2. Introduction of Devices ( Cables)
When 2 device communicate with each other,
they must agree with several points before
conversation (i.e.)
a) Whether I am going to use wire or not, If I
use wire how many wires it require
either1,2,8
b) What is the data rate to be sent at a time
3. IR
It was the first wireless technology which have been
introduced to communicate without wires.
The biggest drawback of IR is Line Of Sight
(LOS)Problem.
It can Communicate with lose Contact to each
other. It can communicate with only 2 systems at
a time.
4. Differences between IR and BT
IR BLUETOOTH
It uses Infra red light to
transmit data from one device
to another
It uses Radio Waved to transmit
data
Range is about < 3 m Range is about 10m
Data rate speed is about 4 Mbps Max Data rate speed is about 1
Mbps
Line of Sight Problem exists
here
No Line of Sight Problem
(LOS).
The devices must be a
stationary one
The devices can be a movable
one.
5. Definition
It is a wireless technology which is used for
exchanging data over small distance without
wires.
The name is borrowed by Harald Bluetooth a
king of Denmark
6. Characteristics of Bluetooth
It uses very low power (0.3 mA for standby
mode and 30 mA for data transmission) .
There is no LOS problem.
The range of Bluetooth devices is upto 10m.
7. Bluetooth Versions
Version
1.1
Data transmission speed is about 721 kbps.
Here PIN is needed to send the data
Version 2.1 Uses simple pairing scheme ( which does not
require any PIN to transfer data) to enhance
security features Data rate is about 3 mbps.
Version 3.0 Here data rate is about 24mbps
Version 4.0 The device will consume less power and provide
additional security features.
8. Pros of Bluetooth
1) It does not require Cables and wires
2) Power consumption is very low.
3) It is free to use, users need not to pay any
amount for using the devices.
4) No LOS problem.
9. Con of Bluetooth
1) Data Transfer speed is low when compared to
other Wireless devices.
11. Explanation of Architecture
It consists of a master device and upto 255 slaves
can exists but only 8 devices can be active at a
time.
Other devices are called Parked slaves (i.e.) Such
devices can’t communicate in this. This
architecture is known as Piconet.
The master can communicate with slaves, while
the slaves can’t communicate with each other.
13. Explanation of Scatternet
Piconets can be combined to form what is
called a scatternet. A secondary station in one
piconet can be the primary in another piconet.
This station can receive messages from the
primary in the first piconet (as a secondary)
and, acting as a primary, deliver them to
secondaries in the second piconet.
15. Explanation of Bluetooth Layers
1) Radio Layer -> It is just similar to Physical
Layer in OSI model. It mainly deals with
transmitter characteristics(i.e. Data Transfer
rate).
16. Explanation of Bluetooth Layers
2) Baseband Layer -> The role of Baseband Layer
is to perform Error correction and encryption
operations.
Legacy pairing: This is the only method
available in Bluetooth v2.0 and before. Each
device must enter a PIN code; pairing is only
successful if both devices enter the same PIN
code.
17. Explanation of Bluetooth Layers
Secure Simple Pairing (SSP) -> No user
interaction is required (i.e. PIN Number
Validation) however, a device may prompt the
user to confirm the pairing process. If both
devices have a display and at least one can
accept a binary Yes/No user input, they may
use Numeric Comparison.
18. Explanation of Bluetooth Layers
3) L2CAP -> It stands for Logical Link Control
Adaption Layer. It is responsible for Link
Control and setup.
It also provides reliable connection (i.e.) There
may be an acknowledgement that the
corresponding data has been sent or not.
20. Explanation of Bluetooth Layers
Access Codes -> This 72-bit field normally
contains synchronization bits and the
identifier of the primary to distinguish the
frame of one piconet from another. (i.e.
Device Name)
Header -> It contains the address of the device.
`
Payload -> Which contains the message or data .
21. How it works ?
When the Bluetooth is turned on it sends radio
waves to ask if there any devices are within
the range
22. Set Up Procedure
• Turn on Bluetooth
• Ensure the device is visible or not. ( If not give
a name to your device to specify the identity).
23. Xender
It is one of the Android App to share data
between 2 devices at a faster rate when
compared to Bluetooth.
This app supports android version of 2.2 and
above.
The data Transfer rate is about 7093 kbps.
24. Xender
There is no limitation of file formats you are
going to send.( It can be either video, audio).
No Wi-Fi, net connections is needed.
