MAKE A MEME View Large Image Telephone switchboard cross-switching (Rankin Kennedy, Electrical Installations, Vol V, 1903).jpg NB - Note that this is not a crossbar switch A crossbar akin to this diagram would have in and out connections lines and instruments running ...
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Keywords: Telephone switchboard cross-switching (Rankin Kennedy, Electrical Installations, Vol V, 1903).jpg NB - Note that this is not a crossbar switch A crossbar akin to this diagram would have in and out connections lines and instruments running parallel with a number of crossbars representing the total simultaneous call capacity running across them In this early and simpler form the lines and instruments are connected directly This requires more connection points in total for a moderately sized public exchange this soon becomes a huge number of potential connections Telephone exchange equipment
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