Telephone switching system test set

Details Telephone switching system test set Telephone switching system test set

1977-01-07

1978-06-13

Olms, Douglas W.

179 90B, 328 59, H04M 322, H04M 126

Patent

active

040950581

ABSTRACT:
A test apparatus for forward selector switches in a telephone switching system having a telephone loop. Means detects a preselected operative condition in such telephone systems. Means generates a variable number of pulses for control of forward selector switches. The latter includes the following: A switch for closing and breaking a telephone loop to thereby form such a pulse; an indicator for indicating the desired number of pulses including one or more than one pulse; a counter; means for enabling the counter to count the formed pulses greater than one; a control circuit enables the switch to break a telephone loop upon such detection of a predetermined operative condition and for each different state of the counter, and the control circuit is also operative for terminating the breaking by the switch upon a predetermined relation existing between the indicator and counter. Also disclosed is a pulse generating means as a subcombination of the aforementioned.

REFERENCES:
patent: 3239612 (1966-03-01), McAllister
patent: 3351722 (1967-11-01), Fleming et al.
patent: 3600525 (1971-08-01), Garrett
patent: 3700830 (1972-10-01), Naylor et al.

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