Usb and Fire Wire

8/8/2019 Usb and Fire Wire

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USB

Universal Serial Bus


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Most popular Serial Peripheral bus

WWW.USB.ORG


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SERIAL

Bit after bit after bit instead of

several bits at once

Referenced as Mbps (why?)


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Universal SERIAL Bus

Anything to do with serial transmission was

traditionally difficult to set up

because of start, stop and handshaking


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Hot Swappable

USB is hot swappable or hot pluggable

------ PnP = Plug and Play

You can connect it without opening the

machine


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How ?

A USB Host Controller should be included in

the chipset

The USB host controller allows for the use of

just one IRQ


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USB 1.0

Low Speed

Announced November 1995

Released January 1996

1.5 Mbps


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USB 1.1

Full Speed

December 1998

Adopted by Windows 98

12 Mbps


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USB 2.0

High Speed

2000

480Mbps


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Wireless USB

2005


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USB 3.0

Superspeed

4.8 Gbps to 5 Gbps approx

mid-2008 announcement, but not yet

globally available


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USB Speeds

Superspeed 4.8Gbps to approx 5Gbps

High Speed - 480Mbps Full Speed - 12Mbps

Low Speed - 1.5Mbps


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USB Connectors

Type A

Type B

Mini Type A

Mini Type B

Micro USB (Jan 2007)


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USB Type A

Type A sockets will typically be on hosts and

hubs


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Type Aor Series A

Plug &R

eceptacle


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USB Type B Plug and

Receptacle

Type B plugs are on devices.


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Mini A and Mini B


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Micro USB

Micro USB Vs Mini USB on new RAZR2 cell phoner released May

2007


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USB Hub


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First computer tooffer USB

as standard ?

Bondi Blue iMac


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Connector problems ?


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Max length of a USB

Cable ?

5 Meters forHi-speed

USB ( 16 feet & 5 inches)

3 Meters forFull-Speed

USB (9 feet & 10 inches)


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Feet from meters ?

Multiply by approx 3.3


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Does your system support USB ?

Which one ?

Hi-Speed USB ?

Open Device Manager & expand theUniversal Serial Bus section.

=> There should be an "Enhanced" USBhost controller present.


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USB Driver updates ?

Keep current with yourOS

Go toTOUCHSTONE software and use the free

scan


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Windows Support for USB

Windows 95 OSR 2.1 was the first Windows OS

to support USB

Windows 98, 2K and XP support USB

Windows XP supports high speed USB with a

service pack

Windows NT never supported USB


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For USB to work

A motherboard or expansion card that

supports USB

An OS that supports USB

A USB device

The USB devices drivers


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Firewire

First introduced by Apple Computer

Mid 1980s Apple engineers developed a

method of transferring data between the hard

drives in a Mac they called it firewire.


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Apple brought Firewire to the IEEE

IEEE released it as standard IEEE 1394 in

December 1995


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Some differences between Firewire

and USB?

Firewire started off at speeds of 100Mbps

+.

Firewire was n

ot intended f

or sl

owerperipherals like mice and keyboards

Firewire can c

onnect up t

o63 devices indaisy chain, USB can connect up to 127

devices in daisy chain


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Similarities

Both are Serial bus standards

Both are hot-swappable / hot-pluggable


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Firewire Standards

1394a : also known as Firewire 400

Supports speeds of up to400Mbps

1394b : also known as Firewire 800

Supports speeds of up to 800Mbps

A newerFireWire standard that supports data

transmission at up to 3.2 Gbps is now being developed.


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IEEE 1394a

Firewire (Apple name)

i.Link (Sony name)

Lynx


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Symbol


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How do you know if

Firewire is supp

orted byyour motherboard ?

Open Device Manager and check for the 1394 BusController as an installed device

None present ?

- Expansion Card


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NoFirewire Ports ?

Install an adapter

card


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Firewire Connectors ?

1394a : 4 pin and 6pin

1394b : 9 pin

Cables and Connectors


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Firewire Max Cable Length

Maximum cable length device to

device for 139

4a (

Firewire

400) is4.5-meters (14.85ft).

1

0meter (32ft) cable with ahub/repeater extends FireWire over

longer distances.


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Firewire Max Cable Length

Maximum cable length device todevice for 1394b (Firewire 800) is100Meters (328 feet)


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Assignment

Use this link : USB Vs Firewire

.. to describe the differences between USBand Firewire


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3 Related Terms

Asynchronous

Synchronous

Isochronous


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Synchronous

Happens on a clock signal

Happens after a definite time quantum


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Asynchronous

happens at irregular intervals, without the

use of a clock signal


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Examples of synchronous and

asynchronous communications

Telephone conversation asynchronous

Transmission of files could be

asynchro

nous

or synchr

on

ous

Transmission of a definite preset amount

of data at a time - Synchronous


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Key

Synchronous transmission is rigid,

asynchronous transmission is flexible


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Isochronous

Does not operate independently of time

like asynchronous communictaions, so

needs time coordination - but is not as

rigid as synchronous communications

Data is transferred consistently and at a

steady rate, but in step with the receivingdevices ability to accept the data.


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Example of isochronous

communications

A picture going from a peripheral device

like a camera, to a computer

A video stream going from a camcorder to

a computer


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What type of interface is used for

this ?

USB

Firewire

Both use isochronous transfer methods

Usb and Fire Wire

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