What are the key differences between first- and second-generation cellular systems?

Elaborate the major difference between first- and second-generation cellular systems?
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"Digital traffic channels: The most notable difference between the two generations is that first generation systems are almost purely analog, where as second generation systems are digital. In particular, the first generation systems are designed to support voice channels using FM; digital traffic is supported only by the use of a modem that converts the digital data into analog form. Second generation systems provide digital traffic channels. These readily support digital data; voice traffic is first encoded in digital form before transmitting. Of course, for second generation systems, the user traffic (data or digitized voice) must be converted to an analog signal for transmission between the mobile unit and the base station. Encryption: Because all of the user traffic, as well as control traffic, is digitized in second generation systems, it is a relatively simple matter to encrypt all of the traffic to prevent eavesdropping. All second generation systems provide this capability, whereas first generation systems send user traffic in the clear, providing no security. Error detection and correction: The digital traffic stream of second generation systems also lends itself to the use of error detection and correction techniques. The result can be very clear voice reception. Channel access: In first generation systems, each cell supports a number of channels. At any given time a channel is allocated to only one user. Second generation systems also provide multiple channels per cell, but each channel is dynamically shared by a number of users using time division multiple access (TDMA) or code division multiple access (CDMA)."
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"Electronic targeted visitors channels - initial gary :solely analog 2g: systems tend to be electronic digital encryption: almost all 2g supply encrypted sheild to counteract eavesdropping problem detection in addition to static correction: 2g targeted visitors makes for recognition as well as modification, giving distinct style reception station admittance: 2g techniques let stations to get dynamically divided by the quantity of consumers"
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