Precessed pulse test arrangement

Claim 2

A telephone switching system comprising: clock means for generating timing pulses, a plurality of dial pulse receiving circuits, first circuit means responsive to said timing pulses for continuously generating interrogate pulses at a first repetition rate, a scanning arrangement responsive to said interrogate pulses to interrogate said receiving circuits for the receipt of dial pulses, second circuit means responsive to said timing pulses for generating simulated dial pulses which advance in time with respect to the occurrence of said interrogate pulses, means for selectively transmitting said simulated dial pulses to said dial pulse receiving circuits, and means for determining whether the number of dial pulses received by said selected receiving circuit during a predetermined period of time is equal to the number of simulated dial pulses transmitted to a selected receiving circuit during said predetermined period of time and for generating mismatch signals.

Claim 3

A telephone switching system in accordance with claim 1 wherein said second circuit means comprises a plurality of pulse distorting elements, each of said elements comprising circuits for distorting pulses in a prescribed manner, and selection means for selectively employing said elements.

Claim 4

A telephone switching system comprising: a dial pulse receiving circuit; scanning means for interrogating said dial pulse receiving circuit, and for detecting the reception of dial pulses by said circuit; clock means for generating clock pulses of a predetermined frequency; said scanning means being responsive to said clock pulses to interrogate said dial pulse receiving circuit approximately once every n discrete time periods; dial pulse generating means responsive to said clock pulses for applying simulated dial pulses to said dial pulse receiving circuit at the rate of approximately one pulse every m discrete time periods; m being greater than n and a nonintegral multiple of n; means for comparing the number of dial pulses detected from said pulse receiving circuit during a fixed interval of time with the number of simulated dial pulses applied to said dial pulse receiving circuit during said intervals of time; and means for generating an error indication when the two numbers are not equal.

Claim 5

A telephone switching system comprising: a dial pulse receiving circuit; scanning means for interrogating said dial pulse receiving circuit, and for detecting the reception of dial pulses by said circuit; clock means for generating clock pulses of a predetermined frequency; said scanning means being responsive to said clock pulses to interrogate said dial pulse receiving circuit approximately once every n discrete time periods; dial pulse generating means responsive to said clock pulses for applying simulated dial pulses to said dial pulse receiving circuit at the rate of approximately one pulse every m discrete time periods; m being greater than n and a nonintegral multiple of n; means for comparing the number of dial pulses detected from said pulse receiving circuit during a fixed interval of time with the number of simulated dial pulses applied to said dial pulse receiving circuit during said intervals of time; and means for generating an error indication when the two numbers are not equal.

Claim 6

A telephone switching system comprising: a switching network; a plurality of dial pulse receivers connected to said network and responsive to the receipt of dial pulses to generate corresponding output signals; a dial pulse generator responsive to control signals for generating simulated dial pulses and connected to said switching network; a scanner arrangement responsive to scan control signals for interrogating the output terminals of said dial pulse receivers and for generating corresponding scanner output signals; a control arrangement comprising: clock means for generating clock signals defining discrete time periods, means for controlling said network to selectively interconnect said dial pulse generator and said dial pulse receivers, means responsive to said clock signals for generating signals for controlling said dial pulse generator to transmit a plurality of dial pulses having a repetition period of approximately m discrete time periods, scan control means responsive to said clock signals for generating said scan control signals with a repetition period of approximately n discrete time periods, m being greater than n, and m being related to n according to a fixed relationship such that m is a nonintegral multiple of n, means for computing the number of dial pulses transmitted to a selected dial pulse receiver during a predetermined period of time, means responsive to said scanner output signals for recording the number of dial pulses received from said selected dial pulse receiver during said predetermined period of time, means for comparing the number of dial pulses transmitted and the number of dial pulses received by said selected dial pulse receiver, during said predetermined period of time, and for generating error indications.

Claim 7

A telephone switching system comprising: a switching network; a plurality of dial pulse receivers connected to said network and responsive to the receipt of dial pulses to generate corresponding output signals; a dial pulse generator responsive to control signals for generating simulated dial pulses and connected to said switching network; a scanner arrangement responsive to scan control signals for interrogating the output terminals of said dial pulse receivers and for generating corresponding scanner output signals; a control arrangement comprising: clock means for generating clock signals defining discrete time periods, means for controlling said network to selectively interconnect said dial pulse generator and said dial pulse receivers, means responsive to said clock signals for generating signals for controlling said dial pulse generator to transmit a plurality of dial pulses having a repetition period of approximately m discrete time periods, scan control means responsive to said clock signals for generating said scan control signals with a repetition period of approximately n discrete time periods, m being greater than n, and m being related to n according to a fixed relationship such that m is a nonintegral multiple of n, means for computing the number of dial pulses transmitted to a selected dial pulse receiver during a predetermined period of time, means responsive to said scanner output signals for recording the number of dial pulses received from said selected dial pulse receiver during said predetermined period of time, means for comparing the number of dial pulses transmitted and the number of dial pulses received by said selected dial pulse receiver, during said predetermined period of time, and for generating error indications.

Claim 8

A telephone switching system in accordance with claim 4 wherein said dial pulse generator comprises: means for generating dial pulses having predetermined make and break periods, a plurality of pulse distorting means responsive to input pulses to produce output pulses which are distorted in a predetermined manner, and means for selectively connecting said dial pulse generator to said pulse distorting means.

Claim 9

A data communication system comprising: a plurality of data receivers responsive to data signals to generate output pulses on the output terminals thereof, clock means for generating timing signals, first circuit means responsive to said timing signals for generating a sequence of interrogate pulses having a first repetition period, interrogating means connectable to the output terminals of said receivers ad responsive to said interrogate pulses to record the receipt of data by said receivers, second circuit means responsive to said timing signals for generating a sequence of test pulses having a second repetition period, and means for transmitting said test pulses to said data receivers, said second repetition period being greater than said first repetition period and a nonintegral multiple of said first repetition period, whereby the occurrence of said test pulses processes in time relative to the occurrence of said interrogate pulses, and means for comparing the number of test pulses transmitted to a selected data receiver with the number of data pulses received by said selected data receiver and for generating error signals.

Claim 10

A data communication system comprising: a plurality of data receivers responsive to data signals to generate output pulses on the output terminals thereof, clock means for generating timing signals, first circuit means responsive to said timing signals for generating a sequence of interrogate pulses having a first repetition period, interrogating means connectable to the output terminals of said receivers ad responsive to said interrogate pulses to record the receipt of data by said receivers, second circuit means responsive to said timing signals for generating a sequence of test pulses having a second repetition period, and means for transmitting said test pulses to said data receivers, said second repetition period being greater than said first repetition period and a nonintegral multiple of said first repetition period, whereby the occurrence of said test pulses processes in time relative to the occurrence of said interrogate pulses, and means for comparing the number of test pulses transmitted to a selected data receiver with the number of data pulses received by said selected data receiver and for generating error signals.

Claim 11

In combination: a plurality of indicator circuits responsive to information signals to generate output pulses, means for generating a plurality of interrogate signals having a first repetition period, means responsive to said interrogate signals to interrogate said indicator circuits for output pulses, means for generating a plurality of test signals having a second repetition period, the occurrence of said test signals being synchronized witH and advanced in time with respect to the occurrence of said interrogate signals, means for selectively transmitting said test signals to said indicator circuits, and means for comparing the number of test signals transmitted to a selected indicator circuit with the number of output signals generated by said selected indicator circuits, and for generating mismatch signals.

Claim 12

In combination: a plurality of indicator circuits responsive to information signals to generate output pulses, means for generating a plurality of interrogate signals having a first repetition period, means responsive to said interrogate signals to interrogate said indicator circuits for output pulses, means for generating a plurality of test signals having a second repetition period, the occurrence of said test signals being synchronized witH and advanced in time with respect to the occurrence of said interrogate signals, means for selectively transmitting said test signals to said indicator circuits, and means for comparing the number of test signals transmitted to a selected indicator circuit with the number of output signals generated by said selected indicator circuits, and for generating mismatch signals.