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| Number | Title | Issue Date |
| 6078595 | Timing synchronization and switchover in a network switch A data communications switch and method of operation are presently disclosed enabling flexible, selectable provision of a common timing signal for synchronized external communication through physical layer interfaces with other network devices, synchroniz... | 06/20/2000 |
| 6034943 | Adaptive communication node for use in an inter-processor communications system A communication node, for use in an inter-processor communication system in an asynchronous transfer mode switching system, provides two independent paths to upper layer switching modules for two duplicated processors, respectively, wherein the path from ... | 03/07/2000 |
| 6034961 | Active/standby routing system on ATM network In an active/standby routing system for establishing an active route and the corresponding standby route in an ATM network, a node transmits, as a connection signaling message, a connection pair identifier which is unique to a combination of the active an... | 03/07/2000 |
| 6009075 | Transport interface for performing protection switching of telecommunications traffic A transport interface (10) provides add drop multiplex functionality and termination requirements for the transportation of network traffic. The transport interface (10) includes high speed units (12), broadband interfaces (16), and SONET formatters (18).... | 12/28/1999 |
| 5982745 | LAN bridging redundancy In a method implementing redundancy in LAN/WAN bridging/switching elements, LAN/WAN traffic is sent to active and inactive elements using multicast techniques. The active element bridges the data traffic and the inactive drops it.... | 11/09/1999 |
| 5940410 | Method of transmitting data reliably over N normal channels, and over at least one back-up channel, and a transmit end station, a receive end station, and a relay station corresponding to the method The invention concerns a method of transmitting data reliably over N normal channels (3), where Nࣙ1, and over at least one back-up channel (4), between a transmit end station (1) and a receive end station (2), the data transmitted comprising both traffi... | 08/17/1999 |
| 5909427 | Redundant switch system and method of operation A redundant switch (50) is provided for performing a switch fabric test. The redundant switch (50) includes a foreground switch fabric controller (24) for controlling a foreground switch fabric (26), a background switch fabric controller (124) for control... | 06/01/1999 |
| 5896370 | Signal protection and monitoring system A redundancy switch (44) provides interfacing of network signals to spare network processors (46) in the event of a failure of a main network processor (42). A redundancy switch (44) allows for monitoring and diagnostic operations to be performed on netwo... | 04/20/1999 |
| 5896381 | Instantaneous switching unit and switching method for delay/priority control buffer An instantaneous switching unit for a delay/priority control buffer comprises an operational buffer and a standby buffer, wherein, upon detecting phase adjustment cell out of received signal cell, the operational buffer recognizes the amount of main signa... | 04/20/1999 |
| 5878025 | ATM switch and method for switching path by ATM switch A plurality of switching modules arrayed in a plurality of columns and in at least one row switch over paths in accordance with path data contained in cells to transfer inputted data to a target line on the cell-unit. One or more path switching units are ... | 03/02/1999 |
| 5870382 | Automatic protection switching system for ATM exchange network An ATM exchange network system in which a first equipment and a second equipment are connected through a duplex communication line comprising a working line and a protection line. In this system, each of the first equipment and second equipment provides: ... | 02/09/1999 |
| 5828651 | Device for duplicating connectionless server A device for duplicating a connectionless server whose reliability and performance are improved includes a physical hierarchy processor for converting connectionless input data into an electric signal, outputting the matching signals by ATM physical hiera... | 10/27/1998 |
| 5761405 | Data integrity guarantee system The main storage, the communication interface portion and the circuit control module hold transmission data in the buffers until completion of the transmission has been confirmed. When a fault has occurred in the current operating system of the duplexed p... | 06/02/1998 |
| 5754527 | Line switching apparatus A line switching apparatus is applied to a system which has a current system line and a spare system line, transmits identical ATM cell streams via the two lines, and adds protection switching cells to the ATM cell streams on a transmission side when line... | 05/19/1998 |
| 5740157 | Distributed control methodology and mechanism for implementing automatic protection switching Redundant facility payload signals (12, 14) received by redundant interface modules (16, 18) are redundantly provided (28, 30; 32, 34) to redundant downstream modules (24, 26) in an equipment (10). A non-symmetrical facility protection algorithm is reside... | 04/14/1998 |
| 5732069 | ATM switch The ATM switch includes a switch network section, a common section and an individual interface section. The ATM switch system can reduce a cost by sharing the common section in both cases of employing a simplex and a duplex individual interface sections. ... | 03/24/1998 |
| 5671214 | System for processing synchronization signals with phase synchronization in a mobile communication network For synchronization signals of zeroth and first series, a synchronization signal processing system comprises synchronization trunk device of the zeroth and the first series (77(0), 77(1)) for producing particular signals of the zeroth and the first series... | 09/23/1997 |
| 5668808 | Path route retrieval method in a time multiplexer network Transmission line interfaces 300 and 400, terminal interfaces 100 and 200 and a time switch (TSW) 500 are controlled by a controller 600'. The controller 600' includes a communication means circuit 70 for communication with the controllers of other statio... | 09/16/1997 |
| 5663949 | Line protection switching system in duplexed fiber interface shelf A line protection switching system of a duplexed fiber interface shelf makes easily to reconcile conditions of duplexed fiber interface shelves, which perform line switching by employing APS bytes on an ISDN network. The line protection switching system h... | 09/02/1997 |
| 5610913 | Switching equipment for performing a switching operation for a high-speed packet in broadband Integrated Services Digital Network Switching equipment in provided for performing a switching process of a fixed length cell consisting of data and a cell header. A line interface provided in the switching equipment accommodates a plurality of lines and, at the same time, processes the dat... | 03/11/1997 |
| 5581542 | Device and method of performing a switching control to standby system in hybrid system of duplex system and backup line In a device and a method for performing a switching control to a standby system in a hybrid system including a duplex system and a backup line, communication is performed without using a backup line when a line is switched in an exchange. The device inclu... | 12/03/1996 |
| 5561661 | Method for synchronizing redundantly transmitted message cell streams In a cell-oriented communication network (ATMN), respective control cells are inserted at predetermined time intervals into two message cell streams redundantly transmitted via a path pair (EP,AP). The control cells respectively contain a sequence number ... | 10/01/1996 |
| 5488606 | Procedure for switching-over systems An ATM (asynchronous transfer mode) exchange has a buffer for system #0 and a buffer for system #1 providing P-MEM's for storing data including an A bit and for a VCI/VPI currently in use is set to "1'. Upon detecting a switchover between the systems, eve... | 01/30/1996 |
| 5475675 | Apparatus and method for non-stop switching in asynchronous transfer mode According to the present invention, when a current system is switched to a spare system in a transmission system in an asynchronous transfer mode, empty cells transmitted in the current and spare systems are detected, and thereby a timing for switching th... | 12/12/1995 |
| 5473599 | Standby router protocol A system and protocol are provided for routing data packets from a host on a LAN through a virtual address belonging to a group of routers. The host is configured to point to the virtual address so that the packets it sends out of its LAN are always direc... | 12/05/1995 |
| 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 |
| 5414696 | Cell exchanging apparatus An ATM cell exchanging apparatus includes an ATM cell switch for a first system #1 and an ATM cell switch for a second system. These cell switches distribute input cells to appropriate output lines. The system also includes selectors for switching the ATM... | 05/09/1995 |
| 5408464 | System administration in a flat distributed packet switch architecture A packet switch with a plurality of processing modules (PMs) interconnected via a shared transmission medium is provided with a flat distributed architecture so that each PM has the capability of exclusive control of establishing a path for a user connect... | 04/18/1995 |
| 5398235 | Cell exchanging apparatus A cell exchanging apparatus which distributes cells input through a plurality of input lines to output lines by destination for output. Without stopping the operation of the cell exchanging apparatus, active and standby cell switches of the cell exchangin... | 03/14/1995 |
| 5377182 | Non-blocking crossbar permutation engine with constant routing latency The invention is embodied in an N×N crossbar for routing packets from a set of N input ports to a set of N output ports, each packet having a header identifying one of the output ports as its destination, including a plurality of individual links which c... | 12/27/1994 |
| 5325358 | Method and circuit arrangement for transmitting message packets via packet switching equipment, the message packets being transmitted on output trunks Message packets are transmitted via a packet switching equipment which comprises at least two redundant switching matrices to output ports connected thereto, the message packets comprising a packet header identifying a respective virtual connection and be... | 06/28/1994 |
| 5301184 | Control system for switching duplicated switch units in ATM exchange In a control system for switching between a first system and a second system of a duplicated selecting structure in an ATM exchange, one of the first and second systems operates as an active system, and the other operates as a standby system. A generator ... | 04/05/1994 |
| 5295133 | System administration in a flat distributed packet switch architecture A packet switch with a plurality of processing modules (PMs) interconnected via a shared transmission medium is provided with a flat distributed architecture by which each of the PMs has the capability of exclusive control of establishing a path for a use... | 03/15/1994 |
| 5283782 | System switching method and apparatus without loss of signal in cell switching system of asynchronous transfer mode In a communication apparatus using an asynchronous transfer mode, there is provided a system switching method, and apparatus, without loss of signal for performing cell multiplexing or cell switching in a duplex system including a primary system and a sta... | 02/01/1994 |
| 5274633 | Switching system for ATM dual switch system The present invention relates to a system switching system in an exchange system in which an ATM switch for exchanging asynchronous transfer mode (ATM) cells is duplexed. In order to switch between ATM switches accurately with drop-out and overlap of cell... | 12/28/1993 |
| 5200950 | Method and circuit arrangement for reducing the loss of message packets that are transmitted via a packet switching equipment In order to reduce the loss of message packets that are transmitted in the course of virtual connections in an asynchronous transfer mode and which comprise a packet header identifying the respective virtual connection, the message packets being respectiv... | 04/06/1993 |
| 5153578 | Apparatus and method for establishing identical data in dual ATM switches An ATM switching system includes two ATM switches which are the same as each other. Each of the ATM switches includes a switch buffer, and a cell counter which indicates the number of cells in the switch buffer. Each of the ATM switches also includes a di... | 10/06/1992 |
| 5131041 | Fault tolerant interconnection networks A multi-stage, alternate routing switching network is enhanced with a switch architecture that is able to detect and mask all single faults. The switch employs a controller that develops dual rail control signals. In one embodiment, the controller is made... | 07/14/1992 |
| 4525830 | Advanced network processor An advanced network processor or concentrator which uses distributed processing to interface a plurality of subscriber data input lines to a packet network. The concentrator includes removable line terminators boards (ULT) which can be configured to handl... | 06/25/1985 |
| 4442502 | Digital information switching system A digital information switching system features modular design with dispersed processing in which data is switched locally in one of a plurality of remote switching units for connection between local terminals, and data to be exchanged between terminals c... | 04/10/1984 |
