Build That Geek

USB Port Explanation

Everyone that has used a PC or laptop will have used this ports without themselves knowing.

The history of the USB port goes back to the period of 1990s where several connection interface exist such as serial port, parallel port, ps2, etc. With so many interfaces, a typical user will need different cables for each separate connection.

USB(Universal Serial Bus) was created to standardize all the different interfaces, hence the word “universal”

With the standardization of different interface, the USB port has more tasks to complete – to increase their transfer rate between the host and devices connected to it.

USB started off on specification USB1.0 in 1994, followed by USB1.1, and finally USB2.0 in 2000

The various transfer speed of the specification is as follows

USB1.0 – 1.5Mbit/s

USB1.1 – 12Mbit/s

USB2.0 – 480Mbit/s

As of writing, USB3.0 Specification was in the midst of discussion and the transfer speed is rumored to be at 5000Mbit/s!!

The increase in transfer speed was mainly meant for transferring of data between devices. As USB hard disk expands in capacity, and users are demanding for better video quality, naturally, video file sizes are increased. Thus the birth of USB3.0

The first commercial product released for USB flash drives, commonly known as thumbdrive, in 2000. Back then, flash storage was at a measly 128mb. At time of writing, 2009, 1.5TB (1,500GB or 1,500,000MB) already exists!

If we were to transfer a single file of 5Gb on usb1.1 specs, on theory, we will need 3333s, which will take around 55min!! and 83s on a USB2.0 Specs.

Over the years, different companies develop different interface for USB devices as well, which somehow defeats the purpose of standardizing a common interface. However, the problem of different interface was not as serious as it was back in 1990s.

USB cable was able to carry power and to power up devices such as thumbdrive, webcams, external hard disk, usb speakers, etc. However, power is capped at 5v, 100mA.

USB cables suffer from a “useful” distance. Meaning, the maximum length of a usb cable is capped at 5m. Should the length be longer, the efficiency dropped and data may be corrupted.

For PCs with limited USB ports, a hub, typically with 4 additional USB ports, may be purchased. This will indirectly increase 3 more USB ports on your computer. However, take note that the bandwidth and power of each port on the USB hub will be reduced, as all its bandwidth and power are sourced from a USB port.

Common problems faced from using a USB hub, slower transfer rate and the inability to power up external 2.5” hard disk as they require more power as compared to a usb webcam or usb speaker.

That is all to wrap up for the topic and history for USB. I hope that the above computer guide will assist you in having a further understanding of USB history.

For more information about computers, do visit S-Mall Computer Article Section.

If you are purchasing computers in Singapore, do drop by our website http://www.s-mall.com.sg

 

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HP Parallel Port Cable - 1 x Female Parallel - 1 x Parallel $29 HP Parallel Port Cable - 1 x Female Parallel - 1 x Parallel

1284-B - Parallel adapter - parallel $76.99 The parallel 1284-B interface card installs into the printer's internal port. It supports a parallel 1284-B compliant interface using a 36-pin D-shell female bidirectional connector.

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Lava Computer Parallel-PCI 1 Port Parallel Adapter $32.99 PCI Parallel Adapter PARALLEL-PCI http://www.lavalink.com The LAVA Parallel-PCI, when it came to market, was the first parallel PCI port card in the world. Fully PCI compliant, it takes advantage of the speed and easy configuration of the PCI bus. When it appeared, it almost tripled the speed benchmarks of ISA-bus parallel port cards, while offering greater flexibility for configuration. Users were no longer restricted to the three standard parallel port addresses: the Parallel-PCI would automatically select a free address and IRQ during installation, virtually eliminating user error and resource conflicts. PC Lifetime 1 x 25-pin DB-25 Parallel Plug-in Card Lava Computer MFG, Inc Parallel-PCI Parallel-PCI 1 Port Parallel Adapter Lava Computer

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Koutech IO-USP210 USB to Serial+Parallel Port Adapter $29.49 Type: USB to Serial+Parallel Features: Enable you to connect your serial & parallel devices to any PC, or laptop computer through USB 1.1 & USB 2.0 port Fast and easy installation One 9-pin serial port & one 25-pin parallel port connector; all in one USB connection cable only Supports RS-232 serial, and true bi-directional parallel interface USB Specification v.1.1 Parts: 3 years limited Labor: 3 years limited

Parallel Port Complete: Programming, Interfacing & Using the PC's Parallel Printer Port $26.05 This detailed guide for programmers, developers, and computer enthusiasts shows how to get the most from parallel port in any application or project. The Visual-Basic code and circuit designs include examples that use the new enhanced (EPP) and expanded (EPC) modes.

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Startech 2 Serial/1 Parallel Port Dual Voltage WHQL Adapter $69.44 Startech PCI2S1PDV 2 Serial/1 Parallel Port Dual Voltage WHQL Adapter

Startech 1 Port Parallel EPP/ECP CardBus Adapter $64.92 Startech CB1PECP 1 Port Parallel EPP/ECP CardBus Adapter

Cables Unlimited Unlimited - 1 Port DB25 Parallel PCI Adapter $31.05 Cables Unlimited IOC-1000 Unlimited - 1 Port DB25 Parallel PCI Adapter

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SocketSerial SPPXP-100 1 Port Parallel Adapter - 1 x 25-pin DB-25 Parallel $114.99 Quatech 1 Performance PCIe based EPP parallel port ExpressCard.

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SIngle DB25 Parallel Port PCI Card $19.99 This high performance EPP/ECP parallel card adds one IEEE 1284 port to your computer. With data transfer rates up to 2.7 Mbps this card is up to 3 times faster than a standard built-in parallel port.

1 Port Printer/ Parallel PCI Express Card $57.99 This easy to install and configure PCI Express card from Cables Unlimited adds a parallel port to any newer PC with an extra PCI Express slot.

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USB to Parallel Printer Adapter $10.99 The USB-Parallel printer cable allows your PC to print with parallel printer devices connected through the USB port.

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1 Port ExpressCard Laptop Parallel Adapter Card - SPP/EPP/ECP - Parallel adapter - ExpressCard/34 - parallel $64.99 This ExpressCard Parallel Adapter turns an ExpressCard slot into a Parallel port allowing you to connect parallel devices to a laptop computer. The card is PCI Express (x1) based ensuring faster data transfer rates between host and peripheral than ...

1 Port PCI Dual Voltage Parallel Adapter Card - Parallel adapter - PCI-X low profile - parallel $32.99 This PCI Dual Voltage EPP/ECP Parallel Adapter Card adds an IEEE 1284 port to your PC with support for data transfer speeds of up to 1.5 Mbps - up to 3 times faster than built-in parallel ports.A versatile solution the Parallel Adapter Card can be ...

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StarTech.com 1 Port Parallel EPP/ECP CardBus Adapter $52.99 CardBus Parallel Adapter Up to 1.50 Mbps Parallel Port CB1PECP http://www.startech.com This 1-port ECP/EPP parallel adapter is compatible with all 32-bit CardBus slots, providing a cost-effective way to connect parallel printers, scanners and more to a laptop computer. PC 1 x 25-pin DB-25 Female Parallel Plug-in Module StarTech.com 1 Port CardBus PCMCIA Parallel Laptop Adapter Card StarTech.com

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StarTech.com 2 Port PCI Parallel Adapter $45.99 PCI Parallel Adapter Plug and Play Printers Scanners CD-R/RWs Zip drives Memory Card Readers Compatible with older parallel peripherals Up to 1.50 Mbps Parallel Port PCI2PECP http://www.startech.com This high performance EPP/ECP parallel card can be installed in a computer PCI slot, to add two IEEE 1284 ports to your PC. Supporting data transfer speeds of up to 1.5 Mbps (up to 3 times faster than built-in parallel ports), installing the EPP/ECP parallel adapter card is easy, with support for Windows Vista, XP, ME, 2000, 98, 95, NT4, DOS and Linux. Plus, IRQ sharing and plug and play capabilities guarantee convenient, hassle-free connections to any parallel peripheral. A complete dual profile solution, this parallel adapter card provides both a standard bracket and a low profile bracket for adapting to slimline or small form factor system applications. The 2 Port EPP/ECP Parallel PCI card is backed by StarTech.com?s Lifetime Warranty and Free lifetime tech support. 1 EPP ECP SPP BPP Lifetime 2 x 25-pin DB-25 Female IEEE 1284 Parallel Plug-in Card IRQ sharing eliminates conflicts between multiple cards StarTech.com 2 Port PCI Parallel EPP/ECP Adapter Card IBM PC or Compatible Computer DOS Windows 95 Windows 98 Windows ME Windows 2000 Windows XP Windows NT 4.0 Linux An open PCI slot StarTech.com

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1284B Parallel EIO Card $95.99 Parallel port interface for compatible HP peripherals giving you the flexibility to continue to support parallel devices. The card fits easily into an open EIO slot of the peripheral.

Programming the Parallel Port $35.86 Why purchase expensive add-on cards or bus interfaces? Gadre teaches readers how to build a complete data acquisition system and such varied applications as a CCD camera controller, a photometer interface, and a wave form generator. (Computer Books)

Startech.com 1 Port Parallel ExpressCard Adapter Kit - Hardware Connectivity Kit $31.24 This ExpressCard (34mm) based Parallel Adapter Card provides a quick and easy way to connect EPP/ECP Parallel devices to a laptop computer using an available ExpressCard port. Providing data transfer rates of up to 1.5Mbps, the Parallel Adapter Card (EC1UP) offers ideal performance and superb value by interfacing older parallel devices (USB-based printing support only) with cutting edge laptop designs through an ExpressCardport, eliminating the expense of upgrading parallel peripherals for compatibility with computers that don't offer native parallel support.

Startech.com 1 Port Parallel ExpressCard Adapter Kit - Hardware Connectivity Kit $39.99 This ExpressCard (34mm) based Parallel Adapter Card provides a quick and easy way to connect EPP/ECP Parallel devices to a laptop computer using an available ExpressCard port. Providing data transfer rates of up to 1.5Mbps, the Parallel Adapter Card (EC1UP) offers ideal performance and superb value by interfacing older parallel devices (USB-based printing support only) with cutting edge laptop designs through an ExpressCardport, eliminating the expense of upgrading parallel peripherals for compatibility with computers that don't offer native parallel support.

25ft Standard Parallel Printer Cable $6.99 Designed for printers that are not compliant with the IEEE 1284 specification this Standard Parallel Printer Cable lets you print from a PC with a DB25 female parallel port to a parallel printer with a Centronics-36 female port.

USB to Parallel Printer Adapter - Parallel adapter - USB - parallel - black $23.99 This USB to Parallel Printer Adapter allows USB capable PCs to print to any standard parallel printer converting a USB port into a Centronics (male) connector for direct connection to a parallel printer. The USB interface provides a much faster data ...

USB Parallel Printer Adapter - Parallel adapter - USB - parallel $29.99 You just received a scanner for your birthday but your printer is utilizing your parallel port. With the Belkin USB Parallel Printer Adapter you can attach your printer to your USB port and make room for that scanner you always wanted. Belkin brings ...

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