Assignee: Force10 Networks, Inc.

Location: San Jose, CA
No. of patents: 24

Number	Title	Issue Date
8184450	EMI shielded bus bar configuration A modular packet network device uses bus bars to transfer primary power to either a backplane or directly to one or more cards that perform primary-to-logic-power conversion. The bus bars are fabricated in packages that reduce the transfer of differential and common...	05/22/2012
8168891	Differential trace profile for printed circuit boards Circuit boards and methods for their manufacture are disclosed. The circuit boards carry high-speed signals using conductors formed to include lengthwise channels. The channels increase the surface area of the conductors, and therefore enhance the ability of the con...	05/01/2012
8158892	High-speed router with backplane using muli-diameter drilled thru-holes and vias A high-speed router backplane is disclosed. The router backplane uses differential signal pairs on multiple signal layers, each sandwiched between a pair of digital ground layers. Thru-holes are used to connect the differential signal pairs to external components. T...	04/17/2012
8149690	Elimination of bad link state advertisement requests A link-state protocol running on a router requires that an adjacent neighbor router in the same network maintain a synchronized link state database in order to form the adjacency. Should the neighbor request link state information that the router does not possess, n...	04/03/2012
8121205	Extended non-return-to-zero serial channel signaling Methods and apparatus for serial channel operation are disclosed. An N+1-level signaling scheme is used to transmit N staggered but overlapping NRZ sub-sequences concurrently on a serial channel. Each sequence has a bit rate R and an essential bandwidth of R Hz. The...	02/21/2012
8119921	Impedance tuning for circuit board signal path surface pad structures The characteristic impedance of a surface pad is manipulated by reticulating the pad and filling the spaces with a dielectric material, providing an inductive element in the coupling of the surface pad to an underlying ground pad of a ground plane, or a combination ...	02/21/2012
8102848	Multicast high availability enhancements for faster convergence During initial formation of an adjacency, two neighboring PIM speakers exchange, in their hello messages, information as to whether each supports a non-stop forwarding (NSF) capability. When one of the PIM speakers restarts, the PIM neighbor senses this event, and r...	01/24/2012
7630301	Method and apparatus for line and path selection within SONET/SDH based networks A line level selection unit is described that selects signals from a backplane. The line level selection unit has a clock that times egress time slots associated with an egress network line coupled to the egress channel. The egress channel has a primary protection g...	12/08/2009
7615709	Circuit board through-hole impedance tuning using clearance size variations A circuit board comprises signaling through-holes that pass through a plurality of layers, including signal trace and digital ground plane layers, and power reference plane layers. Clearances are set to achieve a desired impedance characteristic for the through-hole...	11/10/2009
7558872	Point-to-point protocol flow control extension Method and apparatus are disclosed for flow control over Point-to-Point Protocol (PPP) data links. A method of negotiating such flow control between two PPP peers is disclosed, along with methods for operating flow control across a PPP link. In one embodiment, flow ...	07/07/2009
7513923	Variable impedance air filter for electronic systems In one embodiment, a removable air filter is mounted proximate to where electrical equipment is mounted in a case. The filter has at least two sections with different finite air impedances. The filter is constructed of a filter media mounted inside of a frame. When ...	04/07/2009
7468979	Layer-1 packet filtering An apparatus to perform hardware-based lossless stateful signature matching is disclosed. In one embodiment, the apparatus comprises a memory and multiple finite state machine (FSM) comparison units operating in parallel to compare packets to signatures to identify ...	12/23/2008
7448132	Method of fabricating a high-layer-count backplane The disclosed board fabrication techniques and design features enable the construction of a reliable, high-layer-count, and economical backplane for routers and the like that require a large number of signaling paths across the backplane at speeds of 2.5 Gbps or gre...	11/11/2008
7405947	Backplane with power plane having a digital ground structure in signal regions For electrical backplanes and the like, a power plane adaptation to improve the propagation of high-speed signals through clearances in an embedded power plane is disclosed. In exemplary embodiments, the power plane is segmented in a high-speed connector region, suc...	07/29/2008
7346067	High efficiency data buffering in a computer network device A network processing device stores and aligns data received from an input port prior to forwarding the data to an output port. Data packets arrive at various input ports already having an output queue or virtual output queue assigned. A buffer manager groups one or ...	03/18/2008
7336502	High-speed router with backplane using tuned-impedance thru-holes and vias A high-speed router backplane is disclosed. The router backplane uses differential signal pairs on multiple signal layers, each sandwiched between a pair of digital ground layers. To reduce routing complexity, at least some of the differential signal pairs route thr...	02/26/2008
7284074	Pipelined network processing with FIFO queues A system and method for operating on data within a network device is described. Between two data operations in a network device is a FIFO queue, which is used to separate the clock domains of the data operations. Data from the first operation is stored in the FIFO q...	10/16/2007
7277425	High-speed router switching architecture A high-speed router and method for operation of the core of such a router are disclosed. The disclosure describes switching packet data through a router core serving core ingress and egress ports. The router maintains at least one always-up ingress serial link from ...	10/02/2007
7274696	Scalable redundant switch fabric architecture A high-speed router and method for operation of the core of such a router are disclosed. The disclosure describes routing packets from core input ports to core output ports by aggregating or queuing packets at router core ingress ports in queues designated for commo...	09/25/2007
7239527	Backplane with power plane having a digital ground structure in signal regions For electrical backplanes and the like, a power plane adaptation to improve the propagation of high-speed signals through clearances in an embedded power plane is disclosed. In exemplary embodiments, the power plane is segmented in a high-speed connector region, suc...	07/03/2007
7224671	Method and apparatus for load balancing in network processing device A data rate controller controls a rate that data is transferred over a backplane in a network processing device. A bandwidth allocator allocates bandwidth to an input port for transmitting data over the backplane to an output port. A bandwidth limiter identifies a m...	05/29/2007
7190696	System and method for distributing packets among a plurality of paths to a destination A network-processor device comprises a packet-processor for an ingress port that is operative to distribute data flows to a plurality of equal-cost paths for transfer of data toward a given destination. The packet-processor also includes further distribution circuit...	03/13/2007
7154902	Epoch-based packet switching A high-speed router and method for operation of the core of such a router are disclosed. A switch fabric serves a plurality of ingress and egress ports. Packets are sorted into queues at each ingress port, each queue corresponding to one of the egress ports. Queue s...	12/26/2006
7124502	Method of fabricating a high-layer-count backplane The disclosed board fabrication techniques and design features enable the construction of a reliable, high-layer-count, and economical backplane for routers and the like that require a large number of signaling paths across the backplane at speeds of 2.5 Gbps or gre...	10/24/2006

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Assignee: Force10 Networks, Inc.