INGRESS NOISE REDUCTION IN A DIGITAL RECEIVER
Granted: January 20, 2011
Application Number:
20110013734
The invention provides a device (D2) for reducing ingress noise in a digital signal, comprising a noise predictor (20) for predicting an amount of ingress noise in the digital signal (sn) based on past samples of the ingress noise, and a subtractor (21) for subtracting the predicted amount of ingress noise from the digital signal. Channel distortion is compensated for by a noise-independent equalizer (25), such as a ZF equalizer, placed upstream of the noise predictor (20). The device…
TRACKING FRAGMENTED DATA FLOWS
Granted: January 20, 2011
Application Number:
20110013636
A device may receive a fragment of a fragmented data unit, determine a flow identifier that identifies a data flow with which the fragment is associated, and create a flow entry, based on the flow identifier, to store information associated with the data flow. The device may also determine a fragment key associated with the fragment, store a pointer to the flow entry based on the fragment key, correlate the fragment and another fragment, associated with the data flow, based on the…
NON-STOP FORWARDING IN A MULTI-CHASSIS ROUTER
Granted: January 20, 2011
Application Number:
20110013508
State information is synchronized between a plurality of routing engines in a multi-chassis router according to a synchronization gradient. An example multi-chassis router is described that includes a primary routing engine and a standby routing engine in each chassis. According to the synchronization gradient, the primary routing engine of a control node updates state information on the standby routing engine of the control node prior to updating the primary routing engines of the other…
ENABLING INCOMING VOIP CALLS BEHIND A NETWORK FIREWALL
Granted: January 13, 2011
Application Number:
20110010752
A network device is configured to receive a registration message from a private user device including a private internet protocol (IP) address associated with the private user device. A public IP address and discrete port number are assigned to the private user device and private IP address and stored in an incoming call table. The registration message is translated to include the public IP address and discrete port number. The registration message is forwarded to a proxy server for…
LOW LATENCY REQUEST DISPATCHER
Granted: January 13, 2011
Application Number:
20110010474
A first-in-first-out (FIFO) queue optimized to reduce latency in dequeuing data items from the FIFO. In one implementation, a FIFO queue additionally includes buffers connected to the output of the FIFO queue and bypass logic. The buffers act as the final stages of the FIFO queue. The bypass logic causes input data items to bypass the FIFO and to go straight to the buffers when the buffers are able to receive data items and the FIFO queue is empty. In a second implementation, arbitration…
FILTER-BASED FORWARDING IN A NETWORK
Granted: January 13, 2011
Application Number:
20110007743
A router receives a packet at an ingress interface. The router classifies the received packet based on at least a first field value contained in the header of the packet. According to the classification of the received packet, the router associates one of the plurality of forwarding tables to the packet. The router then performs a lookup operation in the associated forwarding table according to at least a second field value contained in the header of the packet. Based on the lookup…
ARBITER CIRCUIT AND METHOD OF CARRYING OUT ARBITRATION
Granted: January 13, 2011
Application Number:
20110007734
A method of carrying out arbitration in a packet exchanger including an input buffer temporarily storing a packet having arrived at an input port, and a packet switch which switches a packet between a specific input port and a specific output port, includes the steps of (a) concurrently carrying out a first plurality of sequences in each of the sequences basic processes for at least one of the input buffer and the output port are carried out in a predetermined order, and (b) making an…
MULTIPLEXING APPARATUS AND CELL DISCARD METHOD
Granted: January 13, 2011
Application Number:
20110007634
An ATM multiplexing apparatus of the present invention is the apparatus for selectively performing cell discard processing in the case of congestion on the basis of a use state of the same connection formed by cells from the side of an ATM switching unit and subscribers without installing UPC units, and the ATM multiplexing apparatus, which is connected to the ATM switching unit and each of plural subscribers through ATM communication lines and performs multiplexing processing to ATM…
REDUNDANT PSEUDOWIRES FOR BORDER GATEWAY PATROL-BASED VIRTUAL PRIVATE LOCAL AREA NETWORK SERVICE MULTI-HOMING ENVIRONMENTS
Granted: December 30, 2010
Application Number:
20100329109
A method performed by a provider edge device includes generating pseudo-wire tables based on virtual private local area network service advertisements from other provider edge devices, where the provider edge device services customer edge devices, and establishing pseudo-wires with respect to the other provider edge devices, based on the pseudo-wire tables, where the pseudo-wires include an active pseudo-wire and at least one standby pseudo-wire with respect to each of the other provider…
SINGLE FAN TRAY IN A MIDPLANE ARCHITECTURE
Granted: December 30, 2010
Application Number:
20100328886
A chassis may include a front section that contains a first electronic circuit board oriented in a first plane, a rear section that contains a second electronic circuit board oriented in a second plane, where the first plane and the second plane are substantially orthogonal, a midplane dividing the front and the rear sections, and a fan tray assembly including a plurality of fans to cool both the first electronic circuit board of the front section and the second electronic circuit board…
SYSTEMS AND METHODS FOR PROVIDING REDUNDANCY IN COMMUNICATIONS NETWORKS
Granted: December 23, 2010
Application Number:
20100325486
A system includes a first network device and a second network device. The first network device includes a group of first logical portions and is configured to detect a problem with one of the first logical portions, and transmit a message identifying the one first logical portion. The second network device includes a group of second logical portions, where the group of second logical portions corresponds to the group of first logical portions. The second network device is configured to…
DISCOVERING PATH MAXIMUM TRANSMISSION UNIT SIZE
Granted: December 23, 2010
Application Number:
20100322249
Intermediate network devices, such as routers, are configured to discover a maximum transmission unit (MTU) for a path between two network endpoints by removing data from packets when the packet size exceeds a link MTU to a next hop. An example intermediate network device includes a forwarding engine to determine an interface card through which to forward a received packet and to determine a link MTU for a link corresponding to the interface card, wherein the received packet comprises a…
SCHEDULER FOR TRANSMIT SYSTEM INTERFACES
Granted: December 23, 2010
Application Number:
20100322243
A system balances bandwidth used by a data stream. The system receives data in the data stream and partitions the data into bursts. The system then identifies whether a size of a current one of the bursts is less than a size of a maximum burst associated with the data stream and schedules an additional burst in the data stream when the current burst size is less than the maximum burst size. The system transmits the current burst and the additional burst to balance bandwidth used by the…
BUNDLING ATM AND POS DATA IN A SINGLE OPTICAL FIBER
Granted: December 23, 2010
Application Number:
20100322242
A forwarding node decapsulates and encapsulates data. The decapsulation may be performed using pattern matching techniques and the encapsulation may be performed using pattern insertion techniques. The decapsulation and encapsulation are preferably performed by hardware devices such as application specific integrated circuits (ASICs) to enhance the speed of such operations. The decapsulation and encapsulation may be independent of each other and performed on a per virtual circuit basis.
SYSTEMS AND METHODS FOR SELECTIVELY PERFORMING EXPLICIT CONGESTION NOTIFICATION
Granted: December 23, 2010
Application Number:
20100322075
A system provides congestion control and includes multiple queues that temporarily store data and a drop engine. The system associates a value with each of the queues, where each of the values relates to an amount of memory associated with the queue. The drop engine compares the value associated with a particular one of the queues to one or more programmable thresholds and selectively performs explicit congestion notification or packet dropping on data in the particular queue based on a…
IN-LINE PACKET PROCESSING
Granted: December 9, 2010
Application Number:
20100309916
A method and apparatus for in-line processing a data packet while routing the packet through a router in a system transmitting data packets between a source and a destination over a network including the router. The method includes receiving the data packet and pre-processing layer header data for the data packet as the data packet is received and prior to transferring any portion of the data packet to packet memory. The data packet is thereafter stored in the packet memory. A routing…
FORWARDING FRAMES IN A COMPUTER NETWORK USING SHORTEST PATH BRIDGING
Granted: December 9, 2010
Application Number:
20100309912
Methods, apparatus, and products are disclosed for forwarding frames in a computer network using shortest path bridging (‘SPB’). The network includes multiple bridges, and each edge bridge is assigned a unique service virtual local area network (‘VLAN’) identifier. One of the bridges receives a frame for transmission to a destination node. The received frame includes a service VLAN identifier for the ingress bridge through which the frame entered the network and a customer VLAN…
MANAGING A NETWORK FLOW USING APPLICATION CLASSIFICATION INFORMATION AND ACTIVE SIGNALING RELAY
Granted: December 9, 2010
Application Number:
20100309786
Techniques for classifying and managing network flows associated with a network service using application classification information and active signaling relay are described. A network device, for example, includes a signaling interceptor and a network flow interface. The signaling interceptor monitors a communication between a customer device and an application server, and identifies a network flow associated with a network service provided to the customer device by the application…
MULTIPLE MEDIA ACCESS CONTROL (MAC) ADDRESSES
Granted: December 2, 2010
Application Number:
20100306571
A method for providing multiple media access control (MAC) addresses in a device of a master/slave system may include providing a first MAC address in a MAC address storage of the device. The method may also include providing a second MAC address in a multicast table entry of a multicast hash filter of the device.
PIPELINE SCHEDULER WITH FAIRNESS AND MINIMUM BANDWIDTH GUARANTEE
Granted: November 25, 2010
Application Number:
20100296513
A pipeline scheduler provides a minimum bandwidth guarantee by transporting cells from an input port to an output port in a two-phased approach. Cells that conform to a minimum cell rate (MCR) are selected from queues at the input port and arranged into supercells for transport to the output port, followed by nonconforming cells, to guarantee fairness by using scheduling modules to build the supercells first for conforming cells, and then for nonconforming cells. Reservation vectors are…
