Mobile Communication
...mobile communication
The A-Netz was the first cellular analog network in Germany and it was introduced 1952 by the Deutsche Bundespost under the Name Öffentlicher beweglicher Landfunk and existed until 1977. The calls had to be forwarded by human operators. In 1968 about 80% of western Germany was covered with the A-Netz. The capacity limit of 11.000 users was reached in 1971.
The B-Netz was an analog commercial mobile radio telephone network that also was oper-ated by the Deutsche Bundespost (at first only in West Germany) from 1972 until 1994. The system was also implemented in the neighboring countries Austria, the Netherlands and Luxembourg. The B refers to the fact that it was the country's second public mobile tele-phone network, following the A-Netz. As opposed to its predecessor, it featured direct-dialing (so that human operators were not required to connect calls).
A major limitation of the system was that, in order to reach a subscriber, one had to know his location since the handset would assume the local area code of the base station serving it. Handoff was not possible and calls were dropped when switched cells. Roaming was poss-ible between the implementing countries.
At its climax in 1986, the network had 158 base stations and about 27,000 subscribers in Germany. The network was vastly oversubscribed and finding an available channel could proof difficult.
The C-Netz was officially introduced in 1985 (with unofficial trials in 1984) to replace the existing B-Netz/B2-Netz system used in Germany at the time. Due to problems with the B-Netz mobile networks, early adoption of C-Netz was very high, especially in rural areas which had lacked prior B-Netz coverage. However, like other first-generation analog systems, it suffered from poor call quality and was susceptible to eavesdropping. The system was built up in West Germany and West Berlin, but...
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