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| Number | Title | Issue Date |
| 6760339 | Multi-layer network device in one telecommunications rack The present invention provides a high switching capacity network device in one telco rack including both physical layer switch/router subsystems and an upper layer switch/router subsystem. Instead of providing a single physical layer switch/router subsystem, multipl... | 07/06/2004 |
| 6742134 | Maintaining a local backup for data plane processes The present invention provides a computer system having a control process and a device driver process that is in communication with the control process, and a local back-up process, independent of both the control process and the device driver process. The local bac... | 05/25/2004 |
| 6715097 | Hierarchical fault management in computer systems Computer systems and methods of data processing are disclosed in which hierarchical levels of fault/event management are provided that intelligently monitor hardware and software and proactively take action in accordance with a defined fault policy. A fault policy b... | 03/30/2004 |
| 6708291 | Hierarchical fault descriptors in computer systems Computer systems and methods of data processing are disclosed in which hierarchical descriptors define levels of fault/event management to intelligently monitor hardware and software and proactively take action in accordance with a defined fault policy. A fault poli... | 03/16/2004 |
| 6694450 | Distributed process redundancy A distributed software redundancy design is disclosed to minimize network outages and other problems associated with component/process failures by spreading software backup (in the so-called "hot state") across multiple elements. The distributed redundanc... | 02/17/2004 |
| 6671699 | Shared database usage in network devices The present invention provides methods for operating a computer system that call for executing a plurality of modular processes, providing a data file for use by the plurality of the processes, and incorporating a view identification within each of the pl... | 12/30/2003 |
| 6658580 | Redundant, synchronous central timing systems with constant master voltage controls and variable slave voltage controls The present invention provides a network device including redundant, synchronous central timing subsystems (CTSs) each having a voltage controlled timing circuit for receiving a constant master voltage signal and variable slave voltage signal. Each CTS al... | 12/02/2003 |
| 6658579 | Network device with local timing systems for automatic selection between redundant, synchronous central timing systems The present invention provides a network device including redundant, synchronous central timing subsystems (CTSs) and local timing subsystems (LTSs) including control circuits for automatically selecting between reference signals from both central timing ... | 12/02/2003 |
| 6654903 | Vertical fault isolation in a computer system The invention provides a method for fault isolation in a computer system, such as a network device. The method calls for providing a plurality of modular processes, and forming groups, based on hardware in the computer system, of one or more of the plural... | 11/25/2003 |
| 6639910 | Functional separation of internal and external controls in network devices The present invention provides a network device, such as a network switch or a router, having a high degree of modularity and reliability. The network device includes a data plane and a control plane. The data plane relays datagrams between a pair of rece... | 10/28/2003 |
| 6601186 | Independent restoration of control plane and data plane functions The present invention provides a computer system having a modular control process, and a modular device driver process that works in conjunction with the control process. The device driver process is capable of continuing operation even if the control pro... | 07/29/2003 |
| 6332198 | Network device for supporting multiple redundancy schemes The present invention provides a method and apparatus for supporting multiple redundancy schemes in a single network device. In one network device, various redundancy schemes are supported including 1:1, 1+1, 1:N, no redundancy or a combination of redunda... | 12/18/2001 |
