Data transmission over the public switched network
US4796292A · kind A · utility
77Cited by
6References
23Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 8, 1987 |
| Grant date | Jan 3, 1989 |
| Priority date | — |
| Expiry date | Dec 8, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q3/0016
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A credit card authorization network which, among other advantages, allows telephone charges to be reduced. A credit card company, operating as an Interexchange Customer, provides trunk-protocol executing modems at a Feature Group B access facility. The modems are interfaced to the trunks, on a T1 digital link, by adapting FXS channel bank cards with a ground start option to translate between E&M signaling and ground start loop signaling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.