EMZETT.Docking Stations
Photo: In short: Devices connected to a laptop via a single cable (often USB-C), providing several additional ports — e.g. for monitors, network, USB peripherals and power.
In more detail: Docking stations solve the problem of limited ports on modern, thin laptops: instead of connecting every device individually, you just plug one cable into the docking station and instantly have access to all peripherals connected to it. Many modern docks use USB-C with Power Delivery to charge the laptop at the same time.
In Depth
Several protocols over one cable
Technically, most modern docking stations use the USB-C connector not just for classic data transfer, but for several protocols transmitted simultaneously over the same physical line: “USB Power Delivery” for powering the laptop, “DisplayPort Alt Mode” (or Thunderbolt) for video transmission to external monitors, and normal USB data transfer for connected peripherals — all of this runs in parallel over a single cable, which is what technically enables the docking experience of “plug in one cable, everything’s connected”.
Hub vs. real docking station
Important in practice is the distinction between a simple USB hub (only distributes additional USB ports, usually with no video output of its own) and a real docking station (also distributes video outputs, network, power). Some manufacturers also market plain USB hubs as a “docking solution”, even though they’re functionally considerably more limited than a full-fledged docking station with its own chipset for video output.
Thunderbolt docks vs. USB-C docks
For more demanding use cases (several high-resolution monitors, very fast external drives), Thunderbolt docking stations are superior to simpler USB-C docks: Thunderbolt offers considerably more total bandwidth (up to 40 Gbit/s) and allows real PCIe tunnelling, which, for example, lets an external graphics card be run through the dock — a feature pure USB-C docks technically can’t offer.
Compatibility pitfalls
Whether a docking station can, for example, drive two external 4K monitors at once doesn’t just depend on the docking station itself, but also on whether the laptop’s USB-C port actually supports DisplayPort Alt Mode or Thunderbolt at all — not every USB-C port on a laptop can do this equally, even if it looks identical from the outside. Before buying, it’s therefore always worth checking the datasheet of your own laptop, not just the docking station’s.
See also: USB-C, Peripherals, Monitor, Ports