Just wondering how many of us out there that know the potential for this technology, are "people" ready for it? If you're thinking Bluetooth has something to do with the cranberry lollipop that you're sucking on, don't bother.
BLuetooth? What is bluetooth?
- Thread starter sillymofo
- Start date
its something that was supposed to save the world a few years ago, or thats the feeling I got from all the hype
Same thing, different provider(s) for the most part.
Love the phone. Lightyears better than the POS T720 I had before it.
iamme
Lifer
- Jul 21, 2001
- 21,058
- 3
- 0
It's suppose to be a universal "wire replacement" technology, but there are different software versions
EDIT: Don't confuse Bluetooth as another "wireless" technology or standard, but think of it as a "wirereplacement" technology. You don't need a server, IP, MAC, or any of that craps. The device communicate with each other directly through serial communication "wirelessly", by pairing.
I heard bluetooth is friggin slow ... somewhere like 720kbps ... it was supposed to save the world in that it was wireless, however it did not have enough bandwidth to support all the devices that we use today and at a fast enough rate to operate effectively (ie some photo prints are in the megabytes (not megabits) so it would take forever to wirelessly send that).
iamme
Lifer
- Jul 21, 2001
- 21,058
- 3
- 0
Originally posted by: cr4zymofo
It's suppose to be a universal "wire replacement" technology, but there are different software versions. Basically, SONY (not IBM) developed the technology for all Bluetooth enable devices to communicate with each other wirelessly without wires. Just think "telephathically", in a sense.
well, as "telepathic" as your cordless phone and WiFi router
from my impressions, one day you won't need to plug in your keyboard, mouse, printer, scanner, and other peripherals. Your desktop will have a Bluetooth receiver and each peripheral will communicate wirelessly.
Originally posted by: iamme
Originally posted by: cr4zymofo
It's suppose to be a universal "wire replacement" technology, but there are different software versions. Basically, SONY (not IBM) developed the technology for all Bluetooth enable devices to communicate with each other wirelessly without wires. Just think "telephathically", in a sense.
well, as "telepathic" as your cordless phone and WiFi router
from my impressions, one day you won't need to plug in your keyboard, mouse, printer, scanner, and other peripherals. Your desktop will have a Bluetooth receiver and each peripheral will communicate wirelessly.
Great, just what I need someone sniffing my keystrokes out of the air.
bluetooth is a cable replacement technology, where 802.11x is a wireless ethernet technology.
Bluetooth is for printers, wireless headsets, short personal networking (laptops, pdas, cellphones, etc) ... it just replaces short cable connections that would have had to exist to get these devices to talk to one another. I believe it has the ideal of "personal area networking" ... aka a 30 feet or so.
Bluetooth is for printers, wireless headsets, short personal networking (laptops, pdas, cellphones, etc) ... it just replaces short cable connections that would have had to exist to get these devices to talk to one another. I believe it has the ideal of "personal area networking" ... aka a 30 feet or so.
The reason I ask is because the company I work for pioneers in providing Bluetooth Technology to North America. You guys will see us soon, I'm suppose to see if people actually know what Bluetooth is, and 2 years after it's debut, most people still don't know what it is (people on AT for that matter). But with the influx of affordable Bluetooth cell phones and PDAs, we're hoping that the public will be more concious toward Bluetooth and what it can do.
AgaBoogaBoo
Lifer
- Feb 16, 2003
- 26,108
- 5
- 81
Just because it *can* do something do people really *need* it to do it?
Personally, I'd never use any of this stuff. I don't even have a cell phone or PDA right now, let alone need any connectivity between them.
There are three different classification to Bluetooth, Class 1, 2, and 3. With ranges from 10, 20 and 100 ft respectively. The idea is so that all of your peripherals, i.e. camera, phones, PDAs, cell phones, computers, can directly communicate with each other without the use of cable. So you are right.
Originally posted by: Bootprint
Originally posted by: iamme
Originally posted by: cr4zymofo
It's suppose to be a universal "wire replacement" technology, but there are different software versions. Basically, SONY (not IBM) developed the technology for all Bluetooth enable devices to communicate with each other wirelessly without wires. Just think "telephathically", in a sense.
well, as "telepathic" as your cordless phone and WiFi router
from my impressions, one day you won't need to plug in your keyboard, mouse, printer, scanner, and other peripherals. Your desktop will have a Bluetooth receiver and each peripheral will communicate wirelessly.
Great, just what I need someone sniffing my keystrokes out of the air.
I got the impression that the connections in bluetooth were secure. The items are paired together between devices, only those devices can recieve the signal? Bluetooth chipsets need to be set to discoverable mode in order to be seen without pairing. Otherwise the devices must be paired.
Even the regular cordless keyboards and mice have secure connections (although they need to be established).
Bluetooth does have its place, in smaller areas, not good for an ethernet replacement, but as its definition, a personal area network. Your laptop, cell, pda, printer, and PC(or MAC) etc could communicate without wires, which is very nice.
So was I right about the speed? and why it's not that popular, atleast in class 1? How fast is class 2 and 3?
personally i am excited for when it does get more mature... i would really like to be able to sync contacts and calendar stuff between my computer, cell phone, and ipaq quickly and easily.
The speed is as fast as USB 1.1, the classes don't deal with speed, but rather how far a device can be away from each other. Think of Bluetooth applications in a corporate environtment.
There are alot of "almost right" comments in this thread. Let me try to clear a few up.
What is Bluetooth?
Bluetooth is a wireless PAN (personal area network) protocol which operates in the 2.4GHz (ISM) band. The same band as 802.11b/g, many cordless phones, and a few other consumer gadgets. Bluetooth uses a spread-spectrum technology called FHSS (frequency hopping). There are 79 1MHz channels (2.402GHZ - 2.480GHz). The radio hops from channel to channel in a pseudo-random order (defined by the connection master device) at a rate of 1600 hops per second. Try to use a sniffer on that
What does it do?
The common verbage for Bluetooth is a "cable replacement" technology. That's pretty close, but you need to clarify what cables you want replaced .
There are a few main usage models for Bluetooth. These are referred to as "profiles" as they define how the connection between 2 devices behaves in the protocol stack.
1) Audio (handsfree, headset, cordless phone) - this type of connection will send mono voice quality audio in full-duplex between up to 3 devices.
Some typical applications here are
- Bluetooth headset for your cellphone (these are addicting)
- Handsfree car kits (that activate once your phone is in range and route the audio through the auto's handfree voice system)
- Cordless telephony (this isn't quite available yet, but you will soon be able to use your Bluetooth enabled phone as a cordless phone in your home and handoff to your carrier when you leave the house).
2) Data (serial port / USB port) - there are several profiles which basically use a serial port connection with a twist. This would be for sync'ing PDA's, transferring files amongst files, games, windows networking, etc.
Some typical applications here are
- PDA's can use Bluetooth to automatically sync with your desktop PC.
- Wireless keyboards and mice for Bluetooth enabled desktops/laptops.
- Printers
- Basic networking between portable devices (laptops, pda's etc)
There are many more applications, but those are the main ones.
How far away will it work?
That's a trick question. As with anything RF, YMMV. Some applications will have better radios/antennas than others.
There are 3 "classes" for the power of the Bluetooth radio transmitter. Class 1,2,3
Class 1 is a high power device (0dBm to 20dBm with power control). If two Class 1 devices are connected, range can be equal to or better than even the best WLAN connections.
Class 2 is what most typical consumer devices will be (-6dBm to +4dBm). Range can be expected to be between 10 to 20 meters.
Class 3 is a low power implementation ( > 0dBm). Range will be a couple of meters.
The throughput is only 1Mbps / 720kbps / too slow!!!
The symbol rate for Bluetooth is 1Mbps, just like the symbol rate for 802.11b is 11Mbps (max or 5.5,2,1). That doesn't mean you can use all 11Mbps. With a windows TCP/IP stack, you can generally expect about half that in TCP/IP throughput.
Bluetooth data connections are asymmetric, the max throughput depends on the connection (packet) type.
Here is a pretty good summary of the speeds in various modes. In summary, the max on-way throughput is 723.2kbps but when you get down to a file transfer or a practical test, you will see less than half that.
That is a typical "reason" why many people think Bluetooth "sucks". The reality is that it's a benchmark people are familiar with missapplied to Bluetooth. Who cares how fast Bluetooth does TCP/IP when just about every single laptop or PC which will have it embedded will also have WLAN. If you have WLAN, why the hell are you sending files with Bluetooth.
Bluetooth throughput rate is adequate for the things it does well. Keyboards, mice, voice-quality audio, sync-ing. As Bluetooth matures, the spec will provision for faster data rates, just like 802.11b allowed for the faster 5.5Mbps and 11Mbps rates from 802.11.
So, you admit WLAN is faster and has better range. Then why even bother with Bluetooth?
Cost, current consumption, size, and MIPS requirements from host.
WLAN is (today) cost prohibitive for devices such as keyboards, mice, headsets, printers, etc.
WLAN consumes about 10x the current consumption of Bluetooth. Check out the new Apple Bluetooth keyboards and mice. The battery life is 6 months to a year on those.
WLAN chipsets are big. Can't fit a 30mm x 40mm card behind your ear. Complete Bluetooth radio modules are down to 7mmx7mm in size (or smaller).
WLAN stacks can take a bit more processing power, which make them impractical for standalone devices like mice, keyboards, headsets.
That's enough for now, hope my typo's weren't too bad. I'll add a few more items onto this if anyone cares. post a couple questions and I'll try my best to answer them.
What is Bluetooth?
Bluetooth is a wireless PAN (personal area network) protocol which operates in the 2.4GHz (ISM) band. The same band as 802.11b/g, many cordless phones, and a few other consumer gadgets. Bluetooth uses a spread-spectrum technology called FHSS (frequency hopping). There are 79 1MHz channels (2.402GHZ - 2.480GHz). The radio hops from channel to channel in a pseudo-random order (defined by the connection master device) at a rate of 1600 hops per second. Try to use a sniffer on that
What does it do?
The common verbage for Bluetooth is a "cable replacement" technology. That's pretty close, but you need to clarify what cables you want replaced
.There are a few main usage models for Bluetooth. These are referred to as "profiles" as they define how the connection between 2 devices behaves in the protocol stack.
1) Audio (handsfree, headset, cordless phone) - this type of connection will send mono voice quality audio in full-duplex between up to 3 devices.
Some typical applications here are
- Bluetooth headset for your cellphone (these are addicting)
- Handsfree car kits (that activate once your phone is in range and route the audio through the auto's handfree voice system)
- Cordless telephony (this isn't quite available yet, but you will soon be able to use your Bluetooth enabled phone as a cordless phone in your home and handoff to your carrier when you leave the house).
2) Data (serial port / USB port) - there are several profiles which basically use a serial port connection with a twist. This would be for sync'ing PDA's, transferring files amongst files, games, windows networking, etc.
Some typical applications here are
- PDA's can use Bluetooth to automatically sync with your desktop PC.
- Wireless keyboards and mice for Bluetooth enabled desktops/laptops.
- Printers
- Basic networking between portable devices (laptops, pda's etc)
There are many more applications, but those are the main ones.
How far away will it work?
That's a trick question. As with anything RF, YMMV. Some applications will have better radios/antennas than others.
There are 3 "classes" for the power of the Bluetooth radio transmitter. Class 1,2,3
Class 1 is a high power device (0dBm to 20dBm with power control). If two Class 1 devices are connected, range can be equal to or better than even the best WLAN connections.
Class 2 is what most typical consumer devices will be (-6dBm to +4dBm). Range can be expected to be between 10 to 20 meters.
Class 3 is a low power implementation ( > 0dBm). Range will be a couple of meters.
The throughput is only 1Mbps / 720kbps / too slow!!!
The symbol rate for Bluetooth is 1Mbps, just like the symbol rate for 802.11b is 11Mbps (max or 5.5,2,1). That doesn't mean you can use all 11Mbps. With a windows TCP/IP stack, you can generally expect about half that in TCP/IP throughput.
Bluetooth data connections are asymmetric, the max throughput depends on the connection (packet) type.
Here is a pretty good summary of the speeds in various modes. In summary, the max on-way throughput is 723.2kbps but when you get down to a file transfer or a practical test, you will see less than half that.
That is a typical "reason" why many people think Bluetooth "sucks". The reality is that it's a benchmark people are familiar with missapplied to Bluetooth. Who cares how fast Bluetooth does TCP/IP when just about every single laptop or PC which will have it embedded will also have WLAN. If you have WLAN, why the hell are you sending files with Bluetooth.
Bluetooth throughput rate is adequate for the things it does well. Keyboards, mice, voice-quality audio, sync-ing. As Bluetooth matures, the spec will provision for faster data rates, just like 802.11b allowed for the faster 5.5Mbps and 11Mbps rates from 802.11.
So, you admit WLAN is faster and has better range. Then why even bother with Bluetooth?
Cost, current consumption, size, and MIPS requirements from host.
WLAN is (today) cost prohibitive for devices such as keyboards, mice, headsets, printers, etc.
WLAN consumes about 10x the current consumption of Bluetooth. Check out the new Apple Bluetooth keyboards and mice. The battery life is 6 months to a year on those.
WLAN chipsets are big. Can't fit a 30mm x 40mm card behind your ear. Complete Bluetooth radio modules are down to 7mmx7mm in size (or smaller).
WLAN stacks can take a bit more processing power, which make them impractical for standalone devices like mice, keyboards, headsets.
That's enough for now, hope my typo's weren't too bad. I'll add a few more items onto this if anyone cares. post a couple questions and I'll try my best to answer them.
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