Philips 190b5 user manual USB or Universal Serial Bus

Page 23

Glossary

U

USB or Universal Serial Bus

A smart plug for PC peripherals. USB automatically determines resources (like driver software and bus bandwidth) required by peripherals. USB makes necessary resources available without user intervention.

●USB eliminates "case anxiety" -- the fear of removing the computer case to install add-on peripherals. USB also eliminates adjustment of complicated IRQ settings when installing new peripherals.

●USB does away with "port gridlock." Without USB, PCs are normally limited to one printer, two Com port devices (usually a mouse and modem), one Enhanced Parallel Port add-on (scanner or video camera, for example) and a joystick. More and more peripherals for multimedia computers arrive on the market every day. With USB, up to 127 devices can run simultaneously on a computer.

●USB permits "hot plug-in." There's no need to shut down, plug in, reboot and run set-up to install peripherals. And no need to go through the reverse process to unplug a device.

In short, USB transforms today's "Plug-and-Pray" into true Plug-and-Play!

Hub

A Universal Serial Bus device that provides additional connections to the Universal Serial Bus.

Hubs are a key element in the plug-and-play architecture of USB. The Figure shows a typical hub. Hubs serve to simplify USB connectivity from the user's perspective providing low cost and complexity.

Hubs are wiring concentrators and enable the multiple attachment characteristics of USB. Attachment points are referred to as ports. Each hub converts a single attachment point into multiple attachment points. The architecture supports concatenation of multiple hubs.

The upstream port of a hub connects the hub towards the host. Each of the other downstream ports of a hub allows connection to another hub or function. Hubs can detect, attach and detach at each downstream port and enable the distribution of power to downstream devices. Each downstream port can be individually enabled and configured at either full or low speed. The hub isolates low speed ports from full speed signaling.

A hub consists of two portions: the Hub Controller and Hub Repeater. The repeater is a protocol- controlled switch between the upstream port and downstream ports. It also has hardware support for reset and suspend/resume signaling. The controller provides the interface registers to allow

file:///D/My%20Documents/dfu/W9/english/190b5/glossary/glossary.htm (3 of 5)2004-09-21 9:05:15 AM

Page 22 Page 24
Image 23
Page 22 Page 24
Contents Philips LCD Monitor Electronic User’s Manual Installation Locations Safety precautions and maintenanceReturn to TOP Notational Descriptions About This GuideReturn to TOP Technical Specifications Product FeaturesScanning SRGB Resolution & Preset ModesFreq kHz Resolution Freq Hz Automatic Power SavingPin Assignment Physical SpecificationsPin Assignment Physical Function Product ViewsSwivel Height adjustment Front View Product Description Installing Your LCD MonitorOptimizing Performance Rear ViewMore about FPsetup04.exe OSD Tree Description of the On Screen DisplayDigital signal input Return to TOP Customer Care & Warranty Glossary Energy Star Computers Program USB or Universal Serial Bus Device Vertical refresh rate Download and Print Printing instructions Return to TOP General FAQs FAQs Frequently Asked QuestionsFAQs Frequently Asked Questions Screen Adjustments Compatibility with other Peripherals LCD Panel Technology FAQs Frequently Asked Questions What is the CE mark? Ergonomics, Ecology and Safety StandardsReturn to TOP Common Problems TroubleshootingImaging Problems Return to TOP TCO 99 Information Regulatory InformationFlame retardants Environmental RequirementsLead TCO03 InformationEcology Recycling Information for CustomersEnergy Star Declaration CE Declaration of ConformityFederal Communications Commission FCC Notice U.S. Only PhilipsEN 55022 Compliance Czech Republic Only Commission Federale de la Communication FCC DeclarationMIC Notice South Korea Only Vcci Notice Japan OnlyPolish Center for Testing and Certification Notice Bsmi Notice Taiwan Only North Europe Nordic Countries InformationInformation for UK only Ergonomie Hinweis nur DeutschlandEnd-of-Life Disposal Earthed Return to TOP Information for Users outside the U.S Information for Users in the U. SPhilips SmartControl SmartManage Features and BenefitsIntroduction Click Philips SmartControl tab SmartManage SmartManage Return to TOP Philips Flat Panel Monitors Pixel Defect Policy Philips Pixel Defect PolicyProximity of Pixel Defects Total DOT Defects Connecting to Your PC Accessory PackCable Management Return to TOP Unfold and Fold the Base Unfold the Base BaseRemove the Base Condition Return to TOP For Windows Me For WindowsFor Windows XP Dialog box Your Philips F1rst Choice Warranty Just a click away Just a phone call away Page Your Guarantee in Central and Eastern Europe Just a click away Just a phone call away Your International Guarantee Page Your Philips F1rst Choice Warranty Before Requesting Service To GET Warranty Service in Canada Just a phone call away F1rst Choice Contact Information Croatia BelarusBulgaria Czech RepublicLithuania EstoniaHungary LatviaRussia SlovakiaSlovenia PolandBrasil UkraineAntilles ArgentinaPeru ColombiaMexico ParaguayAustralia UruguayVenezuela CanadaHong Kong NEW ZealandBangladesh ChinaIndonesia IndiaPhilippines KoreaMalaysia PakistanMorocco SingaporeTaiwan ThailandDubai South Africa
Top Page Image Contents