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Gadgets which have become Obsolete
By siliconindia
Dialup Modems
Digital modems (MODulate/DEModulate), developed from the need to transmit data for the North American air defence during the 1950s. The first commercial modem-the Bell 103-was manufactured in 1962 by AT&T. The modems were used to communicate data over the public switched telephone network (PSTN), and were used to send and receive data between two computers. The dial-up connections required no infrastructure other than the telephone network. It requires time to establish a telephone connection, before the data transfers can take place, and in places with telephone connection charges, each connection would incur an incremental cost, and if the calls are time-metered the duration of the connection incurs costs. Typical dial-up modems have a maximum transfer speed of 56 kbits/sec, while in majority cases the norm is 40-50 kbits/sec. The broadband internet access has been replacing the dial-up modems in many parts of the world, and offer speeds of 700 kbits/sec and higher for the approximately same price as dial-ups, or even lesser.
