A cable-free version of Universal Serial Bus took a big step forward Tuesday with the completion of the Wireless USB 1.0 specification, but there is still some work to be done and questions remain about its prospects for widespread adoption.

The specification was created by the Wireless USB Promoter Group, a league of seven vendors that includes the heavyweights of the PC universe: Intel and Microsoft. The group has now handed over management of the standard to the USB Implementers Forum (USB-IF), the governing body for all USB specifications, said Jeff Ravencraft, chairman and president of the Wireless USB Promoter Group. Testing for compliance and interoperability should begin by the end of this quarter in a lab being set up at Intel, he said. The group is aiming for the plug-and-play simplicity of the current wired USB and will certify all products for interoperability before it allows a Wireless USB logo on the packaging, he said.

However, the promoter group is still working out a procedure for introducing two Wireless USB devices for the first time, called "association." Testing for that element of the technology should begin in the third quarter, and the first fully certified products should hit the market late this year, he said.

Wireless USB is intended as a high-speed cable replacement for connections between PCs and consumer electronics devices, or from one device to another. It is based on UWB (ultrawideband), a high-speed, short-range technology that allows Wireless USB to match the speed of wired USB 2.0, achieving 480M bit/sec at 3 meters. However, standardization of UWB in the IEEE is stalled, with two opposing camps meanwhile going forward with incompatible approaches. Wireless USB is based on technology backed by one of those parties, the WiMedia Alliance, of which Intel is a key member. In addition, UWB has not been approved for use by most regulatory bodies outside the U.S. because of concerns over possible interference with other wireless technologies.

Those factors cloud Wireless USB's prospects for reaching the economies of scale that will bring down costs, according to ABI Research analyst Dan Benjamin. Meanwhile, Bluetooth has gained some footing as a wireless cable replacement over the past several years and may get its own speed boost using UWB, and there is a wireless form of the IEEE 1394 interconnect standard in development, Benjamin said.

The IDG News Service is a Network World affiliate.