"; function search(frm) { win = window.open("","scrollbars"); win.document.write(page); txt = frm.srchval.value.split(" "); fnd = new Array(); total=0; for (i = 0; i < item.length; i++) { fnd[i] = 0; order = new Array(0, 4, 2, 3); for (j = 0; j < order.length; j++) for (k = 0; k < txt.length; k++) if (item[i][order[j]].toLowerCase().indexOf(txt[k]) > -1 && txt[k] != "") fnd[i] += (j+1); } for (i = 0; i < fnd.length; i++) { n = 0; w = -1; for (j = 0;j < fnd.length; j++) if (fnd[j] > n) { n = fnd[j]; w = j; }; if (w > -1) total += show(w, win, n); fnd[w] = 0; } win.document.write("

Total found: "+total+"
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"; line += item[which][4] + "
"+link+""; wind.document.write(line); return 1; } Wireless Technology

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Wireless Technologies

The Wireless Technologies Today, mobile access is becoming increasingly important in the business world. Many daily business transactions are completed by handheld devices already. Wireless technology is based on the IEEE (Institute of Electronics and Electrical Engineers) 802.11 standard, which is one of the many standards of the IEEE 802 LAN/WAN standards (Embrey, 2002). 802.11 used to be currently the most affordable and available specification (McKimmy, 2003), but as technology keeps on evolving, now the most affordable standard is 802.11b. The most important factor here is the bandwidth provided by the standard. When wireless network was first introduced into schools, the 802.11 standard could only provide 1 – 2 Mbps connection speed. Later, the 802.11b provided 11 Mbps bandwidth. Both 802.11a and 802.11g standards provide 54 Mbps connection speed between the wireless device and the access point. All bandwidths of different standards mentioned here refer to the total bandwidth which has to be shared among different users. From practical experiences, a typical user is satisfied with a network speed of about 1 – 1.5 Mbps (Horn, 2001). Of course it might not be sufficient to transmit huge movie files but in general this speed is good enough to browse the Internet/Intranet. For better result, 802.11g standard is recommended. In general, the advantages of applying wireless network include:

  • Flexibility to support previously excluded applications and users
  • Ease to install
  • Ease to modify
  • Mobility
  • Portability
  • Inter-connectability
  • Expandability
  • Ease to be segmented
  • Being economical
  • Transparency
  • Reusability
  • Having broad range of coverage and options