Wednesday, November 14, 2012

Network Management: Free 4G Wireless Internet

Network Management: Free 4G Wireless Internet



" Wireless vs Mobile"


Many people use the terms wireless and mobile as synonyms. This is not strictly true. In this table we try to illustrate the differences between the terms wireless and mobile.

Those users that are not wireless and not mobile are easy to come up with. This is what youcan call "traditional data communications" and consists of conventional LAN, MAN and WAN technology, such as ethernet, FDDI or X.25.

At the other extreme, there are users that are both wireless and mobile. So here we can have
taxis using radio modems, field service engineers (recall that Mobitex's first application was for Telia's field service engineers), transport and public safety users.

What about the users that are using wireless technology but are not mobile? These are the traditional "telemetry" applications that were mentioned in chapter 13. These include parking or gas meters and coke machines.

The last set of users, those that are mobile but not wireless are a little harder to define. Imagine the following scenario, I sit in my office in Gothenburg and work on my laptop PC connected to my local network. Then I pick up my laptop, jump on a plane and fly to Stockholm. There I plug my PC into the LAN in Stockholm and carry on working as if I was on my home network. In this case I'm using wired technology - the two Local Area Networks, but in some sense I'm mobile because I move around the country. This type of access is called Nomadic Computing. An example of technology that allows this kind of movement is Mobile IP, which will be explained in more detail later.

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