Advance Discussion A3
In the old days, the Internet was accessed by dialing-up via computer. Now, there are numerous devices, including game consoles, which carry the net. Today, we will concentrate on the telephone. Cellular phones have become the number one way to access the Internet. When advertisers offer the G series cell phone, G does not mean giga; G refers to the successive numeric version.
Sprint, Verizon, Virgin Mobile use CDMA (Code Division Multiple Access) designed by
. CDMA is wireless interface using spread spectrum where the electromagnetic energy is spread allowing wider bandwidth and multiplexing over the same channel with a shared bandwidth of frequency. Qualcomm, USA
GSM (Global System Mobile) is used by T-Mobile, AT&T and is great in rural areas. GSM originated in 1982 by the European Conference of Postal & Telecommunication (CEPT) is used by 80% of the world; and boasts wider international roaming capacity. Advanced GSM incorporates TDMA (Time Division Multiple Access). EDGE (Enhanced Data GMA Evaluation) is designed for streaming television and multimedia.
The iPhone uses VPN (Virtual Private Network). iPhone has excellent tracking application to find your mislaid or pilfered phone.