High-Speed Office NetworksTraditionally, the office environment has included a variety of devices with low- tomedium-speed data transfer requirements. However, applications in today’s officeenvironment would overwhelm the limited speeds (up to 10 Mbps) of traditionalLAN. Desktop image processors have increased network data flow by an unprecedentedamount. Examples of these applications include fax machines, documentimage processors, and graphics programs on personal computers and workstations.Consider that a typical page with 200 picture elements, or pels1 (black or whitepoints), per inch resolution (which is adequate but not high resolution) generates3,740,000 bits Even withcompression techniques, this will generate a tremendous load. In addition, disk technologyand price/performance have evolved so that desktop storage capacities ofmultiple gigabytes are common. These new demands require LANs with high speedthat can support the larger numbers and greater geographic extent of office systemsas compared to backend systems.Backbone LANsThe increasing use of distributed processing applications and personal computers hasled to a need for a flexible strategy for local networking. Support of premises-widedata communications requires a networking service that is capable of spanning the distancesinvolved and that interconnects equipment in a single (perhaps large) building
đang được dịch, vui lòng đợi..