Homelab Network Cables: Cat6A, Cat8, DAC, or Fiber for Each Link

A common 10-gigabit mismatch we see in small racks is the NAS and the switch disagreeing about what 10G looks like. A UniFi Pro Max or Omada SG switch offers 10G as SFP+ cages. A UGREEN DXP4800 Plus, or a Synology DS1525+ with its 10G module, offers it as an RJ45 jack. Both are 10G, and they do not connect without the right part in between.

That part changes the bill more than most people expect. Linking two SFP+ ports with a direct attach cable costs $13 to $16 and draws about 0.1 W. Bridging SFP+ to RJ45 takes a copper module at $45 to $86 per end that draws about 2 to 2.5 W at its specified maximum and runs warm. Across a rack, those choices add up, and a wrong one usually shows up as a return label or a switch with no free uplink.

Here is how we cable each link, whether your rack runs UniFi, Omada, Synology, UGREEN, or a mix.

Pick the Cable in 30 Seconds

Find the row that matches the link, then read the section for that row.

Start With the Ports, Not the Cable

Most wrong cable purchases start in the cable aisle. Someone decides the rack deserves "the good stuff", buys a bag of Cat8 patch cords, and then finds that the NAS has SFP+ cages or the switch uplinks do. The category printed on a cable jacket is the last decision in the chain.

Write down every link in the rack and answer four questions for each:

1. What port is on each end? RJ45 at 1G, 2.5G, 5G or 10G, or an SFP-family cage (SFP at 1G, SFP+ at 10G, SFP28 at 25G).
2. How far apart are the ends? Same rack, next rack, or another room.
3. Does the link carry PoE? Access points and cameras do. Uplinks and NAS links do not.
4. What speed do both ends actually run? A 10GbE port facing a 2.5G port gives you a 2.5G link, whatever the cable.

An SFP+ cage is a narrow, rectangular metal slot, usually grouped at one end of a switch and labelled "SFP+" or "10G". It does nothing on its own: it holds a DAC, an optical module or a copper module, and that choice is what this article is about.

What 10G Looks Like on UniFi, Omada, Synology and UGREEN

The pattern that causes most of the confusion: switches and gateways tend to expose 10G as SFP+ cages, while NAS units and Wi-Fi 7 access points increasingly expose it as RJ45. The UNAS line is the exception on the NAS side, and the UniFi Pro XG family is the exception on the switch side.

Port details from each vendor's specifications as covered in the linked reviews; UNAS Pro 8 ports and Synology card compatibility re-checked September 2026.

Two rows deserve a second look. "10G only" on the UNAS SFP+ ports means exactly that: those cages will not fall back to 1G or 2.5G, so they need a 10G SFP+ port on the switch. And the Synology DS925+ and DS725+ have no path to 10G, so their owners can skip straight to the 2.5G section and spend nothing on SFP+ gear.

One 10G Link, Four Ways: Cost and Power

Once both ends of a link are SFP+, there are four ways to join them. All carry 10 Gbps. They differ in price, power, heat and reach.

Base list prices, US, checked September 28–29, 2026 on store.ui.com, the Omada Store and fs.com. Ubiquiti's store can show an added surcharge at checkout on some products; these figures exclude it. An FS OM4 LC-LC 2 m patch is $9.40. Power figures are vendor-specified maximums for the modules or cable only, not measured draw, and exclude the switch and device. TP-Link's figure is derived from its datasheet's 750 mA at 3.3 V. ServeTheHome measured 2.7 to 3.0 W per FS RJ45 module at the outlet.

The pattern is plain. A DAC costs roughly a tenth to a fifth of the all-copper route and draws a small fraction of the power. Each step down the table buys reach or flexibility, at the cost of money and heat.

The bottom row is rarely the right answer between two SFP+ ports. It matters because it is what you need when one end only speaks RJ45, which is where most UGREEN and Synology owners land. In that case you buy one module, not two: the NAS keeps its native RJ45 port and the module goes in the switch.

The 2.5G Links: Cat6 Is Enough

Many homelab and small-office racks never need an SFP+ cage. If your NAS is a Synology DS925+ or DS725+, your switch has 2.5G access ports, and your access points plug into them, every link is copper Ethernet and Cat6 handles all of it.

2.5GBASE-T and 5GBASE-T were designed to run over Cat5e at up to 100 metres, so Cat6 gives you margin. Put the money into the switch, not a higher cable category.

This is also where 10GbE Wi-Fi 7 access points land more often than their buyers expect. The Omada EAP773 and EAP787 and the UniFi U7 Pro XG have 10GbE uplinks, but on a 2.5G switch port they negotiate at 2.5G. A Cat6 patch cord is the right cable there, and Cat6A or Cat8 will not change the negotiated speed. Getting them to 10G is a switch and power decision, covered below. Our Omada Wi-Fi 7 setup guide walks through the Omada side.

Conductor gauge matters where PoE flows. Treat this table as a rule of thumb and check the patch cord's own stated PoE rating:

Slim patch cords make a small rack far tidier. AWG alone does not decide PoE suitability: construction, length and bundling matter too. Belden's guidance for 28 AWG patch cords supports power up to 60 W but recommends bundles of 12 or fewer above 30 W. When in doubt on a PoE++ device, use a standard-gauge cord. For bulk in-wall cable and jacket ratings, see our ethernet cable guide, and if you are still deciding whether to leave 1G, start with the 2.5 Gigabit upgrade guide.

Existing Wall Runs or a New Pull?

The cable already in your walls changes the answer, so it gets its own branch.

• Existing Cat5e or Cat6, links at 1G to 5G: keep it. Cat5e runs 2.5G and 5G to 100 m.
• Existing Cat6, links at 10G: it may work, but it is not guaranteed. TIA guidance expects 10GBASE-T to run on Cat6 channels up to 37 m, and between 37 and 55 m depending on alien crosstalk. Long or bundled runs need testing. Short, sound Cat6 patch cords are fine.
• A new pull that may ever carry 10G: Cat6A. It is the specification for 10G at the full 100 m, and the price gap over Cat6 is small next to the cost of opening the walls twice.
• A new run to another building or a long backbone: fiber, covered below.

SFP+ to SFP+: Use a DAC Inside the Rack

When both ends are SFP+ cages within a few metres, a passive direct attach cable is the default. A DAC is a short run of copper twinax with an SFP+ connector permanently attached at each end. In most cases nothing needs configuring: once both ends are seated, the link comes up at 10G.

The pairings where this is the answer:

• UniFi Dream Machine Pro Max to a Pro Max 16/24 PoE switch: gateway SFP+ to switch SFP+ uplink.
• UniFi UNAS Pro 4 or UNAS Pro 8 to a Pro Max or Pro XG switch: a DAC to a 10G switch cage satisfies the "10G only" ports.
• Omada ER8411 to an SG3428XPP-M2 V2 or SG2210XMP-M2: the SM5220-1M or any compatible DAC.
• Synology DS1825+ with an E10G30-F2 dual-SFP+ card to a switch: the card accepts DACs as well as SR and LR optics.

Lengths: UniFi sells its 10G DAC in 0.5, 1 and 3 m. TP-Link's Omada Store lists 1 m ($15.99) and 3 m ($24.99). FS sells generic passive DACs from 0.5 to 7 m. In one rack, 0.5 or 1 m covers most links.

Compatibility: UniFi and Omada switches generally accept third-party DACs and optics. Some NICs and switches enforce vendor coding, and Synology validates its add-in cards against its own compatibility list, so check it before buying a generic cable for a DS1825+.

DAC vs AOC

A DAC gets thick and stiff as it lengthens, and passive copper tops out at a few metres. For a fixed link of about 5 to 30 m, an active optical cable is the next step: optical transceivers bonded to each end with thin fiber between them. UniFi's 10G AOC runs 5, 10, 20 and 30 m from $39 for 5 m, and FS lists a generic 5 m at $36.

The trade-off is flexibility. An AOC is one sealed assembly, so it cannot be re-terminated or pulled through small conduit with the ends attached. For a run that may change or goes through walls, use separate modules and fiber. On the UniFi Pro XG 24 and 48, whose uplinks are 25G SFP28, the same logic applies with SFP28 cables; our UniFi fiber and SFP guide covers 25G and 100G.

SFP+ Switch to RJ45 NAS or Access Point: The Module Question

This is the mismatch from the top of the article. The pairings:

• UGREEN DXP4800 Plus or DXP8800 Plus (10GbE RJ45) to a UniFi Pro Max or Omada SG switch (SFP+ uplinks).
• Synology DS1525+ with the E10G22-T1-Mini (10GbE RJ45) to the same switches.
• Omada EAP773/EAP787 or UniFi U7 Pro XG (10GbE RJ45) when you want the access point at 10G rather than 2.5G.

There are two ways to join them.

Path 1: A Switch With Native 10GbE RJ45 Ports

A Cat6A patch runs straight from the NAS or AP to the switch. On the UniFi side, the Pro XG 8 PoE has eight 10GbE PoE ports, two SFP+ cages and a 155 W PoE budget. It lists at $499 in Ubiquiti's US store, with a higher total shown once the store's surcharge is included. That is far more than two modules cost, so native ports are not automatically cheaper. They earn their place when you need several 10G copper ports, 10G PoE for access points, or cages for other jobs. Our UniFi switch guide covers where they fit.

Path 2: An SFP+-to-RJ45 Module in the Switch

A copper module turns one SFP+ cage into a 10GbE RJ45 port:

Sources: Ubiquiti tech specs, TP-Link SM5310-T datasheet, FS listings. Prices checked September 28–29, 2026.

Multi-speed support matters. A module that negotiates 2.5G and 5G can serve a NAS that runs at 2.5G today and moves to 10G later. TP-Link notes that when the SM5310-T sits in a 10G slot facing a 2.5G or 5G peer, flow control may need enabling on the switch port.

Copper modules run warm. Each dissipates a couple of watts inside a small metal cage, and two side by side heat each other. Where the layout allows, leave an empty cage or a DAC between them, and keep the switch where air can move. For the cable itself, use a Cat6A patch for 10G.

The Access Point Power Chain

A module and a Cat6A cable carry data, not PoE. A 10GbE access point on that link still needs a power source, and each AP is different:

Sources: Omada Store product pages and EAP787 datasheet; StorageReview and our own guide for the U7 Pro XG.

The three ways to power a 10G access point:

1. A native 10G PoE port on the switch, such as the Pro XG 8 PoE. One cable, no extras.
2. A module plus an inline 10G PoE injector. The UniFi 10G PoE++ Adapter (60 W) is $39. The Omada POE380S (up to 90 W, 10G ports) is $69.99, marked down from $89.99. Use a 10G-rated injector; a gigabit one caps the link at 1G.
3. A DC adapter where the AP supports one. It works, but it needs an outlet beside a ceiling-mounted AP, which is rarely practical.

If a 10G AP is not essential, connect it to a 2.5G PoE port with a Cat6 patch and skip all three.

A Worked Bill: Adding 10G to an Existing Rack

Say the rack already has a UniFi Pro Max 24 PoE with the gateway on one SFP+ cage and one cage free. Base list prices, September 28–29, 2026, patch cords not priced:

The module route is cheaper for one device. The third row is where it stops working: there is one free cage, so a second copper device needs a different design, and the $512 buys six more 10G copper ports and PoE++ on all of them. On Omada the arithmetic differs. An SM5310-T is $44.99, and the SG3428XPP-M2 V2 recommends only one, so a NAS takes that module and the access points stay on 2.5G PoE++ ports.

The NAS-side reading for these pairings lives in our UNAS Pro 4 vs DXP4800 Plus comparison, the UGREEN vs Synology guide and the Synology DS1525+ review, which covers the E10G22-T1-Mini.

Leaving the Rack: Fiber and LC-LC Patches

When an SFP+ backbone link has to leave the rack (to an office, a second rack, a garage), fiber often fits better than copper modules. It is thin, runs cool, ignores electrical interference, and reaches far beyond any house.

The default homelab link is two 10GBASE-SR modules joined by a duplex LC-to-LC multimode patch:

• Modules: UniFi's 10G multimode module is $20 and draws 0.8 W max. TP-Link's SM5110-SR is $17.99 on the Omada Store. FS's generic SR module is $25 at 1 W max.
• Fiber: an OM4 LC-LC duplex patch. FS lists a 2 m cord at $9.40.

That is roughly $45 to $60 for a short rack-to-rack link, which covers parts only. The 2 m patch cord is priced for the shelf; longer runs are priced by the cable length, so budget for the cable you need. Copper RJ45 modules run $45 to $86 each and reach 30 m on the TP-Link and FS options. Reach depends on the module: Ubiquiti and FS list 300 m on OM3 and 400 m on OM4, while the SM5110-SR lists up to 300 m on 50/125 µm fiber. Check the listing for your module, though any of them far exceeds a home run.

A rack patch cord is not built for a run between buildings. For a garage or outbuilding, use cable rated for the pathway (outdoor or indoor/outdoor jacketed, usually with conduit), terminated or spliced to the LC connectors, and check local code. Keep the cheap LC-LC patch cords for inside the rack and equipment room.

OM4 costs little more than OM3, so it is a sensible default for new patch cords; if you already have OM3 in the wall, keep using it. Single-mode with LR or BiDi modules suits runs between buildings and is covered in our UniFi fiber and SFP guide. If you are deciding between fiber and Cat6A through the walls, read our fiber vs Cat6A guide.

Cat6A vs Cat8 in a Homelab

Cat8 patch cords are heavily marketed with "40 Gbps" on the packaging, so the question comes up often.

The facts are short. Cat8 is specified for 25GBASE-T and 40GBASE-T over copper up to 30 metres, a data-centre standard for switch-to-server links. Not one switch, NAS or access point in the port table has such a port. The fastest RJ45 port in that gear is 10GbE, and Cat6A carries 10G to the full 100 metres.

At the speeds a homelab runs, Cat8 performs the same as Cat6A. What it adds is a thicker, stiffer, shielded cable that is harder to dress in a small rack and, in the low-cost market, a category claim that is often undocumented.

For the in-wall version of this decision, see our Cat6 vs Cat8 office guide.

Four Racks, Cabled

Four common setups, as starting points rather than fixed kits.

1. The 2.5G shelf

Gear: a Synology DS925+ or a UGREEN NAS at 2.5G, a 2.5G switch, one or two Wi-Fi 7 APs.

No SFP+ parts at all. This suits most homes and small offices and leaves the switch's SFP+ cages free.

2. UniFi rack with a UNAS Pro 4

Gear: UDM Pro Max, Pro Max 24 PoE, UNAS Pro 4.

Both SFP+ cages on the Pro Max 24 PoE are now in use, which matters if a 10G workstation is coming.

3. Omada rack with a Synology DS1525+

Gear: Omada ER8411, SG3428XPP-M2 V2, Synology DS1525+ with the E10G22-T1-Mini, EAP773 access points.

Two SFP+ cages remain. A DAC or fiber device fits there. A second SM5310-T does not, given TP-Link's one-module recommendation for this switch.

4. Mixed rack: UniFi or Omada switch with a UGREEN DXP4800 Plus

Gear: a Pro Max 24 PoE or SG2210XMP-M2, a UGREEN DXP4800 Plus, and a gateway with an SFP+ uplink.

Both cages are now used. The worked bill above shows when a Pro XG 8 PoE becomes the better answer. For layout, labelling and airflow, see our rack cable management guide, and for outages, the UPS guide for UniFi racks.

Common Mistakes

• Buying Cat8 for 2.5G links. The link runs at what the ports negotiate, and Cat6 already carries it.
• Using every SFP+ cage on modules. Count cages, and check the vendor's module limit.
• Forgetting PoE on a module link. A 10GbE access point still needs an injector, a PoE++ port or a DC supply.
• Pairing an SR module with single-mode fiber. SR goes with multimode, LR with single-mode.
• Putting 30 AWG slim patches on PoE++ devices. Keep the thinnest cords for data.
• Planning a 10G upgrade for a Synology DS925+. It has no 10G path; the DS1525+ and DS1825+ do.

Related Resources

• UNAS Pro 4 vs UGREEN DXP4800 Plus: the SFP+ vs RJ45 NAS decision from the storage side.
• UGREEN vs Synology NAS: which platform fits, including the 10GbE cost of each.
• Omada Wi-Fi 7 Business Setup: full Omada builds with the SFP+ uplinks this article cables.
• Best UniFi Switches: Pro Max vs Pro XG and where native 10GbE ports make sense.
• UniFi Fiber and SFP Guide: single-mode, BiDi, 25G and 100G module selection.
• Is 10GbE Worth It?: how to tell whether your workload needs 10G before you buy.
• Best Ethernet Cables: bulk Cat6 and Cat6A for in-wall runs, jacket ratings and conductor quality.