Line concentrator
US4230913A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 4, 1979 |
| Grant date | Oct 28, 1980 |
| Priority date | — |
| Expiry date | Jan 4, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q3/545
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A telephone switching system comprising a central office switching unit and a remote field switching unit controlled by the central office unit. The field unit provides controlled connections between a number of trunks extending from the central office unit and a greater number of subscribers connected to the field unit. The field unit additionally contains a number of intracall lines for establishing a connection between two subscribers without the need for sustained trunk connection after the call is established. The central office unit includes a system controller comprising a microprocessor and associated memory units. The system controller receives information interrupts from both the central office unit and the remote field unit as to subscriber calls, subscriber identity, trunk availability and overall system condition alarms. Appropriate control signals are sent from the central office unit to the remote unit to establish the appropriate connections between the units for subscriber connections. Control and data words and interrupts travel between the central office unit and the remote field unit over a voice grade, duplex data channel. Control and data words are in binary a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.