Abstract: A method for managing upstream burst overhead parameters includes: an Optical Line Terminal (OLT) or an Optical Network Unit (ONU) detects transmission quality of a downlink between the OLT and the ONU; the OLT or the ONU determines the upstream burst overhead parameters suitable for the ONU according to the transmission quality; and the ONU starts to use the upstream burst overhead parameters suitable for the ONU after the switching time determined by the ONU itself or indicated by the OLT. The present invention also provides an ONU and an OLT for managing the upstream burst overhead parameters. The present invention can improve the bandwidth utilization rate and decrease the complexity of indicating the upstream burst overhead parameters in PON system, so that the ONU and the OLT are enabled to flexibly and simply select the upstream burst overhead parameters.

Abstract: The embodiments of the present invention disclose a system, a method, and a device for polarization multiplexing. The method includes: co-direction judgment: after judging that the similarity between the control quantities of the two optical signals meets a predetermined similarity criterion, enabling at least one of the two branches to re-search for the control quantity until the similarity between the control quantities of the two optical signals does not meet the predetermined similarity criterion. The preceding technical solution may substantially prevent the optical signals output by the two branches at a receiving end from having the co-directional state of polarization, without affecting the complexity and implementation cost of the system and the processing time delay of data signals at the receiving end.

Abstract: A method and apparatus for regulating rogue behavior in optical transmission devices. The apparatus, for example, may be implemented in one or more of the ONTs in a PON. The ONT includes an optical transmitter that may be disabled by a command generated by the ONT itself if rogue behavior is detected or suspected. To detect rogue behavior, at least one output indictor, such as LBC or MPC, is monitored during one or more monitoring windows. If monitoring indicates that the optical transmitter is transmitting more than a pre-determined threshold, a suspect rogue flag is set, for example in an I2C register. The register is read, preferably a number of successive times, and a determination is made whether to disable the optical transmitter. In some embodiments, the OLT is queried as part of this determination. The disability may be permanent, until a manual service operation, for example, or temporary.

Abstract: An optical communication serial interface is employed to power up a device from a powered down state to a powered on state. An optical receiver element receives serial optical signals transmitted by at least one optical fiber and converts the received serial optical signals to electrical signals. A low level reception converter detects and decodes the electrical signals to provide data and control words from detected and decoded normal electrical signals for a high level command processor. A power supply maintains low level power to at least the optical receiver element and the low level reception converter of the optical communication serial interface while the device is in the powered down state. The low level reception converter detects a particular abnormal sequence of electrical signals; and in response to detecting the particular abnormal sequence of electrical signals, asserts a control signal to power up the device controllable power supply.

Abstract: This disclosure is directed to techniques for facilitating clock recovery in optical networks. An optical network terminal (ONT) that terminates a fiber link of an optical network includes a clock mode selection module that automatically selects a clock recovery mode based on a type of optical network to which the ONT connects and a type of service provided to one or more subscriber devices coupled to the ONT. By automatically selecting the clock recovery module, an administrator or other user need not provision this aspect of the optical network, thereby reducing administrative tasks and facilitating the provisioning of the optical network. In addition, the techniques enable selection of the most optimal clock recovery mode based on the current state of the optical network.

Abstract: A method and apparatus for implementing optical network quality using bit error rate and chromatic dispersion. According to one embodiment of the invention, a method includes the provision of quality of service in a wavelength division multiplexing optical network that supports a plurality of bit rates. As part of this method, the cumulative noise and cumulative chromatic dispersion for each available path as a whole is determined, where an available path is a series of two or more nodes each connected by an optical link on which a set of wavelengths is available for establishing a lightpath. In addition, different grades of path quality are distinguished based on bit error rate (BER), where BER is based on cumulative noise and bit rate. Furthermore, a minimum path quality is required based on chromatic dispersion decibel penalty, where chromatic dispersion decibel penalty is based on cumulative chromatic dispersion and bit rate.

Abstract: A method of collecting data from an optical channel monitor for monitoring the power of a wavelength-division multiplexed light signal at each wavelength is disclosed. The total light power is analog-to-digital converted by an A/D converter. The data of the total light power which has been analog-to-digital converted is compared with a reference light power by a comparator for each conversion, and when the difference between the total light power and the reference light power exceeds a predetermined threshold, a power fluctuation flag is turned ON. After the comparison, the above process of the analog-to-digital conversion and the comparison is iterated until the optical channel monitor completes the data collection for each wavelength. Thereafter, the processor determines whether the power fluctuation flag is ON or not. When the power fluctuation flag is ON, the processor discards the currently collected data and maintains the data which were collected immediately before.

Abstract: Methods and systems for operating a physical layer device (“PHY”) in an Ethernet network include methods and systems for detecting active link partners and for selecting a mode of operation based on detected active link partners, without user intervention. The PHY monitors fiber link media and copper link media for active link partners. The PHY selects a mode of operation according to detected active link partners. For example, a serial gigabit media independent (“SGMII”) mode of operation is selected when an active copper link partner is detected and an active fiber link partner is not detected. Similarly, a serialize/deserialize (“SerDes”) pass-through mode of operation is selected when an active fiber link partner is detected and an active copper link partner is not detected. The PHY interfaces with the active copper link partner when the SGMII mode of operation is selected. Conversely, the PHY interfaces with the active fiber link partner when the SerDes pass-through mode of operation is selected.

Abstract: A router comprising an interface module (IM), having an optical path and an electrical path and a speed sensor coupled between an input of the router and an input of the IM. The speed sensor is adapted to receive a packet and detect a speed of the IM connection and in response to the speed of the IM connection being above a threshold value, the speed sensor provides the packet to the optical path of the IM and in response to the relative speed being below the threshold value, the speed sensor provides the packet to the electrical path of the IM.

Abstract: An optoelectronic device uses microcode to perform an end of life calculation for the optoelectronic device. In a disclosed example, the optoelectronic device senses environmental and operational parameters under changing conditions during device operation. The optoelectronic device then calculates the end of life for itself based on one or more of the sensed environmental and/or operational parameters. The calculation can be done in real time and using digital logic. The calculation can provide a result in a format which is useful to a host system with which the device is connected. The optoelectronic device may automatically shut itself down upon reaching its calculated end of life.

Abstract: In pattern synchronization for correctly regenerating received data, which is performed in an optical receiver for receiving an optical signal that has been subjected to quadrature phase modulation, signal conduction is quickly established without using duplicate combinations of bit shifting and pattern changing. A control method that does not involve verifying the duplicate combinations generated in modulation formats and pattern synchronization search orders. Specifically, a signal check circuit (40) performs data verification of data multiplexed by a MUX circuit (38) for multiplexing two data strings, and a bit shift pattern change control circuit (41) controls a bit shift circuit (36) and a pattern changing circuit (37) based on a result of the data verification and detects a correct combination of correct regenerated data to establish the signal conduction. At this time, for the bit shift circuit (36) and the pattern changing circuit (37), the duplicate combinations are not verified.

Abstract: The present invention discloses a method for detecting dispersion, overcoming disadvantages of complex configuration and insensitivity to a tiny dispersion of the method and device for detecting dispersion in the prior art. The inventive method includes: obtaining a signal within a predetermined bandwidth range from an optical signal received; obtaining an operated value of power via an operation on the signal within the predetermined bandwidth range; and obtaining amount of system dispersion according to a corresponding relation between the operated value of power and the amount of system dispersion. A device for detecting dispersion is disclosed, including a photoelectric filter operational unit and a processing unit, where an output of the photoelectric filter operational unit is connected to an input of the processing unit. The device for detecting dispersion of the present invention is applicable to an adaptive dispersion compensation system. An optical signal transmission system is further disclosed.

Abstract: A method for channel protection switching of an optical network device, an Optical Transport Network (OTN) device, and a Passive Optical Network (PON) device is provided. The method includes detecting, by the PON device, whether an OTN alarm indication signal is received after discovering a fault. If the OTN alarm indication signal is received, the alarm generated by the PON device is suppressed so that the PON device does not perform channel protection switching. The PON device detects whether an OTN alarm indication signal is received, and suppresses the alarm generated by the PON device so that the PON does not generate futile alarms or lead to futile switching when the OTN fails but the PON works normally.

Abstract: The present invention discloses a method for detecting dispersion, overcoming disadvantages of complex configuration and insensitivity to a tiny dispersion of the method and device for detecting dispersion in the prior art. The inventive method includes: obtaining a signal within a predetermined bandwidth range from an optical signal received; obtaining an operated value of power via an operation on the signal within the predetermined bandwidth range; and obtaining amount of system dispersion according to a corresponding relation between the operated value of power and the amount of system dispersion. A device for detecting dispersion is disclosed, including a photoelectric filter operational unit and a processing unit, where an output of the photoelectric filter operational unit is connected to an input of the processing unit. The device for detecting dispersion of the present invention is applicable to an adaptive dispersion compensation system. An optical signal transmission system is further disclosed.

Abstract: A system assesses a column of gas in an atmosphere. The system includes an optical transmitter for transmitting (a) an online signal tuned to an online wavelength of gas, (b) an offline signal tuned to an offline wavelength of the gas, and (c) an optical signal for providing altimetry data. A modulator is included for modulating the online signal with a first stepped chirp waveform and modulating the offline signal with a second stepped chirp waveform. A processor assesses the column of gas, after receiving a returned online signal, a returned offline signal and a returned optical signal. A lock-in amplifier is included for (a) multiplying a returned signal with the first stepped chirp waveform to obtain a detected online signal, and (b) multiplying the returned signal with the second stepped chirp waveform to obtain a detected offline signal. The processor is configured to remove ground reflections from the optical signal to obtain scattered noise, and assess the column of gas based on the scattered noise.

Abstract: A computer system and method for transmitting LAN signals over transport systems. LAN signals are generated in any client LAN compliant interface. A transceiver receives the client LAN signal in the LAN format. The client LAN signals are not converted to a SONET transmission format at any time before reaching the transceiver. The transceiver then converts the client LAN signal to an internal electrical LAN signal before re-clocking the internal electrical LAN signal. The re-clocked internal electrical LAN signal is then re-modulated into a second LAN signal. The second LAN signal is then transmitted to a transport system.

Abstract: Radio base station equipment is connected to radio transmitting/receiving equipment provided in sectors (S), into which a communication area is divided, by an optical fiber (30), and performs radio communication with mobile terminals located in the respective sectors (S) via the radio transmitting/receiving equipment wherein a delay processing section delays a signal for each sector (S) according to a delay correction value obtained by subtracting a delay amount in each sector (S) from a maximum delay amount of a delay amount measured for each sector (S) and a baseband processing section obtains the signal from each sector (S) delayed by the delay processing section by setting a reception window at a position corresponding to the maximum delay amount.

Abstract: A method for discovering neighboring nodes includes establishing a first optical connection with a first node using a first link. The method also includes detecting a change in the first optical connection. The method further includes initiating a discovery process to detect whether the first node or a second node is using the first link. The method additionally includes, upon detecting a second node using the first link, disabling the first optical connection and establishing a second optical connection with the second node.

Abstract: An example method determines at an optical network monitoring device whether a value for at least one parameter that characterizes an optical signal which traverses a link of an optical coherent network is above a corresponding threshold and sets an alarm indicator when the value is larger than the corresponding threshold. The at least one corresponding parameter is at least one of polarization mode dispersion, polarization dependent loss and chromatic dispersion. An example method may obtains the optical signal from the link of the coherent optical network and determines the value for the at least one parameter, which may entail calculating the value based on the optical signal and filter coefficients of a filter that can be utilized to compensate the optical signal.

Abstract: A high resolution optical fiber length meter, live fiber detector, and reflectance tester (instrument) for single mode applications using a low power, long wavelength laser for generating wide and narrow optical pulses that are launched into a single mode fiber under test. The laser output fiber pigtail is fusion spliced to a singlemode coupler whose output is coupled to the instrument bulkhead connector. A PIN photodiode is fusion spliced to the singlemode coupler to receive the reflected light from the fiber under test. The high resolution hand-held instrument is useful in examining singlemode passive optical networks (PON).

Abstract: A method may include inputting parameters that characterize an optical network, inputting one or more demands to be routed, selecting routes, wavelengths, and wavelength translation nodes simultaneously for the one or more demands of the optical network based on the parameters, where each demand includes a working path and one or more protect paths, and configuring the optical network based on the selected routes, wavelengths, and wavelength translation nodes associated with the one or more demands.

Abstract: Disclosed is an optical line terminal device which includes a media access control (MAC) block configured to convert Ethernet packets and port identifiers into a downstream frame or an upstream frame into the Ethernet packets and the port identifiers; and a central processing unit (CPU) configured to control the MAC block, wherein the MAC block includes a traffic monitoring part which is configured to receive the port identifiers and to provide identifier information of an optical network device according to the port identifiers; and wherein the CPU is configured to generate a control frame for controlling a power supplied to the optical network device, according to identifier information of the optical network device.

Abstract: An optical device includes an optical element that is secured to a base material, a temperature variable element the temperature of which is variable, the temperature variable element being secured to the base material such that light propagates between the temperature variable element and the optical element, a housing that houses the optical element and the temperature variable element, and a heat conducting medium that is disposed at a position that is different from a position of the base material and away from an optical path through which the light propagates, the heat conducting medium physically contacting the optical element and the temperature variable element.

Abstract: A measurement system that includes a power source and a power meter, said power source is configured to generate both a measurement signal and a power source communication signal, and said power meter is in communication with said power source and configured to receive both said measurement signal and said power source communication signal

Abstract: Provided is an optical network unit saving power. The optical network unit may include a processor checking whether at least one downward physical block, the upward physical block and a data switching block operate in an idle mode, sequentially transiting at least one downward physical block, an upward physical block and a data switching block to a sleep mode according to the checking result and sequentially transiting an optical transmission-reception block and the medium access control block to a sleep mode by judging whether or not a medium access control block transits to a sleep mode.

Abstract: An optical transceiver calibration system and manufacturing method to fabricate a dual closed loop control transceiver are provided. The calibration system and method includes measuring an operating temperature and determining operational parameters based upon the operating temperature. The operational parameters may include, for example, a target power for transmitting a digital one, a target power for transmitting a digital zero, a modulation current, and a bias current. A bias may be added to the temperature to account for the difference between the temperature at the temperature sensor and the optical equipment. The operational parameters are preferably calculated independently of each other and are used as initial values during operating modes and allow the control loop to converge more quickly. The optics data is may be scanned electronically via bar code or some other electronic format prior to test. The software residing on the module then calibrates and configures the transceiver.

Abstract: An optical packet switching system includes: an optical packet transmitter device configured to transmit an optical packet signal; and an optical packet switching device configured to route and output an input optical packet signal. The optical packet transmitter device is configured to adjust gap time between optical packets transmitted. The optical packet transmitter device adjusts the gap time to a fixed value defined by time required for switching in the optical packet switching device.

Abstract: A device receives Long Term Evolution (LTE) architecture information, Internet protocol (IP) network architecture information, and transport network information, and determines traffic patterns of a LTE network based on the LTE architecture information. The device also generates proposed LTE metropolitan optical transport networks (OTNs) based on the determined traffic patterns and one or more of the LTE architecture information, the IP network architecture information, and the transport network information. The device further determines transit switching for the proposed LTE metropolitan OTNs, and selects, from the proposed LTE metropolitan OTNs, a metropolitan OTN optimized for the LTE network.

Abstract: A standard test device is used to test the interoperability of a Synchronized Optical Network (SONET) optical interface, e.g., a 1+1 protected SONET interface. In one embodiment, two test sets, under the common control of a master controller, can be connected respectively to the working and protect lines of an optical interface. The controller then operates the test sets to test the operation of the interface under the Automatic Protection Switching (APS) protocol to verify interoperability based on the standards incorporated in the test sets while requiring minimal operator intervention. Alternatively, a single test set can include two connections that are connected, respectively, to the working and protection lines of the interface being tested. The test set can then test the operation of the interface under the APS protocol to verify interoperability based on the standards incorporated in the test set.

Abstract: In accordance with embodiments of the present disclosure, a method for compensation of noise in an optical device is provided. The method may include calculating noise present in an optical carrier signal. The method may also include generating quadrature amplitude modulation input signals, the quadrature amplitude modulation input signals each including a term for compensation of the noise based on the calculated noise. The method may further include modulating the optical carrier signal to generate a modulated optical signal based on quadrature amplitude modulation input signals.

Abstract: An apparatus comprising an individual optical power level calculation (IOPLC) module and a transceiver coupled to the IOPLC module and configured to communicate with a plurality of optical network units (ONUs). Also disclosed is an apparatus comprising a control and management (CM) module, an average power level measurement (APLM) module coupled to the CM module, a first transceiver coupled to the CM module and configured to communicate with an optical line terminal (OLT), and a second transceiver coupled to the CM module and the APLM module, and configured to communicate with a plurality of ONUs.

Abstract: The invention provides a fuzzy control method and apparatus for a signal receiving part in a high speed WDM system, wherein, the method comprises the following steps: step A, obtaining related information of each device in a receiving system and working environment parameter information of the receiving system; step B, according to the related information of each device and the working environment parameter information, finding out fuzzy control parameters which best match the related information of each device and the working environment parameter information from a fuzzy control parameter table stored in the system, and controlling the parameters of each device in the receiving system according to the fuzzy control parameters to make the system reach the best receiving balancing point. The invention can simplify the adjusting steps of the receiver and save the adjusting time.

Abstract: It is provided an optical access system, comprising an optical line terminal which is coupled to another network and optical network units which are coupled to the optical line terminal and to a plurality of user terminals. Each of the optical network units obtains a capacity of a buffer included in the each of the optical network unit and a link speed between the each of the optical network units and one of the plurality of user terminals that is coupled to the each of the optical network units; determines a sleep time based on the obtained capacity and the obtained link speed in a case where no communication frames are transmitted for a given period of time from any one of the plurality of user terminals and the optical line terminal; and sets in a sleep state for the determined sleep time.

Abstract: An optical sampling arrangement for high-speed measurement of the time-varying electric field of an optical input signal utilizes coherent mixing of the optical input signal with a reference laser source in a phase-diverse optical hybrid solution, followed by optical sampling of the coherently-mixed fields at the output of the optical hybrid. The generated streams of optical samples are then detected and signal processed in order to reconstruct a sampled version of the electric field of the original optical input signal.

Abstract: A system and method for measuring latency of an optical transport network includes generating a time stamp, transmitting the time stamp in an optical transport network, and processing the time stamp to measure latency of the optical transport network.

Abstract: In an optical network design apparatus, a constraint setter sets a first constraint that one of alternative values given beforehand is selected as the dispersion compensation amount of each node, sets a first margin value that assumes a nonnegative value, sets a second constraint that the first margin value is equal to or greater than the difference between the residual dispersion and the lower bound of an allowable range, sets a second margin value that assumes a nonnegative value, and sets a third constraint that the second margin value is equal to or greater than the difference between the upper bound of the allowable range and the residual dispersion. A calculation controller generates an objective function including the first, second and third constraints and including a summation of the first and second margin values for all paths, and derives a solution that minimizes the objective function.

Abstract: A testing input module for testing an in-service WDM system is provided. The testing input module includes a first light source configured to emit a first light signal to one or more empty channels of the in-service WDM system; and a tunable second light source configured to emit a second light signal to test the one or more empty channels. The testing input module also includes a first switch module configured to: receive from the first light source and output the first light signal during a first time interval; and receive from the second light source and output the second light signal during a second time interval. The second time interval is a duration wherein a channel power monitoring function of the in-service WDM system is not triggered.

Abstract: A method for allocating and configuring TCM in an embodiment of the present invention includes: configuring the domain that needs TCM in a network and the scope of the domain; determining the ODU service that needs TCM; and allocating TCM automatically according to the ODU service trail and the configured domain; and enabling or disabling the TCM of each level. The present invention enables the system to allocate TCM automatically. The TCM levels can be allocated easily in a centralized way, or for each node in a distributed way. The present invention ensures that the TCM level allocated for the service in the forward direction corresponds to that in the reverse direction. The method is perfectly applicable to the networks of more than six operators. The TCM levels are handled according to the allocated order, thus ensuring correct insertion of AIS and BDI and unique result of insertion.

Abstract: In a PON system having a station side apparatus (OLT) and plural home side apparatuses (ONUs), the station side apparatus includes an uplink frame transfer processing part controlling frame transfer from the home side apparatus to the station side apparatus, a transfer database managing the destination of frame transfer from the station side apparatus to the plural home side apparatuses, a statistical counter part counting transfer data amount for each user, and a user usage state management part managing the user usage situation. The user usage state management part determines the user usage situation (used/unused) based on the state monitoring result of any one or all of parts described above, switches the operation of the uplink frame transfer control part depending on the usage situation and adjusts DBA control frame amount between the station side apparatus and the home side apparatus.

Abstract: The invention generally relates, in one aspect, to an interferometer system. The interferometer system includes a splitter/combiner element (SCE), a first bi-directional optical path, and a second bi-directional optical path.

Abstract: Methods and apparatus for efficiently utilizing an optical control plane distinct from an electronic control plane to facilitate the setup of paths in a dense wave division multiplexing network are disclosed. According to one aspect of the present invention, a method includes receiving a probe arranged determine the optical feasibility of a first path, and determining a probability of success associated with the probe. The probability of success indicates a likelihood that the probe will be successfully routed on the first path to the destination, and is associated with a particular wavelength. A second path on which to route the probe is dynamically identified if the probability indicates a low likelihood of successful routing on the first path. Finally, the method includes determining if a notification associated with the probe has been received, and altering the probability of success based on the notification if the notification has been received.

Abstract: A method, a system, and a computer program product for managing one or more electronic devices. Performance of an electronic device is monitored and presented to a user through a digital agent interface. The performance of the electronic device is controlled automatically by digital agent through the digital agent interface. The invention also enables automatic testing of the electronic device through the digital agent interface by setting up test configurations, activating test signals, and interpreting any error codes that may be generated.

Abstract: An optical transmission device includes an extractor that extracts respective optical signals from optical signals multiplexed from a plurality of optical signals of different wavelengths, a detector that detects wavelengths of the extracted respective optical signals, a storage that stores the wavelengths of the detected respective optical signals, and a processor that is operative to derive trends in wavelength variation of the respective optical signals based on the detected respective optical signals and the respective optical signals stored in the storage, and determines that either one or both of the extractor and the detector cause the wavelengths to be varied when the trends in wavelength variation of two or more wavelengths are the same.

Abstract: The present invention discloses a method for ranging in a passive optical network, and the method includes: obtaining a Round Trip Delay (RTD) between an Optical Line Terminal (OLT) and an Optical Network Unit (ONU); and opening a quiet window used for the ranging for the ONU according to the RTD to perform the ranging on this ONU. The present invention further discloses an apparatus for ranging in a passive optical network, and the apparatus includes: an obtainment module which is configured to: obtain a RTD between an OLT and an ONU; and a ranging module configured to: open a quiet window used for ranging for the ONU to perform ranging on the ONU according to the RTD. The present invention shortens the open time of the quiet window used for the ranging and improves the efficiency of the upstream transmission, and the implementation method is simple and convenient.

Abstract: Method for coordinating measurements and calibrations in a passive optical network, PON, in particular in a Gigabit PON, the method comprising: generating, in an optical line termination (3), OLT, a downstream frame (25), transmitting the downstream frame (25) from the OLT to a plurality of optical network terminations (6.1 to 6.n), ONTs, the downstream frame (25) comprising at least one allocation structure (10) for allocating to at least one targeted ONT (6.1 to 6.n) a time slot for transmitting upstream data, the allocation structure (10) indicating that the type of upstream data to be transmitted during the allocated time slot is measurement data (26) or calibration data.

Abstract: A device for measuring optical latency in a test path includes an optical source to generate an optical signal. An optical modulator modulates the optical signal based on a modulation signal. An output port outputs the modulated optical signal to the test path. An input port receives a return optical signal following propagation through the test path. Latency calculating logic calculates the optical latency for the test path based on the modulation signal and the return optical signal.

Abstract: An apparatus comprising at least one processor configured to implement a method comprising receiving a path computation request comprising at least one path computation constraint, and determining whether there is a path through an optical network that satisfies the path computation constraints. Also disclosed is an apparatus configured to process a data structure comprising a flags field comprising at least one flag having one of an active state or an inactive state, wherein each flag is representative of an optical quality constraint.

Abstract: A fiber optic transceiver (FOT) module is provided that has a circuit board attached to the FOT leadframe. The circuit board, which is typically a printed circuit board (PCB), provides several advantages over typical FOT module designs in that it provides additional surface area for mounting additional components, enables components to be moved from the motherboard into the module, allows the I/O pin count of the FOT module to be increased without increasing the width or footprint associated with the module, allows bond wires to be shortened, provides improved performance over changes in temperature, allows manufacturing yield to be improved, and enables improvements in signal integrity to be realized.

Abstract: A method and system for determining timers in an High Level Data Link Control (HDLC) Traffic Manager (HTM) state machine are disclosed. According to one aspect, the invention provides for determining a transit delay between two nodes by sending a first packet having a delay measurement byte to a second node that is on a link between the first node and the second node. The method also includes receiving a second packet with the delay measurement byte from the second node. The delay measurement byte sent by the second node is adjusted by the second node to indicate its receipt by the second node. A measured delay value is determined. The measured delay value is the delay between a time of sending the first packet to the second node and receiving the second packet from the second node. The measured delay value is determined by the hardware of the first node. Upon determining the measured delay value, timer values of the HTM state machine are set based on the measured delay value.

Abstract: Methods and systems for an optical line termination including instructions stored on a computer-readable medium, the instructions including a digital diagnostic table, and a plurality of entries within the diagnostic table, wherein a first entry is associated with a first optical network unit, the first entry including at least one setting for performing burst mode digital diagnostic processes using a first burst mode transmission received from the first optical network unit.