| 摘要 |
The invention concerns a system of equipment of central two-number circuit consisting of relay detecting calls from subscribers, separable relay, diode bridge and set of contacts of relays detecting calls from subscribers enabling determining adequate polarisation of circuit, characterised in that lead of interlocking transmission signal (F1) is connected to ground via resistor (R) and via third shorting connector (lc<x>3) of accessory relay and open-out part of switch-over connector (lcl) of separable relay (lc) and fourth shorting connector (lax4) of relay detecting (lax) subscriber's calls (X), and also via fifth shorting connector (lc<x>5) of accessory relay (lc<x>) and second shorting connector (lc2) of separable relay (lc) to reactance elements transmitting signal of interlocking to winding of linear relay (lax), whereas preselection starting lead (74) is connected to ground, via first open-out connector (lc<x>1)of accessory relay (lc<x>) and fourth shorting connector (lax4) of relay detecting (lay) call from subscriber (Y), and fourth shorting connector (lax4) of relay detecting (lax) call from subscriber (X) and fourth shorting connector (lay4) of relay detecting (lay) call from subscriber (Y) are parallel connected, and between the point of connection of these connectors and negative potential is inserted accessory relay (lc<x>), via second shorting connector (lc<x>2) of this relay (lc<x>), whereas shorting part of connector...<IMAGE>
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