Abstract: A correlation optical time domain reflectometer (OTDR) system embeds an OTDR signal in a digital data signal that is to be converted into an optical signal and transmitted across an optical fiber to a remote receiver. In particular, the digital data signal is amplitude modulated with the OTDR signal, which is based on a pseudo noise (PN) sequence, such as an M-sequence. The amplitude modulation is relatively small, for example, less than about 10% of the digital data signal's peak amplitude in an effort to limit the OTDR signal's effect on communication performance. A sequence recovery element receives reflections from the optical fiber and converts the reflections to digital samples. Each digital sample from the sequence recovery element is correlated by correlators that respectively correspond to delays and, hence, locations along the optical fiber, and accumulators accumulate the correlation values from the correlators.
Type:
Grant
Filed:
May 20, 2010
Date of Patent:
December 10, 2013
Assignee:
ADTRAN, Inc.
Inventors:
Michael D. Turner, Leif J. Sandstrom, John Gordon Brooks, Kevin W. Schneider, Daniel M. Joffe
Abstract: A communication system utilizes at least one digital subscriber line access multiplexer (DSLAM) at an intermediate point between a network facility and one or more customer premises. Initially, as few as one DSLAM, may be implemented at the intermediate point, but the system can be expanded to include any number of DSLAMs at the intermediate point. Any of the DSLAMs at the intermediate point can be selectively upgraded at any time to a vectoring solution as may be desired. The use of such DSLAMs provides the network service provider with flexibility in implementing and maintaining the network.
Abstract: In accordance with a non-limiting example, an optical communications system includes a plurality of Customer Premises Equipment (CPE), each having a reverse power supply circuit and each connected to a wire pair and configured to transmit and receive data and provide reverse power over the wire pair. An Optical Network Unit (ONU) includes a plurality of communication boards. A respective communication port is connected to a selected wire pair and its associated CPE through which data is transmitted and received and power received therefrom. A power management circuit is connected to each of the communication ports and configured to receive power and provide power sharing and manage power consumption and power supply redundancy from the plurality of CPE through the communication ports.
Type:
Grant
Filed:
February 21, 2011
Date of Patent:
December 3, 2013
Assignee:
Adtran, Inc.
Inventors:
Brian C. Smith, Steven M. Robinson, Daniel M. Joffe
Abstract: The present disclosure generally pertains to systems and methods for cancelling crosstalk in satellite access devices, such as DSLAMs. In one exemplary embodiment, a satellite DSLAM is configured to employ a vectored DSL modulation format, such as vectored VDSL, on both a customer premises (CP) side of the DSLAM and a network side of the DSLAM. For at least one tone communicated by the DSLAM, the DSLAM is configured to maintain a set of coefficients indicative of crosstalk contributions from interferers on both sides of the DSLAM. Based on such coefficients, the DSLAM is configured to cancel crosstalk that couples from one side of the DSLAM to the other.
Type:
Grant
Filed:
January 28, 2011
Date of Patent:
November 12, 2013
Assignee:
ADTRAN, Inc.
Inventors:
Michael D. Turner, Arlynn Wayne Wilson, Fred Chu
Abstract: In accordance with a non-limiting example, an Optical Network Unit (ONU) includes an optical transmitter that has a laser diode and laser driver connected to the laser diode and configured to drive the laser diode so that the laser diode emits an optical communications signal based on transmit data signals. A feedback circuit includes a monitoring photodiode that receives optical feedback signals from the laser diode. A watchdog circuit is connected to the monitoring photodiode and laser driver and includes a logic circuit configured to process the feedback signals and transmit signals to determine if the ONU is rogue. This logic circuit in one example is an XOR logic circuit.
Type:
Grant
Filed:
November 30, 2010
Date of Patent:
November 12, 2013
Assignee:
Adtran, Inc.
Inventors:
Leif J. Sandstrom, Philip D. Williams, Richard L. Goodson
Abstract: A portable technical support device includes a location-determining element configured to allow the portable technical support device to be location-aware, and a communicating element configured to allow the portable technical support device to access a network management system, the network management system having information relating to a communication device, wherein the portable technical support device obtains from the management system the information relating to the communication device by making the network management system aware of the location of the communication device using the portable technical support device as a location-determining element.
Abstract: A smart breaker includes a current detector configured to detect current flow from a power source to a protected device. A controller has logic and is configured to select a trip value in response to the detected current flow and stored configuration information relating to the protected device. The protected device includes at least one installed component requiring power and the stored configuration information can be at least one of data regarding the number of installed components in the protected device requiring power, the amount of power used by each of the installed components, and the expected power requirements of the installed components.
Type:
Grant
Filed:
July 22, 2010
Date of Patent:
October 22, 2013
Assignee:
Adtran, Inc.
Inventors:
Brian Christian Smith, Randall Johnston
Abstract: A system and method provide transparent LAN services in a metro-WAN environment to extend enterprise LANs over metro and wide area networks. The transparent LAN services generally provide customers with a layer two Ethernet connectivity with MAC learning capabilities.
Type:
Grant
Filed:
November 20, 2008
Date of Patent:
October 22, 2013
Assignee:
Adtran, Inc.
Inventors:
Vinay Bannai, Theodora Karali, Peter Geoffrey Jones, Jacqueline M. Zoucha, Arun Sastry
Abstract: A telecommunications system includes a telecommunications device having ānā line card slots for receiving ānā line cards powered from a power supply. The device includes at least one installed line card. A smart breaker is connected to the telecommunications device and includes a current detector configured to detect current flow from the power supply through the smart breaker to any installed line cards. A controller has logic and is configured to select a trip value in response to the detected current flow and stored configuration information relating to any installed line cards within the telecommunications device.
Type:
Grant
Filed:
July 22, 2010
Date of Patent:
October 22, 2013
Assignee:
Adtran, Inc.
Inventors:
Brian Christian Smith, Randall Johnston
Abstract: An enclosure for outside plant equipment includes a base unit and first Printed Circuit Board (PCB) carried by the base unit and having a circuit side and opposing component side on which electronic components are mounted. A heat sink is connected to the first PCB at the circuit side and configured to dissipate heat from any electronic components mounted on the first PCB at the component side. A cover is attached to the base unit and has an inside surface covering the enclosure. A second PCB has a circuit side and opposing component side on which electronic components are mounted. The second PCB is supported by the inside surface of the cover. A heat sink is connected to the second circuit board at the circuit side and configured to dissipate heat from any electronic components mounted on the second PCB. A PCB finger connector interconnects the first and second PCB's at the component side.
Abstract: A method for protecting a network against a security attack from an user, and in particular, for a layer 2 switch, against a MAC flooding attack. Here, the MAC flooding attack floods the layer 2 switch with at least one packet, a database is provided which saves a MAC address and its allocation and the database has a maximum quantity. According to the method, an interface between the user of the network and a network access functions as a line of demarcation. When the limit of the maximum quantity for a port is reached, the port is blocked during a blocking time. This not only protects the first access node, but also the following network nodes and users respectively, against a security attack.
Abstract: A lockable connector includes a receptacle having an opening located on an engagement surface and a spring clip slidably attached to the receptacle, the spring clip having a plug retention tang oriented substantially perpendicular to the opening on the engagement surface, the plug retention tang being positioned on the spring clip so that when the spring clip assumes a locking position the plug retention tang aligns with the opening located on the engagement surface of the receptacle.
Abstract: A method for diagnosing an optical communication network having a control system, an optical hub, and multiple optical network terminators. The hub communicates with all the network terminators via an inband management channel. In case one network terminator disturbs the communication from the network terminators to the hub and the communication from the hub to the network terminators is functional, the control system sends a shut-off command to one network terminator, checks if the disturbance is gone, if the disturbance is not gone, sends a pulse mode activation command to this network terminator, checks if there is a superposition signal of the disturbance signal with a pulse mode signal and marks the network terminator as bad, if the pulse signal is not superimposed.
Abstract: A communication system extending Ethernet Operation and Management (OAM) Loopback Message (LBM) and Loopback Replay (LBR) functionality into a time division multiplexing (TDM) domain has a first interworking function (IWF) of an Ethernet network that transmits an Ethernet Operation and Management (OAM) Loopback Message (LBM) having a first type length value (TLV) field. The first IWF controls the first TLV field to indicate that a connectivity test is to extend beyond the Ethernet network. The communication system further has a second IWF of the Ethernet network that receives the Ethernet OAM LBM and interprets the first TLV field. In addition, the second IWF performs a TDM connectivity test across a TDM connection in response to the Ethernet OAM LBM and based on the first TLV field and transmits a reply for the Ethernet OAM LBM to the first IWF, the reply prompted by the LBM and comprising data based on the TDM connectivity test.
Type:
Grant
Filed:
April 20, 2010
Date of Patent:
September 3, 2013
Assignee:
ADTRAN, Inc.
Inventors:
David Eric Jones, Marc Kimpe, Harold Lloyd Boling
Abstract: A computer system has a translation lookaside buffer (TLB) having a plurality of entries for mapping virtual memory addresses to physical memory addresses and logic configured to perform the following steps for an entry of the TLB: (a) selecting a TLB entry size for the entry; (b) determining whether a mapping for the entry is aligned with a boundary of a contiguous section of memory without overshooting an end of the contiguous section of memory, wherein the mapping is based on the TLB entry size and maps virtual memory addresses to physical memory addresses for a section of the memory consistent with the TLB entry size; (c) if the mapping is determined to be aligned with the boundary of the contiguous section of memory without overshooting the end of the contiguous section of memory, configuring the entry with the mapping written into the entry; and (d) repeating steps (a) through (c) until a mapping is found to be aligned with the boundary of the contiguous section of memory without overshooting the end of
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 adjusts each correlation measurement value 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.
Type:
Grant
Filed:
August 25, 2011
Date of Patent:
September 3, 2013
Assignee:
ADTRAN, Inc.
Inventors:
Michael D. Turner, Leif J. Sandstrom, John Gordon Brooks
Abstract: A lockable connector includes a receptacle having an opening located on an engagement surface and a spring clip slidably attached to the receptacle, the spring clip having a plug retention tang oriented substantially perpendicular to the opening on the engagement surface, the plug retention tang being positioned on the spring clip so that when the spring clip assumes a locking position the plug retention tang aligns with the opening located on the engagement surface of the receptacle.
Abstract: In a method for checking a subscriber line with a first and a second electrical line, wherein each line is connected to an encoder/decoder via a subscriber line circuit, the first line is connected to ground, a resistance of the second line is increased, an audio signal is outputted from the encoder/decoder to the first line; and a first frequency-selective signal is measured at a point at which the encoder/decoder is connected to the first line. Further, the second line is connected to ground, a resistance of the first line is increased, a further audio signal is output from the encoder/decoder to the second line, and a second frequency-selective signal is measured at a point at which the encoder/decoder is connected to the second line. An amplitude difference between the first and second frequency-selective signals is ascertained.
Abstract: The invention relates to a method to discover Optical Network Units (ONU) with different speed capabilities in an Ethernet Passive Optical Network (EPON) by an Optical Line Termination (OLT), where logical links in the network are identified by Logical Link IDs, and the OLT can transmit and receive data with 1 Gbit/s-speed (1 G) and 10 Gbit/s-speed (10 G), and the discovery process is handled in the OLT by a Multi Point Control Process (MPCP), which exchanges messages as Data Units (MPCPDU) with the ONUs. This is achieved by extending the standard MPCPDUs in a way, that backward compatability is assured.
Type:
Grant
Filed:
May 5, 2009
Date of Patent:
July 23, 2013
Assignee:
Adtran GmbH
Inventors:
Nuno Borges, Marek Hajduczenia, Paulo Miguel Monteiro, Henrique Silva
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.