The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 28, 1998
Filed:
Jan. 08, 1997
Robert Earl Scott, Indian Rocks Beach, FL (US);
E Robert Lastinger, Jr, Lithia, FL (US);
Paradyne Corporation, , US;
Abstract
A cellular data gateway situated at a mobile telecommunications switching office (MSC) is provided for interconnecting an originating mobile modem of an analog cellular system to an answer modem of a public switched telephone network (PSTN) when one of the either the cellular side or the PSTN side of the connection is capable of a fast connection sequence. The cellular data gateway comprises a quick connect cellular modem connected to the MSC and configured for interfacing with the originating mobile modem. The cellular data gateway further includes a PSTN modem connected to the MSC and configured for interfacing with the answer modem of the PSTN. The cellular modem and the PSTN modem are interconnecting in the cellular data gateway as a back-to-back modem pair. As an important part of the invention, the cellular modem includes a mechanism for delaying the initiation of a fast connect sequence with the originating mobile modem until the PSTN modem has established a connection with the answer PSTN modem. The connection of the PSTN modems is preferably signaled to the cellular modem by a carrier detect (CD) signal, that is, at the establishment of the physical layer connection. This essentially ensures that the cellular side of the connection (between the originating mobile modem) and the cellular modem and the PSTN side of the connection (between the PSTN modem and the answer PSTN modem) have substantially synchronized connect messages. Alternatively, the connection of the PSTN modems can be signaled to the cellular modem by a connect signal from the PSTN modem.