| Patent Number |
Title Of Patent |
Date Issued |
| 5724413 |
Host computer digital signal processing system for communicating over voice-grade telephone chan |
March 3, 1998 |
| A conventional computer is coupled to an analog telephone transmission link by an analog/digital conversion interface adapter. Modem transmission is accomplished by performing the modulation and demodulation functions digitally in the computer's existing processor which executes programs |
| 5579305 |
Asymmetric duplex modem utilizing narrow band echo cancellation |
November 26, 1996 |
| A full-duplex modem having improved transmission speeds over voice grade telephone circuits that extends the concepts of asymmetric transmission to include echo cancellation techniques. The preferred modem has a high speed forward channel and an overlapping low speed back channel and is |
| 5577105 |
Telephone call routing and switching techniques for data communications |
November 19, 1996 |
| A method of processing incoming digital telephone calls from remotely located call originators which are destined for receipt by a host computer system. The host computer system is linked to the telephone network by a network access server. The call originators may be any type of data |
| 5535014 |
Method for maintaining a communication link with a facsimile modem |
July 9, 1996 |
| A method for allowing data communication equipment, such as a facsimile modem, to communicate in a more reliable manner with a facsimile machine. The data communication equipment is interconnected to data terminal equipment, such as a personal computer. The data terminal equipment may |
| 5528595 |
Modem input/output signal processing techniques |
June 18, 1996 |
| Apparatus and method for enabling bilateral transmission of digital data between a local area network and telephone company networks employing both analog and digital telephone lines. A modem modulates signals responsive to signals from a local area network representing an outgoing call |
| 5515398 |
Modem line probing signal techniques |
May 7, 1996 |
| Techniques for generating a line probing signal. The probing signal is comprised of a plurality of different tones, where the tones have a predetermined phase relationship. The signal may be sent over a communication channel, such as a telephone line. By so using the line probing sig |
| 5472351 |
Personal computer modem card interface construction |
December 5, 1995 |
| A construction for an interface between a computer and a transmission medium, such as a telephone line. A memory card may be inserted into the computer and interconnected to an interface module, such as a direct access arrangement, which, in turn, is interconnected to a telephone line. |
| 5438614 |
Modem management techniques |
August 1, 1995 |
| Apparatus and method for managing transmission of digital data between a digital telephone line and a computer network. First and second modems, a telephone control circuit and a network control circuit respond to management instruction signals to execute predetermined management obj |
| 5438536 |
Flash memory module |
August 1, 1995 |
| A module incorporating flash memory chips. An interface enables power down of the chips in response to a power down signal and provides an interrupt signal indicating when all of the ready lines from the memory chips are in a ready state, thereby reducing the need for polling the status |
| 5416776 |
Modem backplane techniques |
May 16, 1995 |
| An improved backplane apparatus for transmitting signals to and from a modem system. The modem system includes more than one modem for transmitting data via at least one telephone line and via at least one network. The modem system has a first bus for management signal communication |
| 5008901 |
Asymmetrical duplex error-controlled modem |
April 16, 1991 |
| A modem for connecting data terminal equipment (DTE) to a remote DTE via a general switched telephone network or leased lines at data rates of 300, 1200 and 2400 bps using standard modulation techniques, and additonally providing virtual full duplex transmission capability at 9600 bps us |
