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| Number | Title | Issue Date |
| 6088331 | Parallel service-rate controllers in ATM switches Techniques of service-rate controls in ATM switches are described, and apparatus for their implementation are devised. The techniques fall in two categories: frequency domain controls, and time-domain controls. The regulators control the service rate on a... | 07/11/2000 |
| 6088452 | Encoding technique for software and hardware An encoding technique of the invention protects software programs and hardware designs from being copied, tampered with, and its functions from being exposed. The software programs and hardware designs (collectively called programs) thus encoded still rem... | 07/11/2000 |
| 5954799 | Access to telecommunications networks in a multi-service environment by mapping and exchanging control message between CPE adaptors and access server In current voice telephony, CATV, and wireless networks, traffic is channelized for both access and transport, requiring a dedication of a fixed bandwidth end-to-end for the duration of a service connection. This channelization is wasteful of resources wh... | 09/21/1999 |
| 5937058 | Coordinating telephones or adjuncts on the same loop When two or more telephone sets are in use on the same subscriber's loop, their activities may not be properly detected or monitored by the central office switch. The present invention provides a method of and an apparatus for coordinating activities so t... | 08/10/1999 |
| 5862126 | Connection admission control for ATM networks In an ATM network, the physical resources are shared by many connection and the bandwidth is allocated virtually to each connection. The connection admission control (CAC) algorithm uses traffic descriptors, desired quality of service (QOS) parameters etc... | 01/19/1999 |
| 5828666 | Access to telecommunications networks in multi-service environment In current voice telephony, CATV, and wireless networks, traffic is channelized for both access and transport. This channelization is wasteful of resources where multiple services have varying demands for bandwidth and holding times, or a service generate... | 10/27/1998 |
| 5802043 | Transport architecture and network elements A novel transport architecture and network elements use nodes in a ring or virtual ring configuration. Information is exchanged among the nodes in a continuous series of containers carried in a superframe. A container is assigned to a destination node and... | 09/01/1998 |
| 5754530 | Flow control of ABR traffic in ATM networks An ATM network carries several categories of services, each having its own traffic characteristics and performance requirements. The ABR (available bit rate) service category is the only existing one suited for high-reliability data communications, such a... | 05/19/1998 |
| 5748741 | Encoding technique for software and hardware An encoding technique of the invention protects software programs and hardware designs from being copied, tampered with, and its functions from being exposed. The software programs and hardware designs (collectively called programs) thus encoded still rem... | 05/05/1998 |
| 5745486 | High capacity ATM switch An ATM switch architecture expandable to multi-terabits/s uses data transfer in a heterogeneous burst of a constant length. It employs rotators connecting stages in a three-stage switch configuration. In one embodiment, the cells are sorted at ingress and... | 04/28/1998 |
| 5745577 | Symmetric cryptographic system for data encryption A novel symmetric cryptographic system for data encryption uses two different sets of (m×n) s-boxes in its round function in one embodiment, where m and n are different integers. It also includes a set of expansion boxes to expand a half data block in a ... | 04/28/1998 |
| 5740159 | Loopback mechanism for frame relay OAM A loopback mechanism uses frame relay OAM loopback frames which eliminate the need for location identifiers and reduces overhead and complexity. The frames replace source and destination loopback location identifiers by a loopback indicator field, a send ... | 04/14/1998 |
| 5699431 | Method for efficient management of certificate revocation lists and update information A method which allows implementation of the revocation of public-key certificates facilitates engineering of certificate revocation lists (CRLs). It solves the practical problem of CRLs potentially growing to unmanageable lengths by allowing CRLs to be se... | 12/16/1997 |
| 5629930 | Call routing in an ATM switching network A routing scheme for an ATM switching network includes a plurality of switching nodes, each of which includes individual storage for storing routing messages for each outgoing link. A call at a source node is routed through one possible routing path which... | 05/13/1997 |
| 5610910 | Access to telecommunications networks in multi-service environment In current voice telephony, CATV, and wireless networks, traffic is channelized for both access and transport. This channelization is wasteful of resources where multiple services have varying demands for bandwidth and holding times, or a service generate... | 03/11/1997 |
| 5566162 | Method of sectionalizing trouble on telecommunication network connections In telecommunications involving more than one network, it is important to determine the location of a fault which may occur on a connection so that the responsible network administrator can be identified and appropriate remedial measures can be promptly p... | 10/15/1996 |
| 5511123 | Symmetric cryptographic system for data encryption A novel symmetric cryptographic system for data encryption using novel partially bent-function-based (m×n) substitution boxes (s-boxes), where m and n are positive even numbers, m | 04/23/1996 |
| 5499239 | Large capacity modular ATM switch A large capacity ATM switch is constructed in a matrix of a plurality of modules which are connected by high speed buses. Each module includes an I/O port for external access to the switch. Data are exchanged between I/O ports in trains of continuous ATM ... | 03/12/1996 |
| 5497371 | Digital telecommunication link for efficiently transporting mixed classes of packets An efficient packet transport system for mixed traffic in which a packet fragmentation protocol allows traffic of different classes to occupy a single physical link. In one embodiment, packet fragmentation gives delay sensitive traffic priority over non-s... | 03/05/1996 |
| 5481613 | Computer network cryptographic key distribution system Novel cryptographic key distribution techniques to be used in large computer networks are disclosed. The techniques require trusted key release agent systems in each security domain. The encryptor of a data message nominates the set of authorized decrypto... | 01/02/1996 |
| 5475679 | Large capacity ATM switch A large capacity ATM switch includes a space switch core connecting input buffer modules and output buffer modules by way of high speed links. Upon request from an input buffer module, the space switch core sets up a connection to a desired output module.... | 12/12/1995 |
| 5471650 | Radio link parameter control in wireless personal communications system In personal communications systems, a wireless handset user is not generally aware of the quality of the radio link to the base station when a call is in progress. Novel mechanisms are disclosed by which the handset user is given up-to-date information co... | 11/28/1995 |
| 5463673 | In-building radio deployment technique for wireless personal communications systems A novel in-building radio deployment technique is disclosed. Wireless personal communications systems will see a large growth in public acceptance. Presently, deployment of a personal communications system in a building is a time consuming and costly proc... | 10/31/1995 |
| 5450394 | Delay monitoring of telecommunication networks Novel techniques are disclosed for continuously monitoring parameters of delay between two nodes in a telecommunication network such as an ATM or frame relay network. The techniques use measurement cells, i.e. test cells, test frames, performance manageme... | 09/12/1995 |
| 5444608 | High frequency power distribution system Novel high frequency power distribution systems are disclosed. The system of the present invention uses a relatively high frequency AC (e.g. 100 kHz or higher) and distributes it by a high frequency bus which includes magnetic coupling. AC/DC converters a... | 08/22/1995 |
| 5438497 | Tertiary side resonant DC/DC converter Resonant DC/DC converters are disclosed. The DC/DC converters according to the present invention include a bridged inverter, a resonant circuit, a high frequency transformer and a rectifying circuit. The high frequency transformer has a tertiary winding. ... | 08/01/1995 |
| 5436590 | Digital FSK demodulator with automatic offset cancellation A digital FSK demodulator used in e.g. a telephone loop produces unequal amplitudes in detected mark and space tones. The inequality or offset must be cancelled so that a proper timing signal can be recovered from the FSK signal. The demodulator includes ... | 07/25/1995 |
| 5436886 | ATM switch in dual switch plane operation A novel ATM switch of dual switch plane operation and method of switching traffic in unit cells among ports in dual switch planes are disclosed. The ATM switch of the invention is plane protected in that a redundant switch plane is provided. In the switch... | 07/25/1995 |
| 5430728 | Single-route broadcast for LAN interconnection In LAN interconnect, it is necessary to perform route discovery to locate a destination device. A novel method of selecting designated source routing bridges and a new single-route broadcast scheme using those selected bridges are disclosed. The invention... | 07/04/1995 |
| 5412647 | Rate enforcement for frame relay networks A Frame Relay network must implement a rate (bandwidth) enforcement function at the access in the network so that service subscription violation by some users will not cause performance or throughput degradation of other users' service. A novel rate enfor... | 05/02/1995 |
| 5394109 | Digital FSK demodulator with offset cancellation A digital FSK demodulator includes a quadrature phase detector for detecting space and mark tones used in FSK signals. Due to its inherent characteristics, a telephone loop in which the demodulator is used produces unequal amplitudes in detected mark and ... | 02/28/1995 |
| 5390184 | Flexible scheduling mechanism for ATM switches A novel flexible scheduling mechanism which can be used in an ATM switch is disclosed. The new scheduling mechanism allows an ATM switch to handle ATM as well as STM traffic. Video, voice, and data traffic have different service requirements. It is desira... | 02/14/1995 |
| 5374887 | Inrush current limiting circuit An inrush current limiting circuit contains an FET as an active component which is controlled by a network of passive components. The network includes a gate control circuit for controlling the operation of the FET and a negative feedback circuit which re... | 12/20/1994 |
| 5369801 | Antenna diversity reception in wireless personal communications An antenna diversity technique for use in wireless personal communications is disclosed. In the so called microcellular phone environment, fading in signal reception is an important consideration. A new way of performing the antenna diversity involves ant... | 11/29/1994 |
| 5367200 | Method and apparatus for measuring the duty cycle of a digital signal The technique of measuring the duty cycle of a digital signal of known repetition rate is disclosed. It makes use of the fact that the probability of the digital signal being at the high level is related to its duty cycle when the signal is sampled at a f... | 11/22/1994 |
| 5353282 | Local area network embedded in the communication switch core Local area networks which take advantage of the star configuration of the switched telecommunication networks are disclosed. The local area networks of the present invention use a small part of the central memory of the switch core and employ either centr... | 10/04/1994 |
| 5349457 | Fiber optic telephone loop network Novel fiber optic telephone loop networks are disclosed. In the networks, single mode fiber optics are used for feeder and distribution segments of the loop but multimode fiber optics are used for the drops. The use of the multimode fiber optics has permi... | 09/20/1994 |
| 5325223 | Fiber optic telephone loop network Novel fiber optic telephone loop networks are disclosed. In the networks, single mode fiber optics are used for feeder and distribution segments of the loop but multimode fiber optics are used for the drops. The use of the multimode fiber optics has permi... | 06/28/1994 |
| 5272696 | ATM plane merging filter for ATM switches and the method thereof Many telecommunication switches operate in dual plane mode for better reliability and maintainability. For ATM switches, it has been difficult to merge cells emerging from two identical planes because of the non-synchronous nature of transmission. An ATM ... | 12/21/1993 |
| 5241536 | Broadband input buffered ATM switch Broadband ATM switches for switching ATM packetized data in timeslots are disclosed. In one embodiment, the switch includes input buffer, a space switch for connecting input ports and output ports at successive timeslots and a system scheduler. The timesl... | 08/31/1993 |
