Abstract:
A coupling system for a telecommunication exchange installation is described having a plurality of interconnected binary switching matrices. Each switching matrix has at least two row and two column lines with means for connecting row lines to column lines. A plurality of connection lines form input and output lines for the system of interconnected switching matrix. The interconnection arrangement for the interconnected switching matrices is such that a row line of at least one multiple is connected to a row line of another multiple or a connection line. The other row line of the one switching matrix is connected to a column line of another switching matrix or to a connection line. One column line of the one switching matrix is connected to a column line of another switching matrix or to a connection line. The other column line of the one switching matrix is connected to a row line of another switching matrix or to a connection line.
Abstract:
A telecommunications network arranged in a hierarchical manner establishes synchronism between operation of pulses at different locations within the network, by sensing a predetermined phase deviation between a master pulse train and a locally produced pulse train, correcting the deviation by adjusting the phase of the locally produced pulse train, determining the time between required corrections of the phase of the locally produced pulse train, and adjusting the control voltage of the master oscillator for the locally produced pulse train in response to the time interval between successive corrections of the phase of the locally produced pulse train.
Abstract:
A circuit arrangement is described for the reception and transmission of switching data associated with communication signals being transmitted to or from an exchange in a telecommunication system. In the system the signals are transmitted between exchanges by pulse code modulation techniques. Each exchange is provided with separate receiving/transmitting devices for the communication signals and the switching data signals, and each communication receiver/transmitter has a switching data receiver/transmitter assigned thereto. The latter are connected to a common control unit.
Abstract:
A TDM/PCM switching network comprising a plurality of time and spatial switching circuits associated with different groups of TDM lines. The present invention is primarily concerned with the manner in which these time and spatial switching circuits are arranged to transmit PCM words from a particular origin route to a given destination route. The spatial switching circuits each include intermediate storage means having a plurality of individual storage positions which are individually assigned to a predetermined destination route in the switching network. Time slots on the TDM lines are divided into a plurality of time intervals each associated with a particular TDM line of the group of TDM lines connected to the time circuit. Time slots are transmitted to the spatial switching circuit which includes a holding storage for allocating the PCM signal contained in the time intervals of a particular time slot to an intermediate storage according to the time slot or time channel itself. The PCM signals are connected to the appropriate destination TDM line through a demultiplexer/multiplexer device and other spatial switching circuits.
Abstract:
Apparatus for converting analog to digital signals and vice versa is described wherein a storage capacitor provided at an input of a codec operating in accordance with the iterative method and designed for receiving analog signals to be converted into digital signals is further connected either to a constant current generator or to the digital-to-analog converter of the codec for a period during which a voltage may be applied to the capacitor which correponds to a digital signal that is to be converted into an analog signal and that has been applied to the digital-to-analog converter. A two-wire circuit transmitting analog signals in both directions of transmission is connected to the storage capacitor. The resonance-exchange-of-charge method is used for the transmission of the analog signals.
Abstract:
In illustrated embodiments, at least one analogue shift register has a number of parallel inputs and one series output. A number of individual evaluating circuits receive the signal to be filtered and supply respective output quantities of charge equal to the product of the difference between the relevant signal value and a predetermined minimum or maximum value, and a respective individual evaluation factor. The output of each evaluating circuit can be connected via a switching element to an associated parallel input. The capacity of every storage position of the shift register is at least such that it is always able to accommodate the maximum quantity of charge supplied by the preceding storage position, and when the storage position has a parallel input, can additionally accommodate the maximum quantities of charge supplied by the associated evaluating circuit (s). Various modifications are disclosed for reducing the space requirement of a transversal filter when implemented, for example, as a CCD.
Abstract:
A technique of reducing "crosstalk" in transmission lines for time multiplex pulse communication, by insertion of artificial compensating networks having an impedance varying with frequency in opposite sense as compared with the natural impedance of the line. The values of the elements of the network are determined by transmitting a pulse over the line and determining the distortion to that pulse.
Abstract:
A time division multiplex (TDM) switching network having TDM switching units which, through time position conversion, selectively assign time slots on connected TDM lines is described. The TDM lines are formed into a matrix, the crosspoints of which are connected by the TDM aforementioned switching units. The TDM switching units have a fixed traffic capacity which is defined by the maximum number of time slot connections that the switching units are capable of making between the TDM lines connected thereto. The fixed traffic capacity of the switching units is dependent on the size of the TDM switching network but smaller than the maximum rated traffic capacity of the TDM lines. As a result, in the event the TDM switching network is expanded, the fixed traffic capacity of the additional TDM switching units can be progressively reduced.
Abstract:
A time division multiplex (TDM) switching network for a telecommunications system or the like is described. The network contains switching network units for causing time slots formed on connected TDM lines to be assigned on a space/time division basis. The TDM lines are formed into trunk groups, and the trunk groups, respectively, form the row and column lines of a matrix. The switching network units are arranged at the crosspoints of the trunk groups to form the crosspoint switching elements between the intersecting trunk groups or between lines of the same trunk group. Each switching network unit is constructed to have a capacity for completing a number of connections less than the number of connections the crosspoint with which it is associated is capable of carrying.
Abstract:
A PCM TDM switching network has a time-space-time structure composed of switch-through units which, being interlaced and released on a time basis, each operate a plurality of TDM transmission lines and TDM intermediate lines which connect the switch-through units to one another. The units effect both the time-wise and spatial assignment of time channels seized on incoming TDM lines to time channels seized on outgoing TDM lines by means of time slot conversion. The TDM transmission and the TDM intermediate lines are, in each case, connected as groups, by way of separate concentrator and distributor circuits and super-multiplex lines connected thereto which carry the interlaced items of information to the transmission memory of the relevant switch-through unit. The concentrator and distributor circuits which are assigned to the TDM transmission lines comprise cyclically operated multiplexers and demultiplexers, whereas the concentrator and distributor circuits assigned to the TDM intermediate lines are operated acyclically and their interlacing and release arrangement is modified only in the event of changes to the switching network.