| 摘要 |
FIELD: electrical communications; building computerized cross-switching devices for transmission channels. ^ SUBSTANCE: proposed device has switching unit, input number entrance unit, input number display, output number display, service signal generator, service signal switching unit, service signal allocation unit, and coder; newly introduced in device are switches and subtracters; connected to information input of each switch is output of service signal generator; output of respective service signal allocation unit is connected to control input of each switch; output of each switch is connected to second input of respective subtracter; connected to first input of each subtracter is output of respective switching-unit connection point; outputs of subtracters are essentially those of respective switching circuits. ^ EFFECT: avoided arrival of service signal used for direct checkup of switching-system connections at subscriber. ^ 1 cl, 1 dwg |
