Universal measured service interface for step-by-step telephone exchanges
US4440978A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 12, 1982 |
| Grant date | Apr 3, 1984 |
| Priority date | — |
| Expiry date | Jul 12, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M15/06
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A universal measured service system for a central office exchange senses the condition of relays in the line equipment for each line as well as the conditions of the linefinders. The system associates the outgoing lines of each linefinder with the incoming line connected to the linefinder by identifying an incoming line placing a call that is connected to a linefinder in the exchange at about the same time that a specific linefinder has connected an incoming line to its outgoing line. Once an incoming line has been identified as being connected to an outgoing line of the linefinder, the number called through the incoming line can be determined by counting the dial pulses on the linefinder outgoing line. The system is also capable of accommodating 200-line linefinders arranged in subgroups by also sensing signals from the linefinder group relays identifying which subset of incoming lines is being accessed by the linefinders.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.