LOW-CAPACITY TELEPHONE EXCHANGE Russian patent published in 1997 - IPC

FIELD: telephony; construction of exchanges in which more than half the connections are made inside it. SUBSTANCE: telephone exchange has subscriber's sets 1₁-1_m, first-step switching units 2₁-2₄, dialed number receivers 3₁-3₄, conference-call set 4, second -step switching unit 5, outgoing sets of connecting lines 6, and control unit. In spite of small quantity of equipment, telephone exchange provides for normal communications and capacity variation. EFFECT: reduced quantity of switching equipment. 1 dwg