Modem pooling system for communicating between a telephone and a plurality of data terminals
US5337348A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 1991 |
| Grant date | Aug 9, 1994 |
| Priority date | — |
| Expiry date | Jun 19, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q11/0428
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In a key telephone system in which a plurality of data terminals 37l . . . 37n such as personal computers are connected to a key service unit 1 connected to a plurality of telephone lines 25l . . . 25m, a modem 43 is pooled so as to be usable in common for the plural data terminals 37l . . . 37n. In response to a called party number signal from the telephone lines (e.g. 25l) in dial-in service, the key service unit 1 selects a single data terminal designated by an extension telephone designation signal in dial-in service from among the data terminals 37l . . . 37n, and closes a communication channel between the selected data terminal (e.g. 37l) and the modem 43, so that a status equivalent to that where the selected data terminal 37l and the modem 43 are directly connected to each other can be established. Thereafter, the key service unit 1 indicates a called party number signal reception to the modem 43, and the modem 43 transmits a call to the selected data terminal 37l. When the selected data terminal 37l responds to the call from this modem 43, the key service unit 1 closes a communication channel between the modem 43 and the telephone line 25l, so that a communication link bet…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.