sesion 9 - bluetooth
Post on 25-Sep-2015
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Lic. Jorge Guerra Guerra
- Connects a wide range of computing and telecommunication devicesExpand communication capabilitiesDevices can communicate with each other with wireless connectivity
- Car manufactures Industry E-Mail / Internet / Intranet AccessHeadsetsBluetooth will facilitate Local Area Networks
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PDA
Cell Phone
Cordless Phone
Base Station
Inkjet
Printer
Scanner
Home Audio System
Computer
Digital Camera
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Source: http//:www.motorola.com
In the Office ...
In the house
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Home Security
On the Road
Source: http//:www.motorola.com
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On your Car
Source: http//:www.motorola.com
- Bluetooth is a standard for tiny, radio frequency chips that
can be plugged into your devices The information is then
transmitted to your device These chips were designed to take all of
the information that your wires normally send, and transmit it at a
special frequency to something called a receiver Bluetooth chip.
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RF
Baseband
Controller
Link
Manager
Bluetooth Chip
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- Things that you must have:Transceivers and Receivers that can
send and receive data because they use Radio Waves.MAC Address
(Physical Address)
Burnt on the NIC card by the manufacturer.
PIN NumberTo identify the user using the device.
A PiconetA FHHS protocol - A Piconet session is a communication link that must be created between devices for devices to communicate with each other. This is done when the MAC address and the PIN number match.
- If two devices come onto contact with each other( 32 feet) the user will be prompted to initiate a communication sessionUsers then can either deny or accept the request to initiate a sessionOnly devices approved by the user can take part in the sessionData will appear as noise to unauthorized devices(A great security feature).
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It comprises of a base band processor, a radio and an antenna . The base-band processor converts the data into signals, the antenna of another blue tooth device, within at least 30 feet distance, receives a transmitted signal in the air.
It uses a frequency hopping spread spectrum technique (FHSS) - which is one of two basic modulation techniques used in spread spectrum signal transmission. Frequencies are switched repeatedly during radio transmission to help reduce unlawful access or other means of telecommunications to cross paths and cause interruption
What is Bluetooth Technology:
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- Bluetooth devices use a protocol called (FHHS) Frequency-Hopping Spread Spectrum .Uses packet-switching to send data.Bluetooth sends packets of data on a range of frequencies.In each session one device is a master and the others are slaves.The master device decides at which frequency data will travel.
- Transceivers hop among 79 different frequencies in the 2.4 GHz baud at a rate of 1600 frequency hops per second.The master device tells the slaves at what frequency data will be sent.This technique allows devices to communicate with each other more securely.
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Source: http://www.xircom.com
- Has been set aside by the ISM( industrial ,scientific and
medical ) for exclusive use of Bluetooth wireless products
Communicates on the 2.45 GHz frequency
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- In this technique, a device will use 79 individual, randomly
chosen frequencies within a designated range Transmitters change
frequency 1600 times a second
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- ModesSecurity Mode 1
No Security
Security Mode 2Service Level Enforced Security
Implemented after channel is established
Security Mode 3Link Level Enforced Security
Implemented before channel is established
- TrustedNo RestrictionsUntrustedRestrictions, Access is limited
- Authorization and AuthenticationAuthentication OnlyOpen to all Devices
- Bluetooth Device AddressPrivate Link KeyPrivate Encryption KeyRandom Number
- Not enough for confidential and top secret information now but . . . Security will ImproveImprove exisiting securityImplement new security
- There are two technologies that have been developed as wireless
cable replacements: Infrared (IRDA) and radio (Bluetooth).
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- Intended for point to point linksLimited to line of sighthave a
narrow angle (30 degree cone),Low penetration powerDistance covered
is low(1 meter approx)have a throughput of 9600 bps to 4 Mbps IrDA
has proven to be a popular technology with compliant ports
currently available in an array of devices including: embedded
devices, phones, modems, computers (PCs) and laptops, PDAs,
printers, and other computer peripherals
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- BluetoothInfraredConnection TypeSpread SpectrumInfrared, narrow
beamSpectrum2.4GHz Optical 850 nano metersData
Rate1Mbps16MbpsRange30 Feet3 FeetSupported DevicesUpto 82
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- Voice Channels31Data Security8-128bit KeyNo special
securityAddressing48 bit MAC32 bit ID
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HC - 05
HC - 06
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Conectividad
HC05 pinMbed pin
1 - Tx P10 - Rx
2 - Rx P9 - Tx
12 - 3.3VVout - 3.3V
13 - GNDGND
31 - PIO8--
32 - PIO9--
34 - PIO11GND or 3.3V
PIO8 is used to control LED indicating the status. It will blink after power on.PIO9 is used to control LED indicating paring. It will be steady on when paring is successful.PIO11 is used to set this two mode: AT command mode (if the pin is connect to 3.3V) or Automatic binding transparent data mode (if the pin is connect to GND). The AT command mode is used to configure some characteristics of the device (for example the Master, Slave or Loopback modes). - Automatic synchronization between mobile and stationary devicesConnecting mobile users to the internet using bluetooth-enabled wire-bound connection portsDynamic creation of private networks
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10.psd
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