Network & Connectivity

TP-Link TL-SG108 Review: One Drop, Eight Devices

An unmanaged gigabit switch in a fanless metal case. It turns one Ethernet run into eight, and the absence of a fan is why it can live on a desk.

By Antoni DaskalskiPublished 14 August 20263 min read

Before you buy anythingThis page also considers a managed or easy-smart switch, Running a second cable and a powerline kit or mesh node. Why, and when each is the better answer.

Contents

This is the correct answer to a narrow and very common problem, and it is close to the cheapest correct answer available. The specification that decides whether it belongs on a desk rather than in a cupboard is that it has no fan.

A note on this assessment: researched from TP-Link's published specification, not installed on a network here. See how we test.

The problem it addresses

Getting one Ethernet cable to a room is work — clips, a doorway crossing, a route along a skirting board. Getting four cables there is four times the work and it looks like it.

But the far end almost never has one device. It has a PC, a console, a TV, and increasingly a NAS or a capture box. The switch is what makes one run serve all of them, which is exactly the role running Ethernet around a room assigns it: do the hard part once, then fan out at the destination.

How it is specified

Model: TL-SG108
Ports: 8 x 10/100/1000 Mbps, non-blocking
Cooling: Fanless
Enclosure: Metal
Management: Unmanaged, plug and play
Negotiation: Auto-negotiation per port

Two lines matter more than the port count: metal, and fanless.

Why fanless is a specification and not a detail

A network switch is a box that runs permanently. If it has a fan, that fan runs permanently too, in the same room as the person the switch was bought for.

This site spends a whole category on making a PC quieter, and there is no sense in silencing a tower and then adding a small continuously-spinning fan two feet away. Passive cooling is why this can sit on the desk, behind the monitor, or on the shelf under it — anywhere convenient, rather than banished somewhere with a spare socket.

The metal case is what makes passive cooling work, which is why the enclosure material is listed as a specification rather than a finish.

What it does well

Fanless, so it can live in the room it serves
Metal enclosure doing real work as the heatsink
Eight non-blocking gigabit ports — every port can run at full speed at once
Unmanaged and plug-and-play, with no configuration to maintain or forget
Auto-negotiation per port, so mixed-speed devices coexist without thought
Cheap enough that a second one at another drop is not a decision

What it does badly

No VLANs, no port mirroring, no statistics
No Power over Ethernet
Gigabit ceiling — multi-gig hardware negotiates down
Adds a box and a power supply for a single-device far end
A port silently running at 100 Mbps looks identical to one running at 1 Gb

Ugly score 5, and it earns it

A small black or white metal box with eight lit ports and a wall wart. It is inoffensive and it is never the object that spoils a desk — what spoils the desk is the eight cables now converging on it, which is a consequence of the switch rather than the switch itself.

That bundle is worth planning for at installation rather than discovering. Everything in hiding desk cables without blocking upgrades applies with more force once there is a switch in the middle of it.

Where it stops being the right tool

The silent downgrade

This is the limitation worth knowing because it will eventually cost someone an evening. Gigabit Ethernet uses all four wire pairs; 100 Mbps uses two. A cable that has lost a conductor does not fail — it negotiates down to 100 Mbps and keeps working, and the link light on the switch looks exactly the same.

The switch cannot tell you this. The operating system can, in one reading, and the method is in finding the bad Ethernet cable. Check there before blaming the switch or the router.

One device does not need it

A switch at a far end serving a single PC is a box, a power supply and a hop achieving nothing the cable was not already doing. The value is entirely in the fan-out.

Multi-gig and PoE are different products

If the network is already 2.5 GbE, or if the far end is an access point or a camera wanting power over the cable, this is the wrong model. TP-Link sells both variants under closely similar names, so read the suffix rather than the family.

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TP-Link TL-SG108 8-port gigabit switch

TP-Link

Gigabit, unmanaged, no PoE. Check the model suffix — TP-Link sells 2.5 G and PoE variants under very similar names.

Check price and availability

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Who should buy it, and who should not

Buy it if a single Ethernet run has to serve more than one device, which describes most rooms that have had a cable run to them at all. It is one of those purchases where the correct product is also the cheap one and there is very little to decide.

Skip it if the cable run itself is the problem rather than the port count — the alternatives to running one at all are compared in powerline vs mesh vs Ethernet, and if the real complaint is wireless behaviour then fixing bad gaming Wi-Fi is the page to read first.

Would we buy it again?

Yes, with no real reservation. It is a component rather than a product: it does one thing, it does it silently, and the only interesting decision it presents is remembering to check the model suffix.

The verdict

Fix score9/10

How well it solves the stated problem.

Ugly score5/10

How much it offends the eye. Higher is uglier.

Value9/10

Worth the money, clutter and shelf space.

Would we buy it again?: Yes
Best for: The far end of a single Ethernet run that has to serve a PC, a console, a NAS and a TV — where the alternative is running three more cables across a room.

If this is not right for you

A managed or easy-smart switch: Adds VLANs, QoS and per-port statistics for a modest amount more, which matters if you want to separate work traffic from a games console or diagnose which port is saturating.
Running a second cable: No extra box, no power supply and no hop — genuinely simpler when only two devices need connecting and the route already exists.
A powerline kit or mesh node: Avoids the cable run entirely, which is sometimes the only option in a rented flat, at a substantial and variable cost in throughput and latency.

Questions people actually ask

Does adding a switch increase latency?

By an amount you will not measure in a game. A store-and-forward gigabit switch adds microseconds per hop, against network round trips measured in milliseconds. The concern is real in a data centre and irrelevant at a desk.

Unmanaged or easy-smart?

Unmanaged, unless you have a specific reason. Managed features are configuration surface you have to maintain, and the common domestic use — turning one drop into several — needs none of them. Buy managed when you actually want VLANs, not in case you might.

Will it do 2.5 gigabit?

No. Each port is 10/100/1000, so a 2.5 GbE network card negotiates down to 1 Gb. If the rest of the network is already multi-gig, this is the wrong model and TP-Link sells a 2.5 G variant under a similar name — check the suffix rather than the family.

Does fanless mean it runs hot?

It means the metal case is the heatsink, which is why the enclosure material is a specification rather than a finish. Give it air on at least one side and do not stack anything on it. A gigabit eight-port switch dissipates very little.

Why does my device show 100 Mbps through the switch?

Almost always the cable, not the switch. Gigabit uses all four wire pairs and 100 Mbps uses two, so a cable with a broken conductor silently negotiates down instead of failing. Check the link speed in the adapter properties and test the cable before suspecting the switch.

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