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A USB powerline adapter connects a computer to a network carried over a building’s electrical wiring: USB links the computer to the adapter, and a mains outlet connects it to the powerline network. It is not a USB Wi-Fi adapter, which gives the computer wireless access to an existing Wi-Fi network.
How a USB powerline adapter works
The adapter has two distinct connections: a USB connection to the computer and a plug for an electrical outlet. Instead of sending data over Wi-Fi, it uses the building’s electrical wiring as the network path. The PLANET PL-104U is a documented example; its product page identifies USB Type-B and HomePlug 1.0. PLANET PL-104U product page
The PL-104U page lists a powerline interface rate of up to 14 Mbps. That is a historical, model-specific manufacturer specification—not a typical or guaranteed speed for powerline networking generally. PLANET’s product resources date from 2007–2008.
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| Type | Computer or device connection | Network path | Typical purpose |
|---|---|---|---|
| USB powerline adapter | USB | Building electrical wiring | Connect a computer to a powerline network using a USB adapter |
| USB Wi-Fi adapter | USB | Wi-Fi | Add Wi-Fi connectivity to the computer that holds the adapter |
| Ethernet powerline adapter | Ethernet | Building electrical wiring | Give a LAN-ready device a wired network connection through powerline equipment |
The names describe different connections, not interchangeable devices. A USB Wi-Fi adapter connects its host to wireless networking; a powerline adapter uses electrical wiring for the network path. Sony’s home-network guidance lists powerline connectivity separately from a USB wireless LAN adapter. Sony home-network connection guidance A LAN-ready device can use a powerline connection when the specific powerline equipment provides the appropriate interface, such as Ethernet; that does not make it a USB powerline adapter.
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What to check before using a legacy USB model
USB powerline products documented here are legacy models, so check the exact model and host requirements rather than assuming current operating-system support, availability, or compatibility.
- Operating system and drivers: The Linksys PLUSB10 version 2 installation guide describes driver/software-CD setup and lists Windows 98SE, 2000, Millennium, or XP as supported systems. That is specific to the guide and version; it does not establish compatibility with current systems. Linksys PLUSB10 version 2 installation guide
- Powerline standard: Confirm the standard used by the adapter and the other powerline equipment. The PL-104U uses HomePlug 1.0, a model-specific detail that should not be assumed for other products.
- Support status: Linksys lists PLUSB10 support in the USA as ending on 2 August 2022. This is a support-status record, not evidence of current stock or support elsewhere. Linksys products end-of-life listing
- Device-side port: Check whether the equipment connects to the computer by USB or to a network-ready device by Ethernet. Similar use of household wiring does not make those product types equivalent.
Is a USB powerline adapter a current buying category?
The documented examples—PLANET PL-104U and Linksys PLUSB10—are older products, and the available documentation does not establish their present-day availability or compatibility with current computers. The evidence for these models does not support treating USB powerline adapters as a currently supported category. If the goal is to carry a network connection over household wiring to a LAN-ready device, Ethernet powerline equipment is a separate category to investigate; verify the exact device and network-standard compatibility before choosing it.
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