Abstract: A method may include receiving a packet including a destination address, identifying a destination address entry based on the destination address, the destination address entry including an address identifier, comparing the address identifier to an event identifier, determining whether an event occurred based on the comparison, and forwarding the packet on an alternate path if it is determined that the event occurred.

Abstract: Enhanced Cable Modem Termination System (CMTS) functionality, including programmable digital domain modulators and demodulators for dynamic channel assignment, is incorporated into Fiber Nodes (FNs) or mini Fiber Nodes (mFNs), yielding enhanced Fiber Nodes (eFNs). These eFns distribute CMTS functionality deep into Hybrid-Fiber-Coax Networks (HFCN) rather than centralizing the CMTS functions within a single location. Moving the cable modem terminations closer to the subscribers shortens the analog RF paths required to support cable modems. Communication of both subscriber data and CMTS control data is performed over Ethernet-compatible packet networks between the field-based CMTSs and an upstream facility (e.g., the Head End), which includes an Internet gateway. Packet data for multiple subscriber cable modems is easily compressed and merged over common network paths, reducing cabling plant complexity and increasing bandwidth utilization.

Abstract: The invention is directed to techniques for initiating lawful intercept of packets associated with subscriber sessions on a network device of a service provider network based on identification triggers. A law enforcement agency may send an intercept request for a subscriber to an administration device of the service provider network. The administration device may then configure one or more identification triggers for the subscriber based on the intercept request. The techniques described herein initiate lawful intercept when one or more subscriber sessions on a network device match the one or more identification triggers. The techniques described herein include configuring trigger rules that include identification triggers for subscribers on a network device via a command line interface (CLI) of the network device. In addition, the techniques described herein include configuring identification triggers in a subscriber profile on an authentication device connected to a network device.

Abstract: A call admission control technique allowing flexible and reliable call admissions at an ATM switch in the case of an ATM network including both QoS-specified and QoS-unspecified virtual connections is disclosed. In the case where a QoS (Quality of Service) specified connection request occurs, an estimated bandwidth is calculated which is to be assigned to an existing QoS-unspecified traffic on the link associated with the QoS-specified connection request. A call control processor of the ATM switch determines whether the QoS-specified connection request is accepted, depending on whether a requested bandwidth is smaller than an available bandwidth that is obtained by subtracting an assigned bandwidth and the estimated bandwidth from a full bandwidth of the link.

Abstract: A communication node contains intelligence for directing both internet protocol (IP) packets and Asychronous Transfer Mode (ATM) cells toward their destinations. The ATM cells and IP packets may be received within a common data stream. The respective devices process the ATM cells and IP packets to direct the cells and packets to the proper output ports towards their destinations. The device is capable of performing policing and quality of service (QOS) processing on both the ATM cells and the IP packets.

Abstract: A communication network design circuit can derive a path and a necessary link capacity for multiple point communication service permitting arbitrary communication within a predetermined range of communication amount by providing traffic amount of data in-flowing through an ingress node and traffic amount of data flowing out through an egress node. The communication network designing circuit has setting means for setting a mathematical programming problem for deriving the multiple point communication service and optimizing means for solving the mathematical programming problem set by the setting means and obtaining the path for the multiple point communication service.

Abstract: A layer 1 network frame is disclosed that includes data of a layer 2 frame. A header of the layer 1 frame header includes: a packet length field to indicate a size of a payload portion of the layer 1 frame, a priority field to indicate a priority of the layer 1 frame, a protocol field to identify a protocol of the data in the layer 2 frame, a frame mode field to indicate a correspondence between the layer 1 frame and the layer 2 frame included within the payload, a stuff field to indicate whether stuff data is contained in the layer 1 frame, and a cyclic redundancy check (CRC) field to indicate a CRC result.

Abstract: A circuit simulation apparatus is disclosed by which, even if an STS-N frame of an abnormal length is detected by a reassembly buffer, the frame length can be compensated for while preventing an overflow of the reassembly buffer. When an STS-(N×M) frame formed by multiplexing M STS-N frames formed from different channels is cellularized into ATM cells or M different STS-N frames assembled from ATM cells are multiplexed into an STS-(N×M) frame, an ATM cell sync signal and ATM cell data from a buffer section are outputted as a frame pulse signal and frame data from a reassembly section to a circuit termination section, and frame length compensation of the frame pulse signal and the frame data is performed by the reassembly section.

Abstract: A network system includes a first device and a second device separated by a network having asymmetric routes in which traffic forwarded in a first direction from the first device to the second device may travel a different route than traffic forwarded in a second direction from the second device to the first device. At least three intermediate processing devices are located between the first device and the second device, wherein at least two of the intermediate processing devices are located along different asymmetric routes. The intermediate processing devices intercept a communication flow between the first device and the second device, and encapsulate the communication flow within network tunnels so that communications associated with the communication flow in the first direction and the second direction are forwarded between a same set of at least two of the intermediate processing devices.

Abstract: The principles of the invention allow a network device, such as a router, to maintain a high level of services during a failure without substantially utilizing redundant hardware components. During execution, the network device stores a subset of state information associated with applications executing on the network device. In the event of a failure, the network device reconstructs data structures associated with at least one of the applications based on the stored subset of state information. Next, the network device restarts at least one of the applications to resolve the failure. While restarting, the network device may continue to receive and forward information, such as packets, and, therefore, may continue to provide a high level of access to client devices previously connected to the network device.

Abstract: In general, this disclosure describes techniques of selecting routes for network packets through a computer network based, at least in part, on electrical power procurement arrangements of devices in the computer network. As described herein, there may be a plurality of routes through a computer network from a first device to a second device. Each of these routes may include one or more devices that consume electrical power. A route selection device may make a determination regarding how network packets are to be routed among these routes based, at least in part, on arrangements made to procure the electrical power consumed by the devices along the routes. After the route selection device makes this determination, the route selection device may cause network packets to be routed among these routes in accordance with this determination.

Abstract: A method of scheduling upstream bandwidth. This method comprises: 1) anticipating the need for the upstream bandwidth in advance of any specific request for said upstream bandwidth; and 2) scheduling the upstream bandwidth in accordance with such need.

Abstract: A front-to-back cooling system allows cooling of an apparatus containing two orthogonal sets of modules. A vertical set of modules is cooled with vertical air flow across the modules that enters from a front of the apparatus and exits from the back of the apparatus. A horizontal set of modules is cooled with air flow that passes through openings in a midplane connecting the two sets of modules.

Abstract: A device and method are disclosed for correctly restoring a read clock when there are a plurality of STM data stream transmission sources. In a CES device of an ATM communication system, ATM cells from respective connections, which are to be delivered to the same outgoing line, are accumulated in a reassembly buffer memory and a PLO control unit aggregates the amount of ATM cells accumulated in the reassembly buffer memory for each connection. Subsequently, the PLO control unit calculates the frequency of a read clock based on the amount of accumulated ATM cells for each connection. A PLO restores the read clock which is applied to read data from the reassembly buffer memory for delivery to an STM network.

Abstract: A network device includes a group of interfaces. Each interface is associated with at least one other interface of the group of interfaces and a group of network addresses. Each interface is configured to monitor at least one of the group of network addresses with which the each interface is associated or the at least one other interface with which the each interface is associated, and determine whether to logically shut down based on the monitoring.

Abstract: Methods, computer program products and apparatus for processing data packets are described. Methods include receiving the data packet, examining the data packet, determining a single flow record associated with the packet and extracting flow instructions for two or more devices from the single flow record.

Abstract: A forwarding component of a routing node floods copies of a packet to a plurality of next hops associated with the same layer two (L2) network as an interface on which the packet was received. The plurality of next hops excludes a next hop that corresponds to the interface that received the packet. The forwarding component requires that forwarding information installed by a control unit specify the plurality of next hops to which to flood the copies of the packet, and the forwarding component is not capable of deriving the plurality of next hops to which to flood the copies of the packet from a single flooding next hop identifier after the packet is received. Prior to receiving the packet, a flooding next hop control module derives the plurality of next hops based on the flooding next hop and installs the derived next hops into the forwarding information.

Abstract: Techniques for controlling access to resources within a device are described. A device is described, for example, that includes a computer-readable medium and a management interface. The computer-readable medium stores configuration data and authorization data. The authorization data defines an access control attribute and an associated regular expression specifying a textual pattern. The management interface receives a text-based command to access the configuration data of the device, evaluates the command using the regular expression, and controls access to the configuration data based on the evaluation.

Abstract: A front-to-back cooling system allows cooling of an apparatus containing two orthogonal sets of modules. Each set of modules is independently cooled. A vertical set of modules is cooled with vertical air flow across the modules that enters from a front of the apparatus and exhausts from a back of the apparatus. A horizontal set of modules is cooled with horizontal front-to-back air flow. When the horizontal set of modules is at the front of the apparatus, a plenum extending exterior to the vertical set of modules allows exhausting horizontally flowing air to the rear of the apparatus. When the horizontal set of modules is at the rear of the apparatus, a plenum extending exterior to the vertical set of modules allows moving air from the front of the apparatus to a chamber holding the horizontal modules.

Abstract: A substitution call control system includes an ATM (Asynchronous Transfer Mode) subscriber network of an ATM communication network. The ATM subscriber network includes a plurality of network terminators respectively connected with a plurality of subscriber terminals, and an ATM subscriber line concentrator, which accommodates VCs (Virtual Connection) to the plurality of network terminators, and is connected with a ATM switching apparatus of the ATM network through a UNI (User-Network Interface). The ATM subscriber line concentrator includes a substitution call control function to substitute for the plurality of network terminators and the subscriber terminals for a call control.