Friday, 3 August 2007
Two manufacturers of laptop PCs and two designers of wireless hubs and adapters are the first companies to receive consumer product certifications from the Universal Serial Bus Implementers Forum (USB-IF). The Certified Wireless USB products are expected to be in stores for the back-to-school and holiday gift season.
Previously certified silicon from Alereon, Intel Corp., NEC Corp., Realtek Corp., and WiQuest Communications are integrated into the products, according to the USB-IF.
The two laptop companies are Dell Computer for its Inspiron 1720 notebook and Lenovo for its ThinkPad T61/T61p 15.4-inch Widescreen Notebook. Networking companies D-Link and IOGear each had a wireless hub and also an adapter certified. Certification of the Wireless USB protocol by the USB-IF assures the interoperability of devices from a variety of manufacturers.
Certified Wireless USB is based on the WiMedia Alliance's Ultra-WideBand (UWB) common radio platform, which is capable of PHY-layer data rates of 480 Mbit/s at distances up to 3 meters and 110 Mbit/s at up to 10 meters.
From an engineering perspective, the question of co-existence with other wireless technologies in the 3 GHz band has been a persistent question for Wireless USB.
Dell and Lenovo have announced the first notebooks with embedded Certified Wireless USB chips - the Dell Inspiron 1720 and Lenovo ThinkPad T61and T62p. The laptops connect wirelessly to USB peripherals hooked up to Certified Wireless USB hubs such as those released by D-Link and IOGear. They will carry a Certified Wireless USB logo. In the interim, until peripherals catch up with the technology, they will need to be plugged into a wireless USB hub. This will allow the Dell and Lenovo laptops to communicate with a peripheral device such as a conventional printer plugged into the hub.
Sunday, 24 June 2007
This is a copy from my old blog.
While doing some background sstudy of Wireless USB i came acrosss interesting information. Apparently there are two different Wireless USB standards that are being developed and they are not compatible with each other. More information aas follows:
Wireless USB (also known as Cablefree USB)
* Supported by UWB forum (pioneered by Freescale semiconductor)
* Uses DS-UWB (direct sequence)
* It mimics USB 2.0 in its interfaces to host and peripheral devices, handling the wireless issues within device adapters.
* This approach of retaining the USB 2.0 protocol means that developers can quickly offer products that users can simply plug in without making any system changes.
* Existing USB drivers will work
* The current Freescale UWB chipset operates at 114Mbps with a likely throughput of 50Mbps
Certified Wireless USB
* Supported by WiMedia alliance and USB-IF (USB Implementers Forum)
* Uses OFDM-UWB
* Certified Wireless USB employs a new communications protocol, similar but not identical to USB, to address the wireless issues.
* The Certified Wireless approach, on the other hand, required the definition of a new specification. The initial specification, which its developers released in May 2005, received a supplement defining the association's methods in March 2006. The specifications are now under the control of the USB-IF.
* Will need new software and USB drivers
* They operate at 480Mbps like USB 2.0 with probably similar throughput (peak 320Mbps)