USB vs. Fire Wire

8/8/2019 USB vs. Fire Wire

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USB vs. Fire wire


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USB(universal serial bus)

USB has the capability of

transferring 12 Mbps.

Supporting up to 127devices and only utilizing

one IRQ.

Devices can be up to 30

meters away from the

host.

Lets you attach anything

from mice to keyboards to

your computer. The operating system

supports USB.

USB is by far the easiest

way to connect any device

to your computer.


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FEATURES... USB devices are hot-

swappable,meaning you can

plug them into the bus and

unplug them at any time. A USB cable has two wires for

power(+5 volts and ground) and

a twisted pair of wires to carry

the data.

The computer can supply up to500 milliamps of power at 5

volts.


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FEATURES With USB 2., the bus has a maximum data rate of 480 megabits per

second.

Low-power devices can draw their power directly from the bus.

High-power devices have their own power supplies and draw minimal

power from the bus.

Hubs can have their own power supplies to provide power to devices

connected to the hub.

The computer acts as the host.


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The USB Proc

ess

When the host powers up, it queries all of the devices

connected to the bus and assigns each one an address. This

process is called enumeration- devices are alsoenumerated when they are connected to the bus. The host

also finds out from each device what type of data transfer it

wishes to perform.

There are 3 different types of data transfers


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Data Transfers

Interrupt- A device which will be sending very little data like amouse or keyboard, would choose the interrupt mode.

Bulk- A device which receives data in one big packet, like a printer,uses the bulk transfer mode. A block of data is sent to the printer andverified to make sure it is correct.

Isochronous- A streaming device, such as speakers, uses theisochronous mode. Data streams between the device and the host in

real-time, and there is no error correction. The host can also sendcommands or query parameters with control packets.


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Products that receive

power through USB port

Cameras

CD-Rom Drives

Converters

Joysticks

Keyboards

Printers

Microphone

Modem

Monitors

Mouse

Mp3 players

Network

Removable Media

Scanners

Speakers

TV Tuners


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USB Connectors

There are several types of USB connectors.

The original USB plugs and receptacles were

Standard-A and Standard-B.

Standard-A is most frequently seen on cables that are

permanently attached to a device.

Standard-B is mainly used for the device end of aremovable cable.

The Micro-USB connector is used to replace the

Mini-USB plugs.

Microsofts Xbox game console used USB 1.1

signaling in its controllers and memory cards, but

features proprietary connectors and ports.

There are at least 10 different types of non-standard

Mini-USB receptacles and jacks currently in use. USB-IF created the Micro series of receptacles and

jacks, to focus on one jack that delivers both power

and data.


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Power

The USB provides a 5V supply on a single wire from which connected USB devices may draw

power.

If a bus-powered hub is used, the other devices may only use a total of four units 400 mA of current.

This limits compliant bus-powered hubs to 4 ports.

The host operating system usually keeps track of the power requirements of the USB network andcould issue a warning when a certain segment requires more power than what is there.

On-the-Go and Battery Charging Specification both add new powering modes to USB.

The main charger shorts the D+ and D- pins together and will not send or receive any information on

those lines, which allows the creation of simple, high current chargers to be created.

The increased current will occur once the host/hub and devices both support the new charging

specification.

As of June 14, 2007, all new mobile phones applying for a license in China are required to use a USBport as a power port.

Many mobile companies are announcing that its members had agreed on micro-USB as the future

common connector for mobile devices.


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Pow

ered USB

Uses standard USB signaling with the addition of extra power lines.

It uses 4-additional pins to supply to supply power to other devices.

The wires and contacts on the USB portion have been upgraded to

support higher current.

This is commonly used in retail systems and provides enough power to

operate stationary barcode scanners, printers, pin pads, etc.

This standard was developed by IBM.

It is basically two connectors stacked so that the bottom connector

accepts a standard USB plug and the top connector takes a power

connector.


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FireWire FireWire is a method of transforming information between digital

devices.

It is very fast, the latest version achieves speeds up to 800 Mbps and is

expected to jump to an unbelievable 3.2 Gbps.

You can connect up to 63 devices with a FireWire bus.

Supported by both windows operating systems and Mac OS.

FireWire is plug-and-play, so when you connect a new firewire device

to your computer, the computer auto-detects it and asks what you wish

to do with it.

FireWire devices are hot-pluggable, which means they can be

connected and disconnected at any time, even with the power on.


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Specifications The original FireWire was faster

than USB when it came out.

Transfer rates of up to 400 Mbps.

The maximum distance betweendevices is 4.5 meters of cable

length.

Eventually, FireWire 800 replaced

USB 2.0 very easily.

FireWire 800 had a transfer rate of

up to 800 Mbps.

The maximum distance of cable

length between devices is 100

meters.


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IIDC

(Instrumentation & Industrial Digital Camera)

This is the FireWire data format standard for live

video.

This system was designed for machine vision systems. Also used for some computer application programs.

This is often confused with another system because

they both used FireWire; DV(Digital Video)


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Future Enhan

cemen

ts Besides the short term

life span of S3200 over

the beta connector, futurecreations of FireWire

should bring an increase

in speed to 6.4 Gbit/s,

use of single-mode fiber,and additional connectors

such as the smaller port.


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USB/FireWire Manufacturers

Dell-examples: IEEE 1394aFireWire Controller card forDell Workstations, OptiPlexGX280 Desktop, Dual PCIriser for Dell OptiPlex 745Desktop System.

ADC-examples: Campus-RSFLEX expansion module &CAFLEX Multi-Port Campus-

RS expansion module. Logitech

Kensington

Belkin Components

ADS Technologies

American Power Conversation


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Sources http://accessories.us.dell.com/sna/category.aspx?c=us&category_id=61

75&cs=04&l=en&s=bsd&~ck=anav&ST=usb%20hubs&dgc=ST&cid

=33011&lid=774566

http://en.wikipedia.org/wiki/USB#Types_of_USB_connector

http://en.wikipedia.org/wiki/FireWire

http://en.wikipedia.org/wiki/USB


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USB vs. Fire Wire

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