Abstract: A system for sensing and indicating orientation of electrical equipment has an orientation sensor and control logic. The control logic is configured to compare predefined data with a sensed orientation of the electrical equipment in order to determine whether the sensed orientation of the equipment is within an acceptable range such that sufficient cooling by a cooling system is likely to occur. If the sensed orientation of the equipment is not within the acceptable range, the control logic transmits a notification signal so that corrective action can occur. As an example, the notification signal may be used to notify a user of the improper orientation. In another example, the notification signal automatically triggers an action that compensates for the improper orientation.

Abstract: Embodiments of the present disclosure generally pertain to systems and methods for controlling multicast bandwidth. A communication system in accordance with an exemplary embodiment of the present disclosure comprises a network access device (NAD) having bandwidth (BW) expansion logic. The BW expansion logic is configured to automatically calculate the expansion ratio for a multicast stream based on various network parameters, such as layer 1 and 2 information, network packet size, and network transmission rate. Based on the expansion ratio, the BW expansion logic determines the actual transmission rate for transmitting the multicast stream across a subscriber link. The NAD then accepts or rejects join requests based on whether the sum of the current allocated link rate and the actual transmission rate exceed a rate threshold for the link.

Abstract: An optical communication system includes a plurality of Customer Premises Equipment (CPE) each having a reverse power supply and configured to transmit and receive data and provide power over a wire pair connected thereto. An optical network unit is formed as a plurality of communication ports. A respective communication port is configured to provide communications data service with a respective CPE by transmitting and receiving data therewith. A power management circuit is connected to the communication ports and configured to receive power provided by each reverse power supply at a respective CPE and manage power consumption in the ONU. A processor is configured to receive alarms generated by at least one of a CPE and ONU indicative of a power fault condition and process the alarms and discriminate between different power fault conditions.

Abstract: A correlation system, such as a correlation optical time domain reflectometer (OTDR) system, transmits a correlation sequence, such as an M-sequence, and measures the returns of the correlation sequence over time. The system correlates the transmitted sequence with the returns to provide correlation measurement values that respectively correspond to different distances from the point of transmission. A correlation error compensation element estimates a correlation error floor based on at least one correlation measurement value corresponding to a point along the fiber beyond a finite impulse response (FIR) length from the transmitter. The correlation error compensation element adjusts each correlation measurement value estimate in order to cancel the contribution of the correlation error floor from the measurements to provide compensated measurement values that are substantially free of the effects of the correlation error floor.

Abstract: An exemplary communication system has logic and memory for storing data indicative of data rates for transceivers coupled to a bonding group. The transceivers are coupled to a plurality of queues, and the logic is configured to determine a plurality of values based on the data. Each of the values indicates a number of bits in a respective one of the queues and is based on the data rate indicated by the data for a respective one of the transceivers. The logic is configured to receive a data packet and to fragment the data packet into a plurality of fragments. The logic is further configured to allocate the fragments to communication connections of the bonding group based on the values and to transmit the fragments to the transceivers such that each of the fragments is transmitted across the respective communication connection to which the fragment is allocated.

Abstract: 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.

Abstract: A system for sensing and indicating orientation of electrical equipment comprises an orientation sensor and control logic. The control logic is configured to compare predefined data with an orientation of the electrical equipment sensed by the orientation sensor in order to determine whether the sensed orientation of the equipment is within an acceptable range such that sufficient cooling by a cooling system is likely to occur. If the sensed orientation of the equipment is not within the acceptable range, the control logic transmits a notification signal so that corrective action can occur. As an example, the notification signal may be used to notify a user of the improper orientation. In another example, the notification signal automatically triggers an action that compensates for the improper orientation.

Abstract: The present disclosure generally pertains to systems and methods for providing service admission control in telecommunication networks. In one exemplary embodiment, a system comprises a network access control (SAC) element that is coupled to at least one node of a network segment. The SAC element communicates with each network node within the network segment to discover its configuration and capacity. The SAC element also stores information indicative of performance requirements, such as terms of SLAs pertaining to traffic that passes through the network segment. When a new service is to be added, the SAC element receives information indicative of the new service and its requirements, such as the SLA terms for the new service. The SAC element then automatically determines whether the network segment has sufficient capacity to add the new service without violating the SLAs of any of the services using the network segment.

Abstract: Egress of data packets from a packet switch is controlled in a manner that involves adjusting the shaper accumulators only when a packet egress event or accumulator credit threshold event occurs. A timeline having a number of timeslots is maintained in a memory to mark the times at which events are predicted to occur. If an egress event occurs, in which one or more data packets have been sent from a queue, or if the current timeslot contains a marker, then a count stored in an accumulator is adjusted. If an egress event has occurred or a threshold event in which a count stored in an accumulator has crossed a threshold has occurred, then a marker is stored in a future timeslot.

Abstract: An anomaly detection system comprises an echo canceler and anomaly detection logic. The echo canceler has a plurality of taps respectively associated with a plurality of tap coefficients. The anomaly detection logic is configured to determine a difference between a new tap coefficient associated with one of the taps and a previous tap coefficient associated with the one tap. The anomaly detection logic is configured to perform a comparison between the difference and a threshold and to detect an anomaly along a telecommunication line based on the comparison.

Abstract: A method and apparatus for network access control includes an apparatus for granting a computing device access to a network, the apparatus having a plurality of substantially similar access devices, wherein each access device comprises a status-determination module to determine an access status based at least in part on whether the computing device is compliant with an access policy, an access-grant module configured for receiving an access status corresponding to the computing device from one or more of the access devices, and granting the computing device access to the network according to at least one of the access status determined by the status-determination module or the received access status.

Abstract: An echo canceller system includes a first echo canceller having a first voltage divider and an adaptable second voltage divider that is configured to generate a first replica of an echo. A second echo canceller is configured to generate a second replica of an echo and has tap values that are generated in response to an error signal. A controller is coupled to the first and second echo cancellers and includes a selection algorithm that responds to the tap values of the second echo canceller and selects a voltage divider value for the adaptable second voltage divider.

Abstract: 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.

Abstract: N optical transceivers are each connected to a respective electronic module in one-to-one relation such that a respective one electronic module controls a respective one optical transceiver. An electronic switch matrix provides cross-connect capability between the P redundant electronic modules and N electronic modules to the N optical transceivers. A system controller determines when an active N electronic module has failed, and configures the electronic switch matrix to switch a P redundant electronic module into the optical transceiver to which the failed electronic module was connected. A system switch module redirects traffic and routing information, under the direction of the system controller, from the failed module to the newly activated redundant module so that the redundant module assumes the functionality of the failed module.

Abstract: A system for embedding metadata in data packets has logic that is configured to insert metadata into a data packet after the payload data and padding, if any. The logic further adjusts the packet's overhead, such as a frame check sequence, to account for the added length of the packet. The packet remains compliant with applicable protocols, such as Ethernet, and can be successfully communicated in accordance with such protocols while carrying the metadata. In this regard, the insertion of the metadata is transparent to protocol stacks such that the metadata data does not cause an error or the protocol stacks to render the packet invalid. In particular, the protocol stacks view the inserted metadata as part of the packet's pad field, and the inserted metadata should not cause any errors in the operation of the protocol stacks or prevent the protocol stacks from processing the packet.

Abstract: An optical communication system has a transmitter that generates an optical signal containing payload data and security data. The transmitter double modulates an optical signal where payload data is in-band and security data is out-of-band. If a man-in-the-middle attack occurs and the intrusion device is unable to detect the out-of-band signal, the intrusion device will not replicate the out-of-band signal thereby allowing the presence of the intrusion device to be detected.

Abstract: A telecommunications access module comprises at least one bonding engine that receives packet data and bonds subscriber line pairs together to form a bonding group over which packet fragments are transmitted. A database maintains a list of communications subscriber line pairs that form the bonding group. A processor is configured to determine whether an incoming packet subject to fragmentation is long enough to fragment across multiple subscriber line pairs. If the incoming packet can be fragmented, the processor is configured to calculate a cost function for minimum packet fragment sizes that is proportional to the end-of-fragment arrival time at the far end of each subscriber line pair and calculate remainders of packet fragment length. The packet is fragmented based on the calculated cost function and remainders of any packet fragment lengths and allocated to the subscriber line pairs and transmitted.

Abstract: An optical communications system includes a MSAP and an optical transceiver mounted at the MSAP that communicates over an optical network to at least one optical network terminal (ONT). A first electronic module is operatively connected to the optical transceiver and configured to control the optical transceiver and mounted at the MSAP separate from the optical transceiver. A redundant second electronic module is supported within the MSAP and mounted separate from the optical transceiver. A Mux/Demux module interconnects and supports the first and second electronic modules to form an integral unit and mounted at the MSAP separate from the optical transceiver. The Mux/Demux module is configured to switch the second electronic module into communication with the optical transceiver upon failure of the first electronic module.

Abstract: A communication system comprises a plurality of subscriber lines that are bonded to provide a bonding group, referred to as the “primary bonding group.” A data stream comprising a plurality of data packets is transmitted to a port, referred to as the “primary port,” of a network termination unit (NTU) coupled to each subscriber line of the primary bonding group, and a bonding engine of the NTU fragments the data packets for transmission across the bonding group. Logic, referred to as “link state awareness (LSA) logic,” is configured to monitor at least one communication parameter indicative of the communication performance of the bonding group. If the measured communication performance is within a specified range, the LSA logic disables the primary port. Such action signals a switching element to switch communication to another NTU that is coupled to one or more other subscriber lines for backing up the primary bonding group.

Abstract: A communications system includes a communications device having a plurality of access modules each having a port and connected to a communications line and a plurality of transmitters with the respective transmitter associated in one-to-one correspondence with the communications line of an access module. Each transmitter has a line driver and is configured to couple communications signals to a respective communications line. A voltage source is connected to the line drivers and configured to provide a bias voltage to the line drivers that varies depending on a selected minimum power level. A controller is connected to the voltage source and has logic configured to change the bias voltage to the line drivers. The controller is responsive to a minimum data rate for each bias voltage.