Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems (1921)
Smith, Arthur Bessey, b. 1875, Campbell, Wilson Lee · New York : McGraw-Hill · leaf 154
cond selectors for their first four contacts, but share the last six withthe other first selectors. Since most of the traffic takes the first fewcontacts of a level, this arrangement permits the last six second selectors tocarry all that spills over. Figure 129 shows how such a scheme is worked out… … Contacts on onelevel 1 H 45 & 1 8 9 0Fig. 129.—Selectors trunking into 14 switches (terminal connections). the support for D-J high, to let the second half of the first selectors usethe second section of second selectors alone, freeing the first section forthe sole use of the first half of…
Telephone
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