For most new offices, Cat6A is the sensible choice for runs to desks, access points and cameras: it carries 10 Gbps up to the full 100 metres and handles higher-power PoE better. Cat6 is acceptable where budgets are tight and runs are short. Fiber belongs in the backbone, between equipment rooms, between floors and anywhere a run exceeds copper's 100-metre limit. Every cable should end on a labelled patch panel and be tested, with the results handed to you.
Cabling is the part of a network nobody thinks about until a ceiling has to be reopened. It usually outlives several generations of switches and access points, so the cheapest time to get it right is before the walls and ceilings close.
The 100-metre rule
Copper Ethernet has a maximum channel length of 100 metres from switch port to device. That is normally divided as up to 90 metres of permanent cable in the walls and ceilings, from patch panel to wall outlet, plus up to 10 metres of patch cords at both ends combined. Beyond that, performance is not guaranteed. In large floors or warehouses, a second equipment closet or a fiber link to a switch nearer the far end solves it.
Copper categories compared
| Cat5e | Cat6 | Cat6A | |
|---|---|---|---|
| Rated bandwidth | 100 MHz | 250 MHz | 500 MHz |
| 1 Gbps | Up to 100 m | Up to 100 m | Up to 100 m |
| 2.5 and 5 Gbps (multi-gig) | Often works at typical lengths | Generally supported to 100 m | Supported to 100 m |
| 10 Gbps | Not supported | Shorter runs only, commonly up to about 55 m | Up to 100 m |
| Higher-power PoE | Works, runs warmer | Works | Better heat handling in large bundles |
| Cable size | Thinnest | Moderate | Thicker and stiffer; needs more pathway space |
| New installs | Not recommended | Acceptable for short, budget runs | Usual recommendation |
Multi-gig results on Cat5e and Cat6 depend on cable quality, length and the environment, so treat those rows as guidance and confirm with testing. You will also see Cat7 and Cat8 advertised. Cat8 is designed for very short, high-speed links inside data centers, not office runs, and Cat7 is not a category recognised by the main US cabling standard. For offices, Cat6A is the practical ceiling.
Why pay for Cat6A when most devices still connect at 1 Gbps? Because the cable stays for ten years or more, and access points with multi-gigabit uplinks are already common. See Wi-Fi 6 vs Wi-Fi 7 for what new access points expect from the cable.
Where fiber belongs inside the office
Fiber is not just for the carrier's connection to the building. Inside an office it is the right choice for:
- Backbone links between the main equipment room and closets on other floors or at the far end of a large floor.
- Runs longer than 100 metres, common in warehouses, campuses and long single floors.
- Electrically noisy areas or links between buildings, where fiber's immunity to interference and lack of electrical connection help.
Multimode or singlemode
Multimode fiber (OM3 and OM4 are the common grades) suits in-building distances and works with lower-cost optics; at 10 Gbps, OM3 is typically rated to around 300 metres and OM4 to around 400. Singlemode fiber (OS2) carries much further and is what carriers use. For a new backbone, many installers now recommend singlemode, or both, because it imposes almost no distance limit on future upgrades. Whatever you choose, the optical modules in your switches must match the fiber type.
The carrier's handoff
Carriers usually deliver service to a point of entry in the building, often a basement telecom room. Getting it from there to your suite is a demarc extension, and who provides and pays for it varies by carrier and building. Ask early, especially for dedicated internet access installs, because a missing extension is a common cause of a delayed turn-up.
PoE: power over the same cable
Power over Ethernet sends electrical power down the data cable, so access points, phones and cameras need no separate outlet. The standards set how much:
| Standard | Also called | Power at the switch port | Typical devices |
|---|---|---|---|
| 802.3af | PoE (Type 1) | Up to 15.4 W | Desk phones, basic cameras |
| 802.3at | PoE+ (Type 2) | Up to 30 W | Most access points, PTZ cameras |
| 802.3bt | PoE++ (Type 3) | Up to 60 W | High-end access points, video endpoints |
| 802.3bt | PoE++ (Type 4) | Up to 90 W | Displays, heated outdoor cameras, some lighting |
Some power is lost along the cable, so the device receives somewhat less than the port supplies. Two practical points: the switch has a total PoE budget as well as a per-port limit, and large bundles of cables carrying high power get warm, which is one of Cat6A's advantages.
Plenum and riser ratings
Cable jackets are rated for where they can be installed. Plenum-rated cable (marked CMP) is made for air-handling spaces, such as many drop ceilings used as return-air paths. Riser-rated cable (CMR) is for vertical runs between floors. Which one your building needs is set by local code and the landlord's rules, so the cabling contractor should confirm it. Using the wrong jacket can fail an inspection.
Patch panels, racks and labels
Every horizontal run should end on a patch panel in the equipment room, not plugged straight into a switch. Short patch cords then connect the panel to the switch. That makes moves and changes a matter of swapping a short cord, and protects the permanent cable from being yanked.
- Label both ends with the same identifier, on the wall outlet and the panel port, following a consistent scheme. The cabling industry has a labelling standard for this, and a contractor should use it or something equivalent.
- Keep a map: a floor plan marked with outlet numbers, handed over at the end of the job.
- Leave service slack in the ceiling or rack so terminations can be redone without re-pulling cable.
- Use cable management on the rack, and patch cords of the right length.
- Separate data from power cabling along the route, and keep the rack ventilated and on a battery backup.
Larger offices may have a main equipment room, often called the MDF, and smaller closets, IDFs, on other floors or areas, linked by fiber or copper backbone runs.
Testing and certification
Ask for every run to be tested with a certification tester, not just checked for continuity. A certification test measures whether each link meets its category's performance standard, and the tester produces a report per link. Keep the report file. Many cable manufacturers offer extended warranties when a certified installer uses their components and submits the test results. Without test results, a "Cat6A" installation is a claim, not a fact.
How many drops to plan
- Workstations: two per desk position is common practice, one for a computer or dock and one spare or for a phone.
- Access points: one per planned location, two where you want room for a future uplink upgrade or redundancy.
- Cameras, door controllers and sensors: one each.
- Meeting rooms: the table, the display, and the room's video system.
- Printers, kiosks, TVs and digital signage.
- Spares: a margin of extra runs to locations you may need later. Adding one during the job costs far less than adding it afterwards.
A worked example
A hypothetical illustration. The office and counts are invented; power figures should come from your own device datasheets.
A 35-person office fit-out plans 35 desks at two drops each (70), 8 access points (8), 6 cameras (6), 4 meeting rooms at two drops each (8) and 4 printers and displays (4). That is 96 runs, which fills two 48-port patch panels exactly, so the plan adds a third panel for spares and growth.
For power: say the access points list 25 W each and the cameras 7 W each. That is 200 W plus 42 W, or 242 W, before desk phones. If 20 desk phones draw around 5 W each, add 100 W, for 342 W. A switch with a PoE budget of 370 W would technically fit with almost no headroom; one with a meaningfully higher budget, or two switches, leaves room for growth and higher-power access points later. The runs to access points use Cat6A, and the office decides to run Cat6A everywhere, since the labour is the main cost and it is the same either way.
Questions to ask your cabling contractor or provider
- Which cable category and jacket rating will you install, and does it meet building code and landlord rules?
- Will every run be certification-tested, and will I receive the test reports?
- Is a manufacturer warranty available for this installation?
- What labelling scheme will you use, and will I get a marked floor plan?
- How much slack and how many spare runs are included?
- Who provides the demarc extension from the carrier's entry point to our suite?
- Will the rack have room, ventilation and power for the switches and a battery backup?
Planning the cable, the switches and the circuit together
Cabling is easiest to get right alongside the move or fit-out timetable; our office move internet checklist and new location guide put it in order with the circuit order. Our managed network service covers the switches and Wi-Fi that plug into it, and we price the circuit across several Tier 1 carriers with no markup, because the carrier pays us. Install windows run from days for shared fiber or coax to 2–4 weeks for a lit building and 60–90 days where construction is needed, so start early. The quote is free with a same-day response. Send us your address, call 478-758-8091 or text (347) 870-0965.
