| This article discuses about the various types of | | | | networks, the speed would be higher ranging |
| wireless networks and the speed, distance of | | | | around 1-2 Mbps for upload and download |
| each type of the wireless | | | | correspondingly. The great advantage of satellite |
| networks.1.NARROWBAND WIRELESS | | | | networks are for their huge coverage area, The |
| LANS:Narrowband Wireless LANS keep the radio | | | | major drawback of these networks is the delay |
| signal frequency narrower and an ability to pass | | | | that exists while connecting. So these networks |
| the information along the narrower range. Though | | | | are found to be nearly dumb when dealt with the |
| the distance through these LANS are reasonable | | | | bursty traffic.4. INFRARED WIRELESS LANS: |
| but still speeds available aren't adequate enough | | | | Infrared wireless LANS though have a shorter |
| fot the corporate users. The major problem that | | | | available range, their speed range are increasing |
| would ocur is interference. But it can be | | | | from 115Kbps to 4Mbps. In the near future, usage |
| overcome by allowing individual user onto inividual | | | | of Very Fast InfraRed (VFIR) may increase the |
| frequencies.2.PERSONAL COMMUNICATIONS | | | | speed upto 16Mbps. These type of LANS are |
| SERVICES:PCS comprises of a entire range of | | | | used in Laptop to PDA transfers and between |
| mobiles, portable and auxilary communication | | | | laptops.5. SPREAD SPECTRUM WIRELESS LANS: |
| services for both business and personal usage. | | | | These LANS are a wideband radio frequency |
| There are 2 types of PCS as explained belowa. | | | | technique using LANS. These LANS are both |
| NARROWBAND PCS: The size of the spectrum is | | | | reliable and secure. The most popular WLAN used |
| smaller than broadband PCS. Narrowband PCS | | | | is 802.11b that runs upto 11Mbps, but the 802.11g |
| applications include paging, text mesaging, wireless | | | | specification can boost it upto around 22Mbps.The |
| email, wireless telemetry.b. BROADBAND PCS: | | | | 802.11a with 5Ghz range can run a bandwidth |
| This type of PCS has larger spectrum compared | | | | around 50Mbps which can increase to 100Mbps in |
| to narrowband PCS. Broadband PCS application | | | | the near future. But the distance is less thanwhat |
| include all Mobile Telephone services and Mobile | | | | we get with 802.11b & 802.11g 2.4Ghz range, (i.e) |
| Data Services. All these Mobile set of services are | | | | around 300 feet or so. Usually considering these |
| available to the users via small. portable, | | | | factors 802.11a is used in a shorter distance |
| multifunctional devices like digital camera, | | | | outdoor regions while 802.11b/g are used |
| cellphones etc.3. SATELLITE: Using satellite | | | | indoors.K.Murali graduated from St. |