Guest editorial - 50th anniversary of CLOS networks
[ 1 ] Instytut Elektroniki i Telekomunikacji (IEt), Wydział Elektryczny, Politechnika Poznańska | [ P ] employee
2003
editorial
english
EN Switching plays a vital role in telecommunications net-works. Shortly after the telephone was invented by Alexander Graham Bell, first-generation telephone exchanges were installed. The main part of a switching system is the switching network, which enables the setup of a connecting path between any input and any output. At that time, implementation of crosspoints was purely electrome-chanical, and the implemented switching networks were mostly blocking ones (i.e., there might exist an idle input and idle output for which no connection path can be established due to existing connections). The known nonblocking architecture was a crossbar, which is too costly because the number of crosspoints required grows quadratically with the number of input and output ports.
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