| 摘要 |
FIELD: telephone communications engineering; telephone exchanges. ^ SUBSTANCE: proposed telephone exchange has subscriber sets, subscriber selector switching unit incorporated in first, second, and third switchboards, first and second intermediate-line units, subscriber selection marker, cord set unit, register selection switching unit, register unit, register selection unit, group selection marker, group selection switching unit incorporated in first and second switchboards, intermediate-line unit, first, second, and third connection-line sets, station-to-station communication unit, interaction-signal unit, trunk communication channel set, digital information receiving and transmitting unit, matching unit, numeric-control unit, and public signaling unit; newly introduced in exchange are three-section subscriber selector switching unit incorporated in first, second, and third switchboards, first and second intermediate-line, subscriber, register, and group-selection units, two-section group-selection switching unit incorporated in first and second switchboards, and intermediate-line unit, station-to-station communication unit, interaction signal unit, digital information receiving and transmitting unit, matching unit, numeric-control unit, and public signaling unit. ^ EFFECT: enhanced reliability of data transmission line, enlarged functional capabilities of exchange. ^ 1 cl, 8 dwg |
