Multi-stage switching networks for use in telecommunications exchanges
US3993874A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 1974 |
| Grant date | Nov 23, 1976 |
| Priority date | — |
| Expiry date | Nov 21, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q3/0012
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A bi-directional switching network for a telecommunications exchange in the form of a matrix array of symmetrical switching devices each having many terminations at opposite sides. The switching devices of each row individually have their terminations at one side multipled whereas the switching devices of each column individually have their terminations at the other side multiplied. In a preferred embodiment each switching device includes at least one switching module comprising A-switches, B-switches and a C-switch all of the relay-matrix type; the first two categories of switches being arranged in planes. Connections are usually established over an A-switch and a B-switch of an appropriate plane, but the C-switch is available for interposing between any A-switch and B-switch under heavy traffic conditions and provides for switching between planes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.