|Wireless remote data
Technologies and sample systems that gather sensor data across distances, usually via radio links. This includes general telemetry and SCADA (supervisory control and data acquisition), especially for gathering data about wildlife, natural resources, and distributed energy systems.
Ken Novak's Weblog
Saturday, October 04, 2003
ZigBee Standard Approved By IEEE: "The ZigBee standard, now officially known as 802.15.4, specifies the physical and media-access control (MAC) layers for the network, which can transfer data at rates up to 250 Kbits per second. The specification defines three throughput levels: 250 Kbits/s at 2.4 GHz, using 10 channels; 40 Kbits/s at 915-MHz, using 6 channels; and 20 Kbits/s at 868 MHz using a single channel. The technology can tranfer data at ranges up to 75 meters, depending on the power used and the transmission environment." 11:56:39 PM
RFID Journal - Peer-to-Peer: RFID's Killer App?: "A small Finnish company has taken a novel approach to solving that problem. Stockway has developed a peer-to-peer network that enables companies to share real-time data about products, regardless of the kind of RFID tag used on them. "We donít track information as such, we track where information can be found," says Lion Benjamins, Stockway's marketing director. .. Stockway's system doesn't create a centralized directory where people can go to find out where files are stored. Instead, Stockway makes the product the center of the system. When a tag is scanned with an WWAI-enabled reader, it lets users know which private network within the system is being used and where distributed information about the product is stored. ..
Another advantage is the system can use any kind of RFID tag or even bar codes. It doesnít solve the problem of needing standardized tags because business partners sharing information need to be able to scan the same tag. But partners could use the software to begin sharing data today with existing tags and readers, while waiting for their industry to agree on a standard tag. .. The system will have to compete with the Auto-ID Center's EPC Network, which also aims to use the Internet to enable companies to share data, though in a more centralized way. " 11:21:05 PM
Followit GPS+GSM: "With help from a cell phone or Internet can you position your object. Taxi companies, transport companies, car rent and even insurance companies can use the transponder in a wide range. .. Telia, a Swedish phone company, think that more than half of the mobile phone traffic is going to be computer traffic." It's called "matchbox sized", but looks about the same size as a cell phone. Another story : "Called Followit, the £700 device was invented by Olaf Lundberg, a Swede who lost his dog while moose hunting. Mr Lundberg's brainwave was to find a way of squeezing the workings of a GPS satellite navigation receiver and a mobile phone with a battery and two aerials into a box that he could strap to his dog's collar... "At first he sold it through hunting magazines, but then he found it was being used by truck companies to monitor the movement of their drivers through Sweden," .. In a demonstration seen by The Daily Telegraph, the device tracked the position of a car to the street in Winchester where the car was parked, even giving details of the nearest house number. Followit is now being sold to parents who want to keep tabs on their children, pet owners, private investigators, car hire firms, yacht owners, haulage companies, and travellers concerned about losing their luggage. It is also being offered to lone workers, such as community nurses, who can use its panic button if they are attacked." 11:08:54 PM
Back to the Future: New Wi-Fi Bridges Use 1999 Standard [Aug. 28, 2003]
: Technical description of WDS bridging that is simple and effective. Summary
from the author: "Apple and Buffalo, to name two, allow their access points to work as APs and bridges simultaneously, which can let you create a cloud of access instead of a little pool. It also reduces costs. In a shocking discovery, which I write about in this article, you can use Buffalo and Apple equipment together in WDS mode. Buffalo's roughly $100 access point (WLA-G54) pairs with Apple's $200-$250 AirPort Extreme Base Station, which has all the gateway features you need." 10:48:47 PM