Digital Data Communications LEVEL ONE FCS-4500 Manual de usuario Pagina 73

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Jamadagni H S DC/V1/2004 2
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Manual - through operator 1880 onwards
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Step-by-Step Strowger ~1897
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First "big" strowger exchange 1919
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# 1 Cross bar 1938
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# 5 Cross bar 1948
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# 3 Cross bar 1974
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ESS I 1965
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ESS II 1970
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ESS III 1976
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ESS ZB 1976
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ESS IA 1980 onwards
PAX : Private automatic exchange useful for local connections
only
PABX: Private automatic branch Exchange useful for local and
trunk connections
History of Switching
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