Trunk test circuit
US4247742A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 26, 1979 |
| Grant date | Jan 27, 1981 |
| Priority date | — |
| Expiry date | Sep 26, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/28
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A trunk test circuit (107) is disclosed in a stored program controlled toll switching system (103) for executing tests to determine transmission quality of communication trunks connected to a remote telephone office (101). A detector circuit (200) has a novel feedback arrangement comprising a selectable frequency source, comparison circuitry, and a sample and hold circuit, for generating output test signals corresponding to priorly received incoming test signals. The detector circuit is responsive to control signals received from a sequence control circuit (201) for receiving, measuring, and transmitting test signals on a communication trunk (102) under test.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.