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