1. UNIVERSAL SERIAL BUS

2. Introduction
Universal Serial Bus (USB) is an industry standard
Developed that defines the cables, connectors and
communications protocols used in a bus for connection,
communication and power supply between computers and
electronic devices.

3. Versions of USB
• USB 1.0
• USB 2.0
• USB 3.0

4. Components of USB system
• USB host controller
• USB hub
• USB cable
• USB peripheral devices

5. USB host controller
• It is an interface that allows an enabled piece of hardware
to interact and communicate with a particular piece of
software.
• USB host controller is a card that easily installs into any
available slot in the motherboard.
• The back-facing plate of the controller provides two or
more USB ports.

6. USB hubs
• A USB hub is a device that expands a single USB port
into several so that there are more ports available to
connect devices to a host system
• A USB hub is a small, light unit with multiple ports for
plugging in USB devices.

7. PEHRIPHERAL DEVICES
• A peripheral is a device that is connected to a
host computer , but not part of it.
• It expands the host's capabilities but does not form part of
the core computer architecture.
• Ex.- Mouse,keyboard,Printer

8. USB TOPOLOGY
• USB elements connected via a tiered star topology.
• It supports up to 127 devices.

9. USB SYSTEM DESIGN

10. USB TRANSFER TYPES
• Isochronus transfer
• Interrupt transfer
• Bulk transfer

11. USB PACKETS
• USB data travels in packets
• Identified by “Packet ID” (PID)
• Token packet tells what’s coming
• Data packets deliver bytes
• Handshake packets report success or failure

12. Packet IDs(PIDS)
• TOKEN PACKETS
IN,OUT,SOF,SETUP
• DATA PACKETS
DATA0,DATA1(USB LS/FS)
DATA2,MDATA (USB HS)
• HANDSHAKE PACKETS
ACK,NAK,STALL (USB LS/FS)
NYET (USB HS)

13. USB DESCRIPTORS AND TYPES
• USB descriptors keep every information about the device.
• Descriptors typically reside in non-volatile data storage on the
device.
• Device descriptor
• Configuration descriptor
• Interface descriptor
• Endpoint descriptor

14. Descriptor types
• Device descriptor
• Configuration descriptor
• Interface descriptor

15. Device descriptor
• USB devices can only have one device descriptor.
• The device descriptor includes information such as what
USB revision the device complies to, the Product and
Vendor IDs.
• The number of possible configurations the device can
have.

16. Interface descriptor
• The interface descriptor could be seen as a header or
grouping of the endpoints into a functional group
performing a single feature of the device.
• There is no limitation as to having only one interface
enabled at a time.

17. USB CONNECTORS

18. PIN CONFIGURATION OF USB CONNECTORS

19. Difference between RS232 and USB
USB RS232
• RS232 has many pins and
• In usb only 4 to 5 pins
then it is again divided
are there.
into male and female
• USB ports are compact in pins.
size.
• RS232 is bulky and cover
• USB speed is now more space.
increase upto 5 gbps.
• RS232 spped
• USB supports plug and aproximately is 10 Mbps.
play feature.
• RS232 USES UART
COMMAND

20. ADVANTAGES OF USB
• Ease of use
• One interface for many devices
• Automatic configuration
• No user settings
• Speed
• Reliability
• Low cost
• Low power consumption

21. WIRELESS USB
• Wireless USB will build on the success of wired USB,
bringing USB technology into the wireless future.
• Wireless USB is a short-range, high-bandwidth wireless
radio communication protocol created by the wireless
USB promoter group.
• The basic transport mechanism for Wireless USB is the
ultra-wide band (UWB) radio platform.

22. Topology of WUSB

23. FEATURES OF ULTRA WIDE BAND
• Speed/Range-Scaleable speeds up over 1 Gbps
• Currently 480 Mbps at 3 m; 110 Mbps at 10 m
• Frequency: 3.1 GHz to 10.6 GHz
• Divided into 14 bands; 5 group
• Each band is 528 MHz wide
• OFDM symbols are interleaved across all bands
• Provides protection against multi-path / interference

24. USB Flash drives
• A Flash Drive is a type of portable USB drive that stores and
transfers data located on your computer working similar to
floppies in that information can be stored and written on them.
• This device enables you to read , write , copy, delete and move
data from USB flash drives to your hard disk drive and back
again.

25. ADVANTAGES OF WIRELESS USB
• It is the easy and secure from plugging it in / unplugging it
• You do not need to have a network cable between the device
and the network.
• You can connect fairly easily at home, work, multiple offices.
• You can move around or work at any available or suitable
location without having to be near a socket.

26. DISADVANTAGE OF WIRELESS USB
• Unless the security is not properly setup, both your laptop
or desktop and the network you are connecting to cannot
be compromised and your data can be accessed by
others.
• The hardware is small, it can get damaged, lost or stolen.
• Some older wireless networks can get very slow if there
are lots of people in the same area, all trying to use the
network (

27. APPLICATIONS OF WIRELESS USB
• Game consoles
• Digital cameras
• Digital camcorders
• DVD players
• Printers
• Scanners
• Projectors

28. USAGE APPLICATIONS OF WIRELESS AND WIRED USB

29. USAGE APPLICATIONS OF WIRELESS AND WIRED USB