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| Number | Title | Issue Date |
| 5784558 | Method and apparatus for testing of extended ISDN BRI service An enhanced ISDN-DP transmission device of the present invention allows for testing of ISDN-protocol communication paths using an existing DDS-protocol test infrastructure. The ISDN-DP unit receives a DDS test command and determines whether the command wa... | 07/21/1998 |
| 5748637 | DTMF signaling on four-wire switched 56 KBPS lines Dual tone multi-frequency (DTMF) address signaling on four-wire switched 56 kilobits per second (Kbps) service lines is obtained by determining the proper byte boundary information. An iterative learning process is used with an existing digital switching ... | 05/05/1998 |
| 5726986 | Digital communication system with intelligent channel units In a time division multiplex digital communication system, access devices are capable of generating and detecting data sequences that are normally suppressed by end user equipment for establishing in-band communications between the access device and selec... | 03/10/1998 |
| 5673265 | Scalable multimedia network A Scalable Multimedia Network providing integrated networking of data, voice, video and image services over a variety of access facilities including metallic loops, fiber/coax or digital fiber is disclosed herein. The SMN establishes customer initiated sw... | 09/30/1997 |
| 5555244 | Scalable multimedia network A Scalable Multimedia Network providing integrated networking of data, voice, video and image services over a variety of access facilities including metallic loops, fiber/coax or digital fiber is disclosed herein. The SMN establishes customer initiated switche... | 09/10/1996 |
| 5553059 | Network interface unit remote test pattern generation A system for isolating the direction of communication errors in the local loop of a digital data network is described. A Network Interface Unit (NIU) located at the customer premises typically has a loopback feature, allowing for Bit Error Rate Tests (BER... | 09/03/1996 |
| 5473329 | Performance monitoring for loops Loop Performance Monitoring (LPM) for DDS loops is described. Even though DDS loops have Intentional Bipolar Violations (BPVs), a Loop Coding Violations (LCVs) detection strategy based on further processing of BPVs is described. By monitoring LCVs a local... | 12/05/1995 |
| 5457690 | DTMF Signaling on four-wire switched 56 Kbps Lines Dual tone multi-frequency (DTMF) address signaling on four-wire switched 56 kilobits per second (Kbps) service lines is obtained by determining the proper byte boundary information. An iterative learning process is used with an existing digital switching ... | 10/10/1995 |
| 5434866 | Digital communication system with intelligent channel units In a time division multiplex digital communication system, access devices are capable of generating and detecting data sequences that are normally suppressed by end user equipment for establishing in-band communications between the access device and selec... | 07/18/1995 |
| 5394145 | Performance monitoring for loops Loop Performance Monitoring (LPM) for DDS loops is described. Even though DDS loops have Intentional Bipolar Violations (BPVs), a Loop Coding Violations (LCVs) detection strategy based on further processing of BPVs is described. By monitoring LCVs a local... | 02/28/1995 |
| 5301207 | Test apparatus and process for digital data service system Loop circuits lacking byte alignment are tested by test equipment signals at 9.6 kbps transmitted over a DS$c; format 19.2 kbps communication network. Upon indication of loss of 19.2 kbps framing, return signals from the loop are reformatted into a 9.6... | 04/05/1994 |
| 5285450 | Inband communications in a digital communications system In a digital communication system, select devices are capable of generating and detecting data sequences that are normally suppressed by end user equipment for establishing inband communications among the select devices. Select devices capable of particip... | 02/08/1994 |
| 5144624 | Direct digital access telecommunication system with signaling bit detection In a telecommunication system, a circuit is provided for determining the system mode and for restoring converted signalling bits. The circuit is designed to be used in a telecommunication system that lacks frame alignment. The circuit may serve as an trun... | 09/01/1992 |
| 5113391 | Intelligent channel unit An Intelligent Channel Unit for interfacing end user stations to a DDS digital data communications network and for processing network and end user data according to digital data communications applications is described. The ICU comprises data processing c... | 05/12/1992 |
| 5099473 | Port concentrator A port concentrator communication system which allows a large number of end user stations to share a limited number of trunk lines to a packet switch network is described. Specifically, the system comprises a number of end user stations each coupled to a ... | 03/24/1992 |
| 5060259 | Call progress capability for a switched channel data service unit A method and apparatus is provided within an interface to data terminal equipment for obtaining call progress information. The call progress information provides relevant data as to the progress of a call initiated by the data terminal equipment. The inte... | 10/22/1991 |
| 5058129 | Two-wire digital transmission loop A quadrature coder for a two-wire digital loop communication system is described in which data is sampled and quadrature encoded by being divided into two bit streams, one of which comprises every other bit in the original bit stream and the other one com... | 10/15/1991 |
| 5025443 | Digital data over voice communication A method and apparatus is described for transmitting and receiving data signals and voice band signals over a single pair of wires, wherein the energy content of the data signals in the voice band is transferred to a higher frequency to avoid interference... | 06/18/1991 |
| 5014307 | Method and apparatus for echo canceler disablement An echo canceler is disabled by sending two signals to it or in the alternate, by sending a single signal. The two signals are bit shifted replicas of each other. The nature of the sequence of the bits within the signals assures that one of the two signal... | 05/07/1991 |
| 4995076 | Call progress capability for a switched channel data service unit A means is provided within an interface to data terminal equipment for obtaining call progress information. The call progress information provides relevant data as to the progress of a call initiated by the data terminal equipment. The interface is design... | 02/19/1991 |
| 4953160 | Digital data over voice communication A method and apparatus is described for transmitting and receiving data signals and voice band signals over a single pair of wires, wherein the energy content of the data signals in the voice bands is transferred to a higher frequency to avoid interferenc... | 08/28/1990 |
| 4887278 | Equalizer for digital transmission systems A post-equalizer and pre-equalizer circuit for use in communicating between nodes in a pulse amplitude modulated digital communication system is described. The post-equalizer circuit comprises a first variable zero circuit, a second variable circuit, and ... | 12/12/1989 |
| 4862480 | Digital data service system A digital data service transmission system is described in which 19.2 kbps data rate AMI encoded local loop signals are formatted for reliable transmission at 64 kbps rates over unqualified digital facilities and re-formatted for entry into DDS network hi... | 08/29/1989 |
| 4849972 | Digital data communications terminal and modules therefor A line interface module and selected channel unit modules are replaced in a digital terminal which couples time multiplexed digital communications lines to a plurality of voice signal lines. The line interface unit is provided with means for responding to... | 07/18/1989 |
| 4745622 | Equalizer for digital transmission systems A post-equalizer and pre-equalizer circuit for use in communicating between nodes in a Pulse Amplitude Modulated (PAM) digital or analog communication system is described. The post-equalizer circuit comprises a first variable zero circuit, a second variab... | 05/17/1988 |
