pctechguide.com

  • Home
  • Guides
  • Tutorials
  • Articles
  • Reviews
  • Glossary
  • Contact

USB On-The-Go – USB technology for PDAs and mobile phones

The recent explosion in the number of digital electronics devices on the market has fuelled the need for an industry standard method of interconnecting such devices and peripherals such as printers. The dozens of connectivity methods used by mobile product manufacturers – including proprietary docks, dongles, slots, connectors and the various different memory card technologies – bears witness to this need.

The market penetration of USB – by early 2001 there were over 1.1 billion USB-enabled PCs, peripherals and consumer electronics devices in the worldwide customer base – makes it a natural candidate for mobile point-to-point connectivity. However, its master-slave protocol – which relies on the intelligence of the host – is a major disadvantage of USB. Implementation of the entire USB host on portable electronics devices is simply not feasible. Not only will a standard USB host significantly cripple the battery life of a low-powered device, the connectors are also too large for the form factor of these miniature devices.

To address the problem, several mobile phone, PDA and mobile product manufacturers have collaborated to define a new supplement to USB 2.0 specification, called USB On-The-Go (OTG). Finalised in December 2001, the new standard defines new mini connectors, negotiation rules and power requirements used in both host and peripheral. The specification also calls for a new type of device called dual-role peripheral, capable of acting as either a host or peripheral, depending on how users connect the cable to its unique mini-AB receptacle. When connected to the mini-A plug, the dual-role device behaves as a host; when the mini-B plug is connected instead, the device acts as a peripheral. The OTG peripheral can also determine the power consumed the by host during a connection in order to preserve battery power.

To encourage adoption, and to help consumers identify peripherals able to connect to their dual-role devices, the USB Promoter Group requires that all OTG dual-role devices come with a Targeted Peripheral List of supported hardware. Eventually, it is planned for USB OTG dual-role devices to be able to support a large class of peripherals via a universal driver.

On the face of it, Bluetooth – the wireless technology designed from ground up to allow interconnection of consumer electronics devices – might appear to be a competitor to USB OTG. In fact, the two technologies are capable of co-existence on many portable devices and are seen as being complimentary, USB OTG allowing connection to the huge installed base of USB-capable devices.

Knoppix on a USB Key for booting and trouble shooting.

  • Flat panel displays for mobile computers – laptops, notebooks and netbooks
  • Battery technology for mobile computers – laptops, notebooks and webbooks
  • Laptop, notebook and netbook expansion devices
  • Expansion interfaces for laptops, notebooks and other mobile computers
  • DynaSheet
  • External keyboards for mobile computers.
  • USB On-The-Go – USB technology for PDAs and mobile phones
  • Guide to Kensington Slot (K-lock, Kensington Lock, Universal Security Lock) mobile device security

Filed Under: Mobile Computing Components Tagged With: laptop USB, notebook USB, PDA USB, USB for laptops, USB for notebooks

Latest Articles

Expansion interfaces for laptops, notebooks and other mobile computers

In the early 1990s, the rapid growth of mobile computing drove the development of smaller, lighter, and more portable tools for information processing. One of the most exciting of these innovations was PC Card technology. The power and versatility of PC Cards quickly made them standard … [Read More...]

Handheld Synchronization

Without the capability to transfer and synchronize data back to a desktop system, there's little benefit in having a word processor or similar feature on a PDA - particularly as relatively few devices support printing via a parallel printer port. Its no surpass then that this is a feature … [Read More...]

What’s the Best Tech for Your Small Business in 2021?

The landscape of modern business is often irrevocably changed by technology, and many companies fail or thrive based on their ability to successfully it. If you happen to be a business owner striving to make your 2021 as bright and lucrative as possible, it might be worth thinking about the many … [Read More...]

Gaming Laptop Security Guide: Protecting Your High-End Hardware Investment in 2025

Since Jacob took over PC Tech Guide, we’ve looked at how tech intersects with personal well-being and digital safety. Gaming laptops are now … [Read More...]

20 Cool Creative Commons Photographs About the Future of AI

AI technology is starting to have a huge impact on our lives. The market value for AI is estimated to have been worth $279.22 billion in 2024 and it … [Read More...]

13 Impressive Stats on the Future of AI

AI technology is starting to become much more important in our everyday lives. Many businesses are using it as well. While he has created a lot of … [Read More...]

Graphic Designers on Reddit Share their Views of AI

There are clearly a lot of positive things about AI. However, it is not a good thing for everyone. One of the things that many people are worried … [Read More...]

Redditors Talk About the Impact of AI on Freelance Writers

AI technology has had a huge impact on our lives. A 2023 survey by Pew Research found that 56% of people use AI at least once a day or once a week. … [Read More...]

11 Most Popular Books on Perl Programming

Perl is not the most popular programming language. It has only one million users, compared to 12 million that use Python. However, it has a lot of … [Read More...]

Guides

  • Computer Communications
  • Mobile Computing
  • PC Components
  • PC Data Storage
  • PC Input-Output
  • PC Multimedia
  • Processors (CPUs)

Recent Posts

Virtual Memory

Video Covering Virtual Memory - Part of our Fix Slow Computer tutorial found on  … [Read More...]

OSD Data Storage Technology

Optical Super Density (OSD) technology's design goals were to develop a high capacity (40GB or more) removable MO drive … [Read More...]

CD-ROM Photo CD

Photo CD has been specified by Kodak and Philips based on the CD-i Bridge specification. It comprises the … [Read More...]

[footer_backtotop]

Copyright © 2025 About | Privacy | Contact Information | Wrtie For Us | Disclaimer | Copyright License | Authors