Wireless Internet USB AdapterInternet is a readily available source of information. But this is not only reason that Internet has become the part of almost every network these days. Apart from information using Internet instead of other sources is quite effective as well. So if we talk about wireless communication then it’ll be unfair not mentioning the wireless Internet. But first you must have some understanding of VPN.
Virtual Private Network (VPN)
VPN (virtual private network) is the network based on public Internet. Being the public is not issue, because security problems can easily be solved. This is the reason that VPN is the most common and reliable network for Internet implementation. Moreover you can observe VPN based Internet services in banking where is much more critical. VPN technology is also used for wireless Internet. Now let us move towards our real question of wireless Internet.
Wireless Internet Technologies
In common three types of technologies are available for Wireless Internet implementation. These include Wireless WAN Hotspots, UMTS, and GPRS. Well UMTS and WAN hotspots show numerous disadvantages over GPRS. Therefore our concern is with the GPRS. But first lets have a brief look that what is wrong with UMTS and WAN hotspots.
Wireless WAN hotspots
The main problem with Wireless WAN hotspots is that they can only be implemented in specific areas. As a result it becomes quite difficult to take Internet into distribution substations. Moreover the login schemes hotspots use is based on Personal Computers. So these schemes offer more issues when it comes to telecontrol applications.
UMTS (Universal Mobile Telecommunication Service)
Well if you are able to get UMTS then nothing is better. But the problem is that you can find UMTS in urban areas of only a few countries. And also no industrial modems are developed yet for the applications. UMTS is a 3G (third generation) technology. It offers much more higher bandwidth than GPRS / GSM.
GPRS option for wireless Internet
GPRS stands for general packet radio service. It is a wireless transmission of data packets on radio waves. Global System for Mobile communication (GSM) offers this service. Transmission is based on IP / Internet protocol. The communication structure for GPRS is the same as for the cell phone calls. In GPRS case BSC (base station controller) is connected to the Internet and Internet further connected to the corporate network.
GPRS Internet communication Overview
Wireless stations send information to the cellular towers. This information is received by the BSC. If I say in one line, then a GPRS network BSC receives / transmits IP based packets from / to the Internet. So, in a "normal" GPRS environment, a mobile station always exchanges IP (v4) packets with the Internet.
