tailieunhanh - Mạng và viễn thông P25

Broadband, Multimedia Networks and the B-ZSDN The emergence of ‘multimedia’ computers and software which use all sorts of different audio, data, image and video signals simultaneously has heralded a new generation of computers and computer ‘applications’ and spurred the need to develop and deploy a new universal technology for telecommunications | Networks and Telecommunications Design and Operation Second Edition. Martin P. Clark Copyright 1991 1997 John Wiley Sons Ltd ISBNs 0-471-97346-7 Hardback 0-470-84158-3 Electronic PART 4 MULTIMEDIA NETWORKS Networks and Telecommunications Design and Operation Second Edition. Martin P. Clark Copyright 1991 1997 John Wiley Sons Ltd ISBNs 0-471-97346-7 Hardback 0-470-84158-3 Electronic 25 Broadband Multimedia Networks and the B-ISDN The emergence of multimedia computers and software which use all sorts of different audio data image and video signals simultaneously has heralded a new generation of computers and computer applications and spurred the need to develop and deploy a new universal technology for telecommunications. The broadband-ISDN B-ISDN will be this new universal technology. It will be a powerful network capable of carrying many different types of services and communication bitrates. MULTIMEDIA APPLICATIONS THE DRIVER FOR BROADBAND NETWORKS A multimedia application is one in which different types of communication signal are transmitted simultaneously. Thus for example multimedia computers are able simultaneously to present spreadsheets work processing and presentation foil windows on the screen while simultaneously also showing a video projecting a video telephone call and playing a soundtrack Figure . Multimedia applications greatly increase the possibilities of the modern computing and entertainment industries and they are finding their way into all walks of modern life Teleworking Telemedicine Tele-education Teleshopping 439 44 BROADBAND MULTIMEDIA NETWORKS AND THE B-ISDN The simplest type of teleworking is that allowing a company executive to log his laptop PC into the company computer network and electronic mail facility no matter what his location. Thus working at home and during time away on a business trip becomes possible. Other forms of teleworking include applications designed to bring together groups of remotely located individuals .