| ADTRAN, INC. Patent applications |
| Patent application number | Title | Published |
|---|
| 20120093002 | COMMUNICATIONS SYSTEM AND RELATED METHOD FOR REDUCING CONTINUITY CHECK MESSAGE (CCM) BURSTS IN CONNECTIVITY FAULT MANAGEMENT (CFM) MAINTENANCE ASSOCIATION (MA) - In accordance with a non-limiting example, a system and method minimizes collisions between transmitted connectivity fault management (CFM) packets. Maintenance association endpoints are formed from a plurality of network switch elements to form a maintenance association. The clocks between each network switch element within the maintenance association are synchronized. A unique transmission window is assigned to each maintenance association endpoint as part of the maintenance association. A respective CFM packet is transmitted as a continuity check message (CCM) within the unique transmission window. | 04-19-2012 |
| 20100124176 | AUTOMATIC NETWORK TOPOLOGY IDENTIFICATION BY NODES IN THE NETWORK - An automatic network topology identification technique is described herein. Each node in the network periodically or constantly transmits its unique address to its neighboring node. Once a node receives a different message from its neighbor, the node identifies a topology change in the network. In one embodiment, a current topology is associated with a session number. When a change in the topology is detected, the detecting node increments the session number and broadcasts the change in topology. The other nodes, detecting the changed session number, now know that there has been a change in the network. In response, the nodes in the network modify routing tables and other information stored at the node related to the topology. In one embodiment, the technique is used to reassign shortened addresses to each device on the network to support a dual-addressing mode of the network. The dual addressing mode substitutes reduced-length addresses (referred to as short addresses) for standard addresses (referred to as long addresses) for traffic whose source or destination is internal to a given virtual network topology. The required length of short addresses used for a given virtual topology is dependent on the number of devices reachable within the topology. | 05-20-2010 |
| 20100085098 | DIGITAL DELAY LINE DRIVER - Improved digital delay line driver is described. A delay line driver circuit includes elements to drive the delay line in one or multiple locations to provide a dynamic, adjustable slew rate on the output signal. The delay line driver circuit may also include active elements coupled to the transistors of the delay line to deactivate the delay line transistors substantially simultaneously, rather than cascading in series. Shutting off the delay line transistors substantially simultaneously reduces or eliminates crowbar or shoot through current on an edge transition of the output signal. | 04-08-2010 |
| 20090141656 | BANDWIDTH RESERVATION REUSE IN DYNAMICALLY ALLOCATED RING PROTECTION AND RESTORATION TECHNIQUE - The disclosed network includes two rings, wherein a first ring transmits data in a clockwise direction, and the other ring transmits data in a counterclockwise direction. The traffic is removed from the ring by the destination node. During normal operations (i.e., all spans operational), data between nodes can flow on either ring. Thus, both rings are fully utilized during normal operations. The nodes periodically test the bit error rate of the links (or the error rate is constantly calculated) to detect a fault in one of the links. The detection of such a fault sends a broadcast signal to all nodes to reconfigure a routing table within the node so as to identify the optimum routing of source traffic to the destination node after the fault. | 06-04-2009 |
| 20090141621 | BANDWIDTH RESERVATION REUSE IN DYNAMICALLY ALLOCATED RING PROTECTION AND RESTORATION TECHNIQUE - The disclosed network includes two rings, wherein a first ring transmits data in a clockwise direction, and the other ring transmits data in a counterclockwise direction. The traffic is removed from the ring by the destination node. During normal operations (i.e., all spans operational), data between nodes can flow on either ring. Thus, both rings are fully utilized during normal operations. The nodes periodically test the bit error rate of the links (or the error rate is constantly calculated) to detect a fault in one of the links. The detection of such a fault sends a broadcast signal to all nodes to reconfigure a routing table within the node so as to identify the optimum routing of source traffic to the destination node after the fault. | 06-04-2009 |
| 20090074413 | SYSTEM AND METHOD FOR PROVIDING TRANSPARENT LAN SERVICES - A system and method provide transparent LAN services in a metro-WAN environment to extend enterprise LANs over metro and wide area networks. The transparent LAN services generally provide customers with a layer two Ethernet connectivity with MAC learning capabilities. | 03-19-2009 |
