What's the difference between a static data member and a regular data member?

Whats the difference between Blue Tooth & Data cable?

• I mean Data cable is to upload, download from Mobile (Cell) to the PC, (net), so what does Bluetooth do & has what Data cable aint got or does?

• Answer:

  Both of these technologies are wireless networking systems, but they have very different aims and uses. Bluetooth is a PAN technology - Personal Area Networking. It is designed as a short-range (10 meters maximum) connection between devices that replaces cables or infrared. So, for example one common scenario is to want to connect your Palm handheld to your mobile phone. Traditionally you either carry a cable around and plug it between the two, or you carefully line them up and use infrared. If you have a Bluetooth phone and a Bluetooth add-on for you Palm, however, the connection between the two is automatically established whenever Palm and phone are within 10 metres of each other. Currently you can buy handhelds, phones, printers and PCs with Bluetooth built in or available as an add-on. Eventually the manufacturers intend Bluetooth to be very cheap and everywhere, so all your devices can seamlessly connect together. They envisage TVs and regular telephones and fridges all having Bluetooth built-in. A recent development is the popularity of Bluetooth versions of the Wireless Access Points more typically associated with 802.11. These devices plug into a Local Area Network and allow Bluetooth enabled PCs or PDAs to connect to that network. Wile these devices are clearly not as good as 802.11b WAPs since they are slower in speed and have shorter range, if you have for example a TT with bluetooth already built in, then this is a cheaper solution than an 802.11 WAP and an 802.11 card for the TT. There are software tools available, by the way, to allow a PC with a cheap USB bluetooth adapter fitted to act as a BT WAP. See http://www.mochasoft.dk/palm.html#palmppp for a starting point. Bluetooth runs at about 64Kb per second for a two-way connection. There are various mechanisms built in to identify devices to each other (so you can stop my palm connecting to your phone as I pass by) and to ensure that if you have a lot of bluetooth devices they don't interfere. 802.11b is a LAN technology - Local Area Networking. This takes the well understood and popular Ethernet networking technology used to connect computers together and allows a device to be connected to an Ethernet LAN without a cable. As well as the adaptor for your handheld you need a base station 802.11b has a longer range (76-300 metres depending on how much stuff is between you and the base station) and is faster (1-11 Mbits per second, depending again on signal strength). Typically 802.11b is used where you already have an ethernet based network, usually with an internet conenction, and wish to attach devices to that network without cables. It is popular in businesses and is begining to become popular in hi-tech homes. A typical home scenario has a user with a broadband connection and a small LAN at home. They add a base station to their network, attach an 802.11b adaptor to their handheld, and then can sit in the garden surfing the web using the broadband connection in the house. (This is the polite scenario; the ruder one has the user sitting in the toilet ;)) 802.11b is sometimes called WiFi or Airport. Which one is right for me? The best way to look at it is that Bluetooth is for when you want to connect your Palm to other devices, like a phone or a PC, without using serial cables or IR. 802.11b is for when you want to connect your Palm to an Ethernet network, without using an Ethernet cradle. Can I buy these now? Yes, there are various sleds for Palm handhelds. Palm are also very close to releasing a Bluetooth adaptor that fits the SD/IO slot on the modern Palms. What's with these strange names? Harald Bluetooth was king of Denmark about 1000 years ago. 802.11b is named after the IEEE meeting in February 1980 when the Ethernet standard was published; part 11 of the standard is about wireless Ethernet; this is the second try at doing it, hence the b. Is this all the wireless I can do with my Palm? No, another broad category of wireless connectivity is using the data services of the mobile phone networks. (In our scenario above, one of the main reasons for connecting Palm and phone via bluetooth might be to use the phone to make a wirelss data call). We'll have to write another FAQ about that one, and since I only know about the GSM networks we use in Europe, I'll only write half of that one! Also of course the VII and i705 have wireless capability built-in. Declaration of an interest I should point out that some of the products made by the company I work for have Bluetooth or 802.11b capabilities built in. But I'm not a salesman, so it should be OK. :)