摘要:
A broadband matrix switching system switches a plurality of output loads to any of a plurality of input signal sources. Modular printed circuit cards which carry cross-point switches and transmission lines are mounted on a motherboard; an input distribution card being provided for each input to the matrix switching system and an output selection card being provided for each output. The input distribution cards have distribution networks and low capacitance cross-point switching cells which provide selective connections to all of the output select cards via transmission lines on the input transmission lines and other transmission lines carried by the motherboard. The input distribution card further provides a termination which is of value equal to the characteristic impedance of each input signal source. The switches on the input cards connect each output of the input distribution cards to either an output select card or a dummy load resistor which is of value equal to the characteristic impedance. Through the use of signal carrying lines of the same length and the cross-point switches located in accordance with a geometry which standardizes the path lengths to the cards, the effects of any mismatched impedances are minimized to thereby provide for improved frequency response characteristics, constant propagation delays, reduced voltage standing wave ratio, and improved cross-talk characteristics.
摘要:
A relay system or relay block consists of stacked reed relays each housed in an envelope. Said relays are supported by pairs of spaced parallel relay supports which, in turn, are received by a frame structure having a front panel including printed circuitry means for properly interconnecting the constituent reed relays of the relay system or block, and for connecting the relay system or block with external equipment.
摘要:
A magnetically controlled switching device having a magnetic shunt plate with many terminals arrayed along the peripheral portions thereof, a plurality of coil forms located at the crosspoints of a matrix consisting of X and Y coordinates on a plane surrounded by the terminals on the magnetic shunt plate, an X coil control line wound on each of the coil forms in the row in the X direction in an alternately reversed manner, both ends of the X coil line being connected to corresponding terminals located along the X direction, a Y coil control line wound on each of the coil forms in the column in the Y direction in an alternately reversed manner, both ends of the Y coil control line being connected to corresponding terminals located along the Y direction, reed switches accommodated in each of the coil forms, contact points of the reed switches corresponding to the magnetic shunt plate, and the reed switches being connected to a plurality of matrix crosspoints consisting of multiple connection wires in the directions X and Y, which are arrayed on both the front and back surfaces of the magnetic shunt plate. A relay terminal plate having a plurality of pairs of coil relay terminals is provided at a central portion of the magnetic shunt plate to divide the coil forms into two groups, such that at least two independent matrices are formed on the magnetic shunt plate.
摘要:
A multicontact sealed electromagnetic coordinate selection device comprises a movable contact type spring supported at both ends by supporters at a prescribed interval from a metal plate and electrically insulated from said metal plate, the movable contact type spring elastically supporting a plurality of movable contacts facing the corresponding stationary contacts formed on the upper ends of stationary contact terminals which penetrate said metal plate. The lower ends of said stationary contact terminals are supported by a magnetic metal member.
摘要:
Signal switching devices employing electromagnetic switching elements having particular application in the switching network of automatic telephone exchanges are disclosed. The switching devices are of the kind comprising an input and output signal line electromagnetic switching matrix. The switching devices include a cutoff circuit and/or off-normal circuit integrated with the switching matrix.
摘要:
A switching device is provided which is of a highly integrated structure and particularly adapted for a matrix arrangement of switch elements. The structure characteristically enables the switching device to be efficiently fabricated with maximum component density and minimum cost, and includes a base plate in the form of an integral combination of two insulating plates lying on each other, fixed contacts formed in an appropriate pattern on one of the insulating plates, and movable contacts formed integrally with spring strips supported on the base plate.