When we surveyed the power-line network landscape in January , only one product based on the fastest version of the Homeplug AV2 standard was available. Promising nominal speeds up to 1200 megabits per second, the ZyXel PLA5405KIT was faster than anything we tested, but it was also the most expensive kit in the roundup. Now Trendnet joins the fray with its Powerline 1200 AV2 Adapter Kit (Trendnet's model number TPL-420E2K). Trendnet's offering falls short of Zyxel's in terms of performance, and its current street price is $17 higher.
The Trendnet TPL-420E2K delivered TCP throughput of 94 Mbps, which is somewhat slower than the 115 Mbps average of the Zyxel, but still faster than the products without the optional enhancements. Either product is worth considering for back-up devices or entertainment centers that need high-bandwidth for streaming media, something Wi-Fi can't always provide.
Like other HomePlug AV2 kits, the Trendnet TPL-420E2K ships with two small boxy adapters that plug directly into wall outlets. Each adapter has a gigabit ethernet port, and the kit includes two five-foot ethernet cables as well. The size of the adapters might block the second outlet (especially if you need to plug in another wall wart).
To create the power-line network using an existing Wi-Fi router (the most likely scenario for most people), you plug one of the adapters into a free wall outlet and run a cable from its ethernet port to a free LAN port on the router. Now you can plug in the second adapter to a free outlet near a device you wish to add to your network and run the second cable from the adapter to the device's ethernet port.
Use a wall outlet rather than, say, a power strip, which likely has surge-suppression technology that can degrade the ethernet signal.
The technology is plug-and-play, meaning it requires no additional setup to work. Should you wish to add another HomePlug device, however, you'll need to sync it to the network, typically by pressing buttons on both the new and one of the existing adapters (or by typing the adapter's unique identifier into a software utility that most vendors provide). Data is encrypted using 128-bit AES.
A HomePlug AV primer
For those who don't follow the minutiae of HomePlug AV standards for networks that use existing electrical wiring, HomePlug AV2 (the third-generation HomePlug spec) includes both mandatory and optional components. The first wave of HomePlug AV2 products were based on the mandatory components only, which promised nominal network speeds of up to 600 megabits per second and delivered 60 to 70 Mbps in our real-world tests.
The second wave of HomePlug AV2 products utilize the MIMO (multiple input, multiple output) concept first introduced with high-speed Wi-Fi routers. But this requires using all three wires in your home's walls: line, neutral, and ground. If you live in an older home that doesn't have grounded wiring (and three-prong outlets), you won't be able to use this type of power-line adapter.
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