’s separate from the per-port maximum. A switch can be rated for PoE+ on every port but not have enough total wattage to power all those ports simultaneously at full draw, which causes intermittent device dropouts that look like a hardware problem but are actually a PoE power issue.

Should I terminate cable directly to my switch or to a patch panel?

Terminate permanent cable runs at a patch panel, then use short patch cords to connect to the switch. This protects switch ports, makes future changes easier, and lets patch cords be replaced without disturbing the in-wall cabling.

How do I size a UPS for a rack running cameras, access control, and networking gear together?

Calculate the actual wattage draw of the equipment you’re protecting, then leave room for future expansion. Guessing instead of calculating often leads to backup systems that don’t provide the runtime the customer expects during an outage.

Can security contractors realistically add networking to their service offering without hiring dedicated IT staff?

For many commercial security projects, yes. Structured cabling, rack assembly, and PoE infrastructure build naturally on the skills most security contractors already have. More advanced network design, cybersecurity, VLAN configuration, or enterprise IT integration may still require additional expertise or coordination with the customer’s IT team.

How much extra does Cat6A typically cost compared to Cat6?

Material pricing changes over time and varies by manufacturer, but on most commercial projects the additional cable cost is small compared to the labor required to replace cable after walls and ceilings are finished. That’s why we usually recommend evaluating the total lifecycle cost of the installation, not just the initial cable price.

About the Author

Ron Broussard is CEO of Security Data Supply, an independent wholesale distributor serving security, fire alarm, access control, CCTV, networking, AV, and other low-voltage contractors through its network of locally owned branches.

Methodology

This article combines guidance used by Security Data Supply counter teams when helping contractors plan structured cabling, PoE infrastructure, and rack hardware with current manufacturer documentation and published industry standards.

Before You Wire the Rack: Three Networking Decisions Every Security Contractor Needs to Make