Telephone switching system test set
US4095058A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 7, 1977 |
| Grant date | Jun 13, 1978 |
| Priority date | — |
| Expiry date | Jan 7, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/323
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.