34 results about "Gigabit ethernet passive optical network" patented technology

A system and method for managing link status in Gigabit Ethernet passive optical network (GE-PON) units (ONUs) is disclosed. The GE-PON comprises one or more ONUs allocated data transmission periods, respectively. Each of the ONUs sends a report signal and a data signal in a corresponding one of the allocated data transmission periods. The report signal contains a signal to request allocation of a bandwidth for data signal transmission in a next window period. The GE-PON further comprises an optical splitter having its one side connected with the ONUs and its other side connected with at least one optical communication channel. The optical splitter switches an input signal to a desired destination. The GE-PON further comprises an optical line terminal (OLT) for determining whether the report signal is received, identifying a specific one of the ONUs having sent the report signal when the report signal is received, determining whether the data signal is received from the specific ONU in a specific one of the data transmission periods allocated to the specific ONU, and discriminating and managing a link status of the specific ONU in accordance with the determination made.

A Gigabit Ethernet passive optical network (GE-PON) for securely transferring data through exchange of an encryption key comprises an optical line terminal (OLT) for encrypting a secret key using a public key received through a transmission medium, transmitting the encrypted secret key, encrypting data using the encrypted secret key, and transmitting the encrypted data, and at least one optical network terminal (ONT) for transmitting the public key to the OLT, decrypting the encrypted secret key transmitted from the OLT using a private key, and decrypting the data encrypted with the encrypted secret key, transmitted from the OLT, using the decrypted secret key.

A GE-PON (Gigabit Ethernet-Passive Optical Network) system is provided that configures upstream and downstream frames on the basis of a variable-length Ethernet frame. The GE-PON system employs TDM (Time Division Multiplexing) for upstream packet transmission in a tree structure for a point-to-multipoint connection. A structure of a frame format is also provided that is capable of effectively accommodating Gigabit Ethernet traffic in the GE-PON system and a method is provided for implementing various functions such as initial ONU registration, late ONU registration, ranging, and dynamic bandwidth allocation in the GE-PON system.

A GE-PON (Gigabit Ethernet-Passive Optical Network) system is provided that configures upstream and downstream frames on the basis of a variable-length Ethernet frame. The GE-PON system employs TDM (Time Division Multiplexing) for upstream packet transmission in a tree structure for a point-to-multipoint connection. A structure of a frame format is also provided that is capable of effectively accommodating Gigabit Ethernet traffic in the GE-PON system and a method is provided for implementing various functions such as initial ONU registration, late ONU registration, ranging, and dynamic bandwidth allocation in the GE-PON system.

A GE-PON (Gigabit Ethernet Passive Optical Network) system and media access control method for the same are disclosed. In the GE-PON system, by employing MAC attributes of the gigabit Ethernet frames, an OLT (Optical Line Termination) transmits a downstream window containing both a control frame having timeslot position and size information in association with at least two ONUs and Ethernet frames to an ODN (Optical Distribution Network). The OLT analyzes contents of RAUs in an upstream window transmitted from the ONUs in a TDMA method and received from the ODN, and permits timeslot position and size corresponding to each of the ONUs. A plurality of ONUs, connected to the ODN, have their respective timeslot position and size allocated in response to their respective information contained in the control frame of the downstream window. RAU frames are transmitted having queue information and Ethernet frames associated with the allocated timeslots. As a result, by the above MAC structure of the GE-PON system, the OLT can be quickly intercommunicated with a plurality of ONUs.

A Gigabit Ethernet passive optical network (GE-PON) having a double link structure is disclosed. The GE-PON includes an optical line terminal (OLT), a plurality of optical couplers, and a plurality of optical network units (ONUs). The OLT sets up an active link and a standby link in response to a registration request message received over an optical cable. Each of the ONUs is doubly connected with the OLT via the optical cable and is adapted to transmit the registration request message to the OLT, form the active link with the OLT via the optical cable if it receives an active registration message transmitted from the OLT in response to the registration request message, and form the standby link with the OLT via the optical cable if it receives a standby message from the OLT. The optical couplers are disposed between the OLT and each of the ONUs to doubly interconnect them via different optical cables.

The invention provides an ultrahigh-speed burst mode clock restoring circuit based on a gate-control oscillator, comprising the gate-control oscillator, four frequency dividers, a frequency-discrimination device, a charge pump, a low-pass filter, an interior clock buffer and a semi-velocity data restoring circuit. The ultrahigh-speed burst mode clock restoring circuit is characterized in that an output clock of the gate-control oscillator can restore a clock signal from input data of any phases within a plurality of bit times when data turn over under traction action of the input data, wherein the phase of the clock signal is aligned with the phase of the input data; the four frequency dividers, the frequency-discrimination device, the charge pump, the low-pass filter and the interior clock buffer are used for analyzing relation of output lock signal frequency and reference frequency and providing a control signal for the gate-control oscillator, and the semi-velocity data restoring circuit resets the data according to the restored clock signal to generate a restored data signal. The ultrahigh-speed burst mode clock restoring circuit disclosed by the invention is suitable for an optical fiber communication system, and in particular relates to a burst mode optical communication system taking a ten-gigabit Ethernet passive optical network technology as representation.

The invention provides an access node device based on a gigabit-Ethernet passive optical network. The access node device comprises a power module, an access node MAC layer module, a high-speed physical layer module and a user service processing module. The power module is respectively and electrically connected with the access node MAC layer module, the high-speed physical layer module and a photovoltaic conversion module. The photovoltaic conversion module is in communicating connection with the access node MAC layer module through the high-speed physical layer module. The invention further provides a corresponding system. According to the device and system, the compatibility of the gigabit Ethernet can be better, the optical fiber network bandwidth can be larger, and the outside electromagnetic environment interference resisting performance is enhanced. An FPGA logical circuit module is adopted for achieving network logical link layer protocols, and the real-time performance of network transmission is improved by combining a light burst transmission technology and a high-speed physical layer serial chip. The device and system are simple in overall frame, and can fast construct an optical fiber network on the industrial site by being matched with central nodes.

The invention discloses a regenerating optical network of a gigabit Ethernet passive optical network and a gigabit Ethernet optical network system. The regenerating optical network comprises a wavelength division multiplexer, an optical-electrical conversion unit and an electrical-optical conversion unit. The wavelength division multiplexer is used for receiving optical signals, demultiplexing the optical signals and transmitting the signals to the optical-electrical conversion unit, the optical-electrical conversion unit is used for optical-electrical signal conversion of the received optical signals, processing electrical signals obtained during conversion, and transmitting the electrical signals to the electrical-optical conversion unit, and the electrical-optical conversion unit is used for regenerating optical signals through the received electrical signals, and the optical signals are multiplexed by the wavelength division multiplexer and transmitted to a receiving terminal. Although the regenerating optical network of the gigabit Ethernet passive optical network is not used as an active device, the transmission of large splitting ratio and ultra-long distance can be achieved through the gigabit Ethernet passive optical network; the cost is lower; and the implementation is more flexible, difficulties in operation are greatly reduced, and the product reliability is effectively improved.

A method and apparatus for transmitting data from an optical network unit (ONU) to an optical line termination (OLT) in a Gigabit Ethernet passive optical network (GE-PON) on the basis of a time division multiple access (TDMA) scheme are provided. A measurement of a data transmission time when the data is transmitted to the OLT is obtained, and the measured data transmission time is compared with a predetermined normal transmission time. The transmission of the data is maintained if the measured data transmission time is determined to be less than or equal to the normal transmission time from the comparison result. However, if the measured data transmission time is determined to be greater than the normal transmission time, the transmission of the data is stopped.

One embodiment provides a pluggable optical line terminal (OLT). The OLT includes a bi-directional optical transceiver configured to transmit optical signals to and receive optical signals from a number of optical network units (ONUs), an OLT chip coupled to the optical transceiver and configured to communicate with the ONUs through the optical transceiver, and a pluggable interface coupled to the OLT chip and configured to electrically interface between the OLT chip and a piece of network equipment. The optical transceiver, the OLT chip, and the pluggable interface are contained in an enclosure complying with a form factor, thereby allowing the pluggable OLT to be directly plugged into the network equipment.

A Gigabit Ethernet passive optical network (GE-PON) having a double link structure is disclosed. The GE-PON includes an optical line terminal (OLT), a plurality of optical couplers, and a plurality of optical network units (ONUs). The OLT sets up an active link and a standby link in response to a registration request message received over an optical cable. Each of the ONUs is doubly connected with the OLT via the optical cable and is adapted to transmit the registration request message to the OLT, form the active link with the OLT via the optical cable if it receives an active registration message transmitted from the OLT in response to the registration request message, and form the standby link with the OLT via the optical cable if it receives a standby message from the OLT. The optical couplers are disposed between the OLT and each of the ONUs to doubly interconnect them via different optical cables.

The invention discloses a regenerating optical network of a gigabit Ethernet passive optical network and a gigabit Ethernet optical network system. The regenerating optical network comprises a wavelength division multiplexer, an optical-electrical conversion unit and an electrical-optical conversion unit. The wavelength division multiplexer is used for receiving optical signals, demultiplexing the optical signals and transmitting the signals to the optical-electrical conversion unit, the optical-electrical conversion unit is used for optical-electrical signal conversion of the received optical signals, processing electrical signals obtained during conversion, and transmitting the electrical signals to the electrical-optical conversion unit, and the electrical-optical conversion unit is used for regenerating optical signals through the received electrical signals, and the optical signals are multiplexed by the wavelength division multiplexer and transmitted to a receiving terminal. Although the regenerating optical network of the gigabit Ethernet passive optical network is not used as an active device, the transmission of large splitting ratio and ultra-long distance can be achieved through the gigabit Ethernet passive optical network; the cost is lower; and the implementation is more flexible, difficulties in operation are greatly reduced, and the product reliability is effectively improved.

Based on sectional type list of tail coordinates about quantity of subchannel bandwidth occupied as prepared distribution scheme, assigned quantities of subchannel bandwidth are realized. Using integral processing unit collects quantities of subchannel bandwidth. Sending out signal of requesting bandwidth according to size authorized by EPON system completes granting for quantity information so as to realize bandwidth distribution of up going flow on EPON system. Steps for bandwidth distribution are as following: interface of microprocessor sends out enable signal for reading / writing control; based on prepared distribution scheme, bandwidth designator converts and designates subchannel bandwidth to realize rearrangement of main / standby multiplexing; integral bucket corrects quantities of subchannel bandwidth occupied; based on request, authorization generating circuit sends signal of leaking command to control leaking operation of integral bucket so as to realize distribution.

The invention discloses optical amplification equipment applied to a gigabit Ethernet passive optical network. The optical amplification equipment is characterized by comprising a laser device of an optical line terminal (OLT), a laser device of a passive optical network unit (ONU), a first serial-to-parallel converter, a second serial-to-parallel converter and a controller, wherein the first serial-to-parallel converter receives serial electric signals sent by the laser device of the passive OLT and converting the serial electric signals into parallel electric signals, the controller extracts Gate messages in the parallel electric signals and obtains an opening time window, the second serial-to-parallel converter converts parallel signals sent by the controller into serial signals and then sends the serial signals to the laser device of the passive ONU, the serial signals are converted into amplified optical signals, the amplified optical signals are sent to the passive ONU through the opening time window, and therefore burst transmission of the optical signals is achieved. The optical amplification equipment can be placed at any position in a PON system, is free from limit of topology and meanwhile can be used for further processing protocol parts, and monitoring of signal quality and analysis of communication transmission content can be achieved at the same time.

The invention provides an ultrahigh-speed burst mode clock restoring circuit based on a gate-control oscillator, comprising the gate-control oscillator, four frequency dividers, a frequency-discrimination device, a charge pump, a low-pass filter, an interior clock buffer and a semi-velocity data restoring circuit. The ultrahigh-speed burst mode clock restoring circuit is characterized in that an output clock of the gate-control oscillator can restore a clock signal from input data of any phases within a plurality of bit times when data turn over under traction action of the input data, wherein the phase of the clock signal is aligned with the phase of the input data; the four frequency dividers, the frequency-discrimination device, the charge pump, the low-pass filter and the interior clock buffer are used for analyzing relation of output lock signal frequency and reference frequency and providing a control signal for the gate-control oscillator, and the semi-velocity data restoring circuit resets the data according to the restored clock signal to generate a restored data signal. The ultrahigh-speed burst mode clock restoring circuit disclosed by the invention is suitable for an optical fiber communication system, and in particular relates to a burst mode optical communication system taking a ten-gigabit Ethernet passive optical network technology as representation.

The invention relates to a controlled multicasting system which is used for a kilomega Ethernet source-free optical network. The system comprises an optical network unit, an optical fiber line terminal, a charging system and a terminal user, wherein the optical network unit further comprises a seizing package engine module used for establishing and maintaining a corresponding relationship betweenthe MAC address of the terminal user and a network user port. Under the precondition of ensuring the normal application and the multicasting flow acquisition of a user, the invention enables the multicasting flow rate not to be copied to an illegal user by the optical network unit, realizes the control of user authorities and the controllable and manageable operation of the service, and also greatly saves the bandwidth between the user and the optical network unit.

A test method for the interference of an ONU (Optical Network Unit) to CATV (Community Antenna Television) channels includes the following steps: (1) building a digital TV interference test system including a GEPON (Gigabit Ethernet Passive Optical Network) OLT (Optical Line Terminal), an optical fiber splitter, a multi-channel digital signal source, an optical transmitter and a spectrum analyzer;(2) testing the spectrums of real interference signals in different scenes in the system by setting optical input under different conditions, generating different signal spectrograms, and analyzing the level intensity and frequency point of interference signals generated by an ONU module, the distribution of interference signals and the devices generating interference sources; (3) analyzing whichCATV channels are interfered according to the spectrums generated under different conditions after the interference signals pass through a CATV module; and (4) verifying the specific influence of theinterference signals on TV signals through a CATV multi-channel digital signal source, finding out the interference path of the ONU to the CATV module, and confirming a solution to the interference based on the spectrograms. The test of the interference of an ONU module to the TV channels of a CATV module in an ONU+CATV two-in-one terminal is realized. The interference intensity can be tested, and the interference path of the ONU to the CATV module can be found out.