Sigma Designs has been dabbling in wireless HD technologies for eons, so we aren't going to get too excited until we see this here system-on-chip (SoC) actually hit some products that we care about. Still, the CoAir is a fairly sweet concept, wrapping integrated wireless, coax and gigabit Ethernet capabilities into one single chip aimed at whole home networking. Put simply (or as simply as possible), this chip is the world's first to "simultaneously deliver multiple independent streams of video and data over coax cable, Ethernet cable and wirelessly without compromising quality of service and throughput." Based on the WiMedia standard, it can reach speeds of up to 480Mbps with UWB (ultra-wideband) wireless streaming, and room-to-room linkage via UWB-over-coax can peg those same rates. What we have here is a great basis for building a whole home server on, but until said device emerges and performs flawlessly, we'll just smile and carry on.

D-Link's no stranger to HD streaming, and the outfit is proving that it's still got game by announcing the Coax Ethernet Adapter Kit. The Multimedia over Coax Alliance (MoCA)-certified package consists of two DXN-220 adapters, each of which boast coaxial F-type connectors and an Ethernet port meant to give internet / network access to various rooms without worry over wireless connections flaking out on you. As you can tell, this one was designed to expand home networks without requiring any additional wiring (if you're pre-wired for cable, that is), and being that it operates in the 800MHz to 1,500MHz range, there won't be any interference with cable TV transmissions or the like. The DXN-221 kit -- which includes a pair of the aforementioned adapters -- will be available in Q3 for $199.99, while individual adapters can be purchased for $109.99 apiece.

We really can't comment on the curious timing here, but just after CopperGate picked up the HomePlug AV Powerline business from Conexant Systems, along comes word that the HomePlug AV II specification is just over the horizon. Reportedly, the HomePlug Powerline Alliance is planning to release its next-gen home networking specification "later this year, with first silicon sampling in 2009." We're told that the new spec would simply "build on the existing HomePlug AV specification, developed in 2005, which offers a theoretical bandwidth up to just under 200 Mbits/s." Regrettably, no one could pry a new target speed from the mouths of execs just yet, but you can rest assured it will be at least somewhat speedier (duh).

Let's face it -- HomePlug AV has had a pretty rough go of it, and while we wouldn't consider the technology dead just yet, we can't imagine it ever rising to prominence at this point. Our negativity isn't stopping one CopperGate Communications from following its heart, however, as it just announced this week that it would be taking the business off of Conexant Systems' hands. The pickup makes CopperGate the "the first semiconductor company with home networking technologies supporting all three wire types (coax, phone and power lines)." The deal gives the new owner "all relevant power line technology and silicon products, related patents, appropriate licenses, and requisite personnel," which sounds to us like everything including the kitchen sink. Of course, there's no way of knowing what kind of impact the acquisition will have, but CopperGate's hoping that it will "better prepare the company for the new ITU home networking standard, G.hn." Check out the read link for more details.

While most folks would probably take the hardware-based media streaming approach to get computer / HDD-based media onto their snazzy HD sets, Cyberlink is offering up a reasonable software-based alternative for those looking to pass media around from PC to PC (or HTPC). By installing Cyberlink's Media Server on your media-packed computer, it provides a hassle-free way to open up your files to the home network and share them easily with other connected users. Aside from allowing any UPnP-certified player to locate media across the network, it also supports multiple simultaneous users so long as each connected PC is outfitted with a copy of the firm's SoftDMA application. Although nothing here is truly revolutionary, it does offer up a fairly straightforward approach to achieving the "digital home," and you can pick this up (or download, actually) for $79.95 right now, which will include two SoftDMA licenses to get you going.