| Patent Number |
Title Of Patent |
Date Issued |
| D397673 |
Multiple position enclosure for electronics device |
September 1, 1998 |
|
| D394267 |
Modem |
May 12, 1998 |
|
| D384672 |
Modem |
October 7, 1997 |
|
| D384650 |
Multiple position enclosure for electronics device |
October 7, 1997 |
|
| D384649 |
Mini-tower enclosure for electronics device |
October 7, 1997 |
|
| D368097 |
Modem |
March 19, 1996 |
|
| D361570 |
Portable modem |
August 22, 1995 |
|
| D359287 |
Modem |
June 13, 1995 |
|
| D346607 |
Extender enclosure |
May 3, 1994 |
|
| D346606 |
Modem |
May 3, 1994 |
|
| D320389 |
Data communications peripheral |
October 1, 1991 |
|
| D318656 |
Data communications peripheral |
July 30, 1991 |
|
| D318655 |
Data communications peripheral |
July 30, 1991 |
|
| D314560 |
Modem or similar article |
February 12, 1991 |
|
| D309132 |
Modem or similar article |
July 10, 1990 |
|
| D304936 |
Modem or similar article |
December 5, 1989 |
|
| D304935 |
Modem or similar article |
December 5, 1989 |
|
| D269345 |
Modem |
June 14, 1983 |
|
| 5717870 |
Serial port controller for preventing repetitive interrupt signals |
February 10, 1998 |
| An improved input/output FIFO buffering device with expanded buffers for a universal asynchronous receiver/transmitter (UART) that includes scalable trigger levels for generation of an external service request is disclosed. Standard selectable trigger levels used in a type 16550 UART are |
| 5654983 |
Method and apparatus of operating data communications equipment in command mode and autobauding |
August 5, 1997 |
| A modem (20) receiving high speed digital data from data terminal equipment (10). The modem operates in a "software UART" state when in command mode. A high speed clock (30) is used to continually take samples of an incoming signal from a DTE (10). A microprocessor (40) multitasks betwee |
| 5627533 |
Adjusting encoding table size and memory allocation for data compression in response to input da |
May 6, 1997 |
| A real-time method for improving data compression. The correlation between data characters being provided a modem (10) is determined. Two measures are used to determine the correlation between data characters: the shape of tree(s) (6) in encoding table (16) and the compression ratio (96) |
| 5493648 |
Display update controller |
February 20, 1996 |
| A method for detecting high speed data received by a computer and for delaying displaying the receive data, thereby increase the microprocessor time devoted to receiving and storing the input data. Three parameters are utilized for determining when updating the display should be delayed |
| 5384770 |
Packet assembler |
January 24, 1995 |
| Method and apparatus for reducing latency delay associated with converting asynchronous, serial digital data to packet data. The number of data characters received before a time-out occurs are counted; the last character received before a time-out occurs is recognized; or the number |
| 5218683 |
Method and apparatus for concealing the enablement of a device by modifying a status word |
June 8, 1993 |
| A status word modification device. A serial communications device (11) contains two universal asynchronous receiver transmitters (UARTs) (14, 15). Each UART contains a first in, first out (FIFO) buffer (14a), two status buffers (14b, 14c), and a FIFO control register (14d). If the ap |
| 5179706 |
Method and apparatus for preventing bus contention problems between two processors |
January 12, 1993 |
| A bus access controller. An interface circuit (22) controls the access of a host computer (10) and a microprocessor (23) to one or more UARTs (14, 15). The microprocessor (23), which has no provision for waiting for a data transfer, is required to provide a signal of its intent to perfor |
| 5179661 |
Method and apparatus for serial data flow control |
January 12, 1993 |
| A data flow controller (150) for monitoring and automatically controlling the flow of serial data from a remote transmitter to a host device. A serial communications card (11) provides an interface between a remote transmitter connected to a serial port connector (20) and a host device |
| 5101320 |
Apparatus for rack mounting multiple circuit boards |
March 31, 1992 |
| An improved rack assembly is provided which includes an improved configuration for mounting multiple enclosed circuit boards. The rack assembly includes improvements in heat sinking power supplies incorporated within the assembly, relative adjustability of various elements of the rac |
| 5070514 |
Method and apparatus for clearing data path in half duplex modem receiver while maintaining dyna |
December 3, 1991 |
| A DSP receiver for a fast turnaround modem, particularly suited for a half duplex fast turnaround modem which prevents destruction of communication channel related adaptive equalizer parameters upon loss of carrier. Upon detection of carrier loss, after sufficient time has been allowed f |
| 5040194 |
Method and apparatus for providing for automatic gain control of incoming signals in a modem |
August 13, 1991 |
| An improved circuit for providing automatic gain control (AGC) for incoming phase shift keyed (PSK) and quadrature amplitude modulated (QAM) signals. An absolute value circuit (193) and a comparator (195) provide a first error signal (197). An integrater (200,202) smoothes the first erro |
| 5040192 |
Method and apparatus for optimally autocorrelating an FSK signal |
August 13, 1991 |
| An autocorrelator for FSK signals. An FSK signal, incoming on a telephone line is filtered by a bandpass filter (13) and sampled by an A/D converter (14). A sample clock (15) provides a fixed sampling frequency, FS. A first interpolating filter (20B) provides selectable delays which are |
| 5036527 |
Iterative automatic gain control for an analog front end of a modem |
July 30, 1991 |
| An apparatus and method is provided for detecting and amplifying the level of a received signal in the analog front end of a modem so as to maintain the level of the signal below a predetermined signal clipping level. An incoming signal is amplified by a predetermined amount of gain to p |
| 5018166 |
Method and apparatus for baud timing recovery |
May 21, 1991 |
| A data communications receiver for use in a modem. A fixed sample clock and a dominated tap tracking algorithm lock the local baud timing in the receiver to the baud timing in a remote transmitter. An interpolating filter provides a plurality of discrete delays. A filter control circuit |
| 5012489 |
Method for sending a plurality of data channels over a single communications line |
April 30, 1991 |
| A method for communicating with a plurality of hosts connected to an X.25 network and for selectably using a character as a control character or a data character. Each character received from the X.25 network is inspected to determine if it is one of a set of reserved characters. If so, |
| 5007020 |
Method for memory addressing and control with reversal of higher and lower address |
April 9, 1991 |
| An improved memory control and refresh apparatus as shown. For memory read operations, the read only memory and the random access memory are controlled by the NCSROM conductor (41) and the NCSRAM conductor (40), respectively, so that the read only memory and the random access memory do |
| 5001729 |
High speed half duplex modem with fast turnaround protocol |
March 19, 1991 |
| A phase locked loop circuit which eliminates the phase difference between an incoming reference signal and a sampling signal by sampling the incoming reference signal to produce a sampled signal. The sign of the sampled signal at two sample points is compared to determine in which qu |
| 4972436 |
High performance sigma delta based analog modem front end |
November 20, 1990 |
| An improved analog front end circuit for a high performance modem comprising an oversampling sigma delta modulator analog-to-digital converter which employs a novel four phase clocked MOSFET switched capacitor integrator. The integrator is switched in a manner as to eliminate signal |
| 4953210 |
Feature negotiation protocol for a synchronous modem |
August 28, 1990 |
| A method for feature negotiations between two synchronous modems. To engage in negotiations a modem must be configured to support synchronous operation, a data transfer rate of at least 4800 bits per second, and at least one non-default feature. After the orginating modem and the ans |
| 4938701 |
Connecting bracket for modular circuit boards |
July 3, 1990 |
| The present invention provides an interconnecting bracket for releasably connecting two circuit boards in an end-abutting relationship. The bracket is fastened to one circuit board in a relatively permanent manner, and is fastened to the second circuit board by the combination of a barbe |
| 4926448 |
Method and apparatus for implementing an escape sequence |
May 15, 1990 |
| A multi-port message buffer which is responsive to an escape sequence. A control unit controls whether the message buffer is in a transparent mode or a command mode with respect to a particular port. The control unit monitors a data port for the escape sequence and, if the escape sequenc |
| 4924441 |
Method and apparatus for refreshing a dynamic memory |
May 8, 1990 |
| An improved memory control and refresh apparatus as shown. For memory read operations, the read only memory and the random access memory are controlled by a signal on conductor (41) and a signal on conductor (40), respectively, so that the read only memory and the random access memory do |
| 4924346 |
Gas discharge surge suppressor for a telephone line |
May 8, 1990 |
| A gas discharge device is provided for protecting a telephone line from certain voltage surges. The gas discharge device provides low voltage surge protection from tip to ring but still retains higher voltage surge protection from tip or ring to ground. The device is a three terminal |
| 4910474 |
Method and apparatus for generating phase and amplitude modulated signals |
March 20, 1990 |
| An improved circuit for generating phase and amplitude modulated signals in a modem. A first circuit (161) generates a first signal (163) using a 1200 Hz carrier (160) and an input data stream (162). This signal (163) is generated at the rate of 7200 samples per second. The first signal |
| 4905282 |
Feature negotiation protocol and dynamically adjustable retraining sequence for a high speed hal |
February 27, 1990 |
| A feature negotiation protocol for synchronous operation and a dynamically adjustable retraining sequence. An originating modem, after completing conventional or standard handshaking sequences, sends a list of desired features to an answering modem. The answering modem either concurs wit |
| 4894847 |
High speed half duplex modem with fast turnaround protocol |
January 16, 1990 |
| A modem with improved signal processing and handshaking capabilities as described. Two digital signal processors are used to perform independent, concurrent operations so that a faster execution rate is obtained and more precise calculations are made possible. The modem also uses an impr |
| 4885758 |
Speed correction and stop bit control circuit for data communications device |
December 5, 1989 |
| A speed correction circuit for use in a modem implementing a data communications protocol having tighter tolerances on bit timing for the transmitted data than for the input data. Selective insertion and deletion of stop bits is used to compensate for overspeed or underspeed conditions |
| 4884269 |
Method and apparatus for connecting ISDN devices over an analog telephone line |
November 28, 1989 |
| A method and apparatus for allowing ISDN devices to communicate over an analog telephone line is shown. A first interface (12) accepts ISDN formatted data from an ISDN terminal equipment (TE) device (10), removes the D channel data from the ISDN data, and provides the D channel data to |
| 4873394 |
Receptacle panel for electronic device providing simple assembly and RFI suppression |
October 10, 1989 |
| An improved plate for mounting a plurality of receptacles on an electronics device, particularly a data communications peripheral, is disclosed. The plate is designed to be secured to an electronic subassembly which may be dropped into a portion of an enclosure and the plate placed proxi |
| 4868864 |
Autocorrelating 2400 bps handshake sequence detector |
September 19, 1989 |
| An improved V.22 bis 2400 bits per second (bps) handshake sequence detector. An incoming phase keyed (PSK) handshake sequence is autocorrelated using a frequency shift keyed (FSK) receiver (101). The autocorrelated signal is then filtered by a low pass filter (106). The autocorrelate |
| 4866215 |
Cable management system for equipment enclosure |
September 12, 1989 |
| A cable management system for directing cables connected to the back of an equipment enclosure of the type containing a computer peripheral device or other electronics apparatus to enter and exit the equipment enclosure at a selected one of a plurality of predetermined orientations. A bo |
| 4862167 |
Adaptive data compression method and apparatus |
August 29, 1989 |
| A method and apparatus for compressing data, particularly useful in a modem. The preferred method is implemented in a microprocessor within a modem, and dynamically adapts to changing data statistics. Parallel encoding and decoding tables are provided at the encoder and the decoder, |
