Method and system for VMAN protocol
Granted: September 9, 2003
Patent Number:
6618388
A method and system is provided in which MAN traffic is segregated at a customer and a provider domain level. A switch at the edge of the MAN encapsulates a data packet in a new header, which is used to specify the customer domain tags. The data packet is encapsulated further in another new header, which is used to specify new VMAN tags. The nested encapsulation is repeated as necessary until the data packet is forwarded to a remote switch at the edge of the MAN in accordance with the…
Ejector assembly
Granted: July 22, 2003
Patent Number:
6597584
An ejector assembly is provided. The ejector assembly is detachably coupled to a circuit board to allow the circuit board to be locked in a chassis and separated from the chassis. The ejector assembly comprises a base portion and a locking portion. The base portion is rotatably coupled to the circuit board via a connector. The locking portion is capable of locking the circuit board into place when the ejector assembly is moved from a first position to a second position while the circuit…
Data path architecture for a LAN switch
Granted: September 25, 2001
Patent Number:
6295299
A packet switching device having a central shared memory and a number of medium access controllers each coupled to a communications medium to exchange data packets therewith, and a controller coupled to each medium access controller via a data path to exchange data packets with the media access controller. The controller has a number of data path controllers each connected to each medium access controller via a separate and like portion of the data path to exchange a corresponding…
Policy based quality of service
Granted: August 15, 2000
Patent Number:
6104700
A flexible, policy-based, mechanism for managing, monitoring, and prioritizing traffic within a network and allocating bandwidth to achieve true quality of service (QoS) is provided. According to one aspect of the present invention, a method is provided for managing bandwidth allocation in a network that employs a non-deterministic access protocol, such as an Ethernet network. A packet forwarding device receives information indicative of a set of traffic groups, such as: a MAC address,…
Sliced comparison engine architecture and method for a LAN switch
Granted: March 7, 2000
Patent Number:
6034957
A packet switching device having a central shared memory and a number of medium access controllers each coupled to a communications medium to exchange data packets therewith, and a controller coupled to each medium access controller via a data path to exchange data packets with the media access controller. The controller has a number of data path controllers each connected to each medium access controller via a separate and like portion of the data path to exchange a corresponding…
Network interconnect device and protocol for communicating data among packet forwarding devices
Granted: February 8, 2000
Patent Number:
6023471
A network interconnect device and message exchange protocol for forwarding data among packet forwarding devices are provided. According to one aspect of the present invention, data is forwarded between a first and second packet forwarding device coupled to an interconnect device. The interconnect device receives a menu message from the first packet forwarding device that indicates one or more types of data that are awaiting transmission on the first packet forwarding device. Based upon…
Method and apparatus for arbitrating data transmission in a CSMA/CD LAN
Granted: December 7, 1999
Patent Number:
5999538
A repeater that prevents a node involved in a collision from detecting that the collision occurred, and transmits the data packet received from that node to all other nodes connected to the repeater. The repeater accomplishes this by repeating the data packet received from that node during the collision, and discarding the data packets received from other nodes, thereby allowing a valid data packet to traverse the repeater and all communication medium segments attached thereto. The…
Repeater providing for deterministic access in a LAN utilizing the CSMA/CD medium access method
Granted: November 2, 1999
Patent Number:
5978385
An improved repeater or hub in a CSMA/CD based LAN that provides deterministic access to a shared communication medium for a limited number of nodes and improves the nondeterministic access latency for up to the maximum number of nodes allowed to be coupled to the repeater without requiring any modification to the adapter in each of the nodes. The repeater prevents a node involved in a collision from detecting that the collision occurred, and transmits the data packet received from that…
Protocol for communicating data between packet forwarding devices via an intermediate network interconnect device
Granted: October 26, 1999
Patent Number:
5974467
A message exchange protocol for interconnecting packet forwarding devices through an intermediate network interconnect device is provided. According to one aspect of the present invention, a method is provided for communicating data between packet forwarding devices. The presence of an interconnect device that is coupled between a first packet forwarding device and a second packet forwarding device is detected by recognizing a configuration sequence, for example. After the link between…
Method and apparatus for predicting and controlling data transmission in a CSMA/CD LAN
Granted: August 10, 1999
Patent Number:
5936962
A repeater in a LAN maintains a count of collisions and retransmission attempts for each node coupled to the repeater since that node's last successful packet transmission. The count is used to prioritize which of the nodes involved in a subsequent collision will be allowed to continue transmitting. The time at which data packets from the nodes arrive at the repeater will vary according to the propagation delay attributed to the varying lengths of the communication medium between each of…
