The data battle is the most complex and may be the most important. The complexity of this battle starts with the huge number of players, including wireless, wire line, satellite, cable and companies from different industries such as the computer industry, all trying to define the standards. The data battle is probably the most important because if we consider voice transmission as a particular case of data transmission (IP telephony, cable phone), this battle could include part of the voice battle. We can split the data battle into two sub-battles, the first focused on mobile data transmission and the second on no-mobile data transmission. To get a better sense of the mobile data transmission sub-battle, imagine a salesperson or an executive, out of the office, trying to connect his or her notebook with the company intranet. He or she can use wire line or wireless technology to make this connection. Forecasts are showing an exponential growth for this kind of mobile data transmission. In the no-mobile side we can imagine a similar person trying to access the Internet from home or from the office. In this case, he or she still has the same first two options (wireless broadband for instance) but technologies like ISDN, DSL, cable modem or satellite dishes (PC Direct) can also be chosen to make the connection.