53 results about "Multi point control protocol" patented technology

One embodiment of the present invention provides a method for facilitating asymmetric line rates in an Ethernet passive optical network (EPON) which includes a central node and at least one remote node. During operation, the system provides a downstream code-group clock, wherein each cycle thereof corresponds to a code group transmitted from the central node to a remote node. The system also provides an upstream code-group clock, wherein each cycle thereof corresponds to a code group received at the central node from a remote node. In addition, the system provides a multi-point control protocol (MPCP) clock, wherein the frequency ratio of the MPCP clock to the downstream code-group clock is different from the frequency ratio of the MPCP clock to the upstream code-group clock, thereby allowing the downstream transmission to be performed at a faster line rate than the upstream transmission line rate.

A method for effectively implementing real time multimedia data transmission in an Ethernet network that operates in a CSMA / CD (Carrier Sense Multiple Access / Collision Detect) scheme. Real time data gets priority over general data, and uses an MPCP (Multi-Point Control Protocol) of the IEEE 802.3ah EPON to prevent a collision from occurring in real time data transmission, and also prevents delay time variation. An RT-IFG (Real Time Inter-Frame Gap) is defined for real time data, shorter than an IFG, to give priority to the real time data over general Ethernet data. The MPCP is used for transmission of real time data without collision between the real time data.

A bandwidth allocation device and a dynamic bandwidth allocation method are provided for differentiated classes of service in an Ethernet Passive Optical Network (EPON), which includes an optical line termination (OLT), an optical distribution network (ODN), and a plurality of optical network units (ONUs). The OLT includes a Multi-Point Control Protocol (MPCP) allocator, which includes a class-based queue state counter and a grant generator. The ONU includes an MPCP requester, which includes a class-based buffer counter and a request generator. The device and the method enable efficient utilization of network resources using class-based grant allocation.

The invention discloses a method for realizing backbone optical fiber protection in an Ethernet passive optical network (EPON), which comprises that: master / backup PON ports are respectively bond with a pair of dedicated communication channels; service is configured at a working PON port, and static data and dynamic data are synchronized to the backup PON port; a value of an MPCP counter of the backup PON port is synchronized and adjusted according to a value of a multi-point control protocol MPCP counter of the working PON port; and fault monitoring is carried out, and the master / backup PON port switching is carried out once a fault happens. The invention also discloses a device for realizing backbone optical fiber protection in an Ethernet passive optical network. Through the method andthe device, the PON ports are bond with the dedicated communication channels, so quick communication between the master / backup PON ports can be realized; and by adjusting the MPCP counter of the backup PON port, the EPON does not need to re-register ONU during protection switching, the service restoration time is shortened, and the protection switching performance is improved.

A communication device includes a resource allocation module to allocate coax resources for signals to be transmitted over a cable plant and a coax physical layer device to transmit the signals over the cable plant using the allocated coax resources. The communication device also includes a media access controller, coupled to the multi-point control protocol implementation and the coax physical layer device, to provide to the coax physical layer device a bitstream that includes data for the signals and also includes information specifying the allocated coax resources.

A method and apparatus for receiving burst data in an OLT of an EPON are provided. The method includes the steps of: a) receiving burst data from the plurality of ONUs; b) generating a multipoint control protocol (MPCP) LOS signal for reducing a synch time of the burst data; c) reducing the synch time in response to generation of the MPCP LOS signal; and d) recovering the received burst data by performing a code-group sort in a period where the MPCP LOS signal is not generated.

The invention discloses a user level protocol and QoS (Quality of Service) based dynamic wavelength bandwidth distribution method in a WDM-EPON (Wavelength Division Multiplexing-Ethernet Passive Optical Network). The user level protocol and QoS based dynamic wavelength bandwidth distribution method in the WDM-EPON comprises the steps of: extending a frame structure in an existing MPCP (Multi-Point Control Protocol) and enabling an OLT (Optical Line Terminal) to support multiple uplink wavelengths by using the extended MPCP; dividing services into three levels, .i.e., an EF service, an AF service and a BE service, wherein the EF service is firstly subjected to online real-time scheduling, and the bandwidth distributed to the EF service is a requested bandwidth and transmitted on an appointed wavelength; setting minimum guaranteed bandwidths for the AF and BE services based on the user levels (a high-level user, a middle-level user and a low-level user) and carrying out offline scheduling, to be specific, firstly, scheduling the AF / BE service of the senior user (first scheduling the AF service and then scheduling the BE service), and then scheduling the AF / BE services of the middle-level user and the low-level user according to the following sequence (the AF service of the middle-level user, the AF service of the low-level user, the BE service of the middle-level user and the BE service of the low-level user). According to the dynamic wavelength bandwidth distribution method, the time delay can be reduced, and the bandwidth utilization rate and the QoS of the user with high priority are improved.

The embodiment of the invention relates to the field of communication and particularly discloses an optical transmission control method in an optical network, an optical network device and a system. The method comprises the following steps of: generating a multi-point control protocol (MPCP) message, wherein the MPCP message comprises an identification of a detected ONU (Optical Network Unit) and time interface information which is distributed to the detected ONU and used for sending an uplink optical signal; sending the MPCP message to the detected ONU; receiving the uplink optical signal sent by the detected ONU in the distributed time interval; detecting the received uplink optical signal; and determining the optical power of the uplink optical signal. The invention avoids the bandwidth waste caused by distributing the bandwidth to the detected ONU through a DBA module so as to detect the optical power in an optical power detection process in the prior art.

The invention provides an ONU (Optical Network Unit)-transferable TWDM-PON (Time and Wavelength Division Multiplexed Passive Optical Network) system which can realize flexible transfer of online users on different active wavelengths via a specific protocol, and specifically realizes information interaction of an ONU and an OLT (Optical Line Terminal) in the migration process under the existing EPON (Ethernet Passive Optical Network) protocol through redefining some MAC (Media Access Control) protocol frames. The ONU-transferable TWDM-PON system adopts the technical scheme comprising the steps as follows: a, the ONU is registered in the system via the IEEE802.3ah multi-point control protocol, and a unique logical link identifier and a wavelength identifier are distributed for the new registered ONU; and b, the OLT requires the ONU to perform transfer via the specific protocol, and then the ONU exits the registration and performs re-registration according to the requirements of the OLT. According to the invention, under the situation of not influencing service quality for users, flexible transfer of online users on different active wavelengths can be realized via the specific protocol.

One embodiment provides a system that performs protection switching in an Ethernet passive optical network (EPON), which includes an optical line terminal (OLT) and at least one optical network unit (ONU). The system is configured with at least one redundant component for the OLT and / or ONUs, wherein the redundant component can be optical or electrical, and can be a port, line card or link. The system provides protection by detecting a failure, and switching automatically to the redundant components to reduce service disruption time. The protection switching comprises: preserving the existing configuration over the loss of at least one of a multiple-point control protocol (MPCP) message; an operations, administration and maintenance (OAM) message; and a signal on the physical layer. The system recovers from the failure without performing ONU discovery.

The invention relates to the technical field of optical fiber-coaxial cable hybrid network access. Aiming at the limitations of the existing EoC technology application and combining with EPON technology application, the invention provides a multi-point control protocol based Ethernet passive electrical network (Ethernet Passive Electronic Network-EPEN), which comprises head end equipment connected with the FTTx optical node of an Ethernet passive optical network, terminal equipment (ENU) connected with user units and a passive electric distribution network (EDN), wherein the EDN consists of coaxial cables and one or more passive power splitters and provides electric channel connection between the ELT and the ENU, and a physical layer adopts the orthogonal frequency division multiplexing technology (OFDM); and a data link layer adopts the multi-point control protocol (MPCP), so that the two-way Ethernet data services carry in a point-to-multi-point coaxial access network. The invention can effectively realize the two-way transformation of an HFC network to which the EPON and the EPEN access in a compositing way, and has improved technology advancement, user access bandwidth and supported maximum number of users compared with other EoC technical standards.

The method comprises: in the OA&M (operation, administration and maintenance) message expanded by a specified organization, setting the threshold of the queue set numbers supported by optical network unit (ONU) and the threshold of length of each queue in said queue set, for use in the data transmission and configuration between the OLT (optical line terminal) and the ONU; according to the preset thresholds above, the ONU sets the queue set field presenting the queue length and the queue set numbers in the REPORT frame of the multi point control protocol; the ONU reports the REPORT frame to the OLT; according to the numbers of uplink queue set and the length of each queue, the OLT authorizes the uplink bandwidth allocated by OLT. The invention can make the dynamic bandwidth allocation in the passive optical network and solves the intercommunication problem between ONU and OLT provided by multi venders.

A passive optical network (PON) equipment capable of displaying a connection state and a logical link identifier (LLID) is provided, which aims at solving a problem that equipments in the conventional PON system cannot display connection state and LLID. The PON equipment displays the connection state and the LLID through a programmable logic element and a display unit by utilizing characteristics of multi-point control protocol (MPCP) and LLID, so as to achieve the efficacy of displaying the connection state and the LLID.

A method for detecting-eliminating fault of passive optical network system includes querying fault state information of system terminal by system office end through fault query field of message, reporting fault state to system office end by system terminal through query response field of message, analyzing fault state by office end device, sending forced power failure command to fault system terminal through forced power failure command field of message if that system terminal is fault is confirmed and automatically switching off power supply after command is received by fault system terminal.

A MAC (Medium Access Control) control block for controlling transmission of data between a plurality of MAC clients and a plurality of MACs in an Ethernet passive optical network (EPON) is provided. The MAC control block includes the plurality of MAC clients and the plurality of MACs associated with the MAC clients for forming a frame for data transmission; a plurality of optical multipoint (OMP) blocks connected between the MAC clients and the MACs for implementing a multipoint control protocol (MPCP); and a multipoint gating control block for controlling the OMP blocks so that when any one of the OMP blocks is transmitting the data, the other OMP blocks are prevented from transmitting data.

The method comprises: optical line terminal (OLT) sends a strobe finding message to the optical network unit (ONU); the ONU sends a registration request message to the OLT; after receiving the registration request, the OLT sends the registration message to the ONU and starts up the timer; after the timer is time out, the OLT immediately sends the standard strobe message to the ONU to allocate the bandwidth authorizing window for the registration confirmation message; if the OLT doesn't receive the registration message in the authorizing window, then deleting the registration for the ONU and restarting the finding and processing procedure; if the OLT receives the registration confirmation message in the authorizing widow, then the finding and processing procedure of the ONU is implemented.

The invention discloses a method, a system and a device realizing message transmission in the Ethernet passive optical network (EPON). The method is as follows: a 10 G optical line terminal (OLT) is additionally arranged in the EPON to be used as a transit station of a 10 G EPON optical network unit (ONU) and a 1G EPON OLT transit station to recognize the up message directly coming from a 10 G EPON ONU, judge whether the up message is the multiple-point control protocol (MPCP) message, and only transmit the MPCP message to a 1G EPON OLT. The system comprises an original EPON OLT, an additionally-arranged 10 G EPON OLT and a 10 G EPON ONU. The device comprises a logic unit, a 10 G EPON OLT transceiver and a 1 G EPON ONU transceiver. The invention can guarantee that no conflict exists in the up direction without additionally arranging a unified scheduling module.

The invention discloses a method for discovering an Ethernet operation and maintenance (OAM) link, which comprises the following steps: introducing an RxRmtId filter field in a resolution state machine for checking legal OAM protocol data unit (OAMPDU) frame; when the identification information of the OAMPDU frame and the counter point switching equipment identifier of the RxRmtId are not same, checking the existence of the counter point switching equipment identifier of the RxRmtId, in the case of existence, initializing; otherwise, judging that the counter point switching equipment identifier of the RxRmtId is a dynamic identifier or a stationary identifier, in the case of a stationary identifier, generating an occupation failure log or alarm and discarding the OAMPDU frame participating in occupation; and in the case of a dynamic identifier, searching whether the daemon timer is effective. The method can reliably realize point-to-point Ethernet OAM discovery in a point-to-multipoint environment which does not support multi-point control protocol (MPCP) or a point-to-point environment with illegally accessed equipment, so as to improve the security and robustness of Ethernet OAM discovery.

One embodiment of the present invention provides a method for facilitating asymmetric line rates in an Ethernet passive optical network (EPON) which includes a central node and at least one remote node. During operation, the system provides a downstream code-group clock, wherein each cycle thereof corresponds to a code group transmitted from the central node to a remote node. The system also provides an upstream code-group clock, wherein each cycle thereof corresponds to a code group received at the central node from a remote node. In addition, the system provides a multi-point control protocol (MPCP) clock, wherein the frequency ratio of the MPCP clock to the downstream code-group clock is different from the frequency ratio of the MPCP clock to the upstream code-group clock, thereby allowing the downstream transmission to be performed at a faster line rate than the upstream transmission line rate.

The invention discloses a method for realizing the timestamp synchronization of an active optical line terminal (OLT) and a standby OLT. The method comprises that: the active OLT synchronously transmits round trip time (RTT) values with all online optical network units (ONU) to the standby OLT; and the standby OLT selects a reference ONU, and sets a value of a local timestamp counter according to a timestamp in a multipoint control protocol (MPCP) frame and an RTT value of the active OLT with the reference ONU after receiving the MPCP frame of the reference ONU. The invention simultaneously discloses a system for realizing the timestamp synchronization of the active and standby OLTs. By the scheme provided by the invention, timestamp counters of the active and standby OLTs in an Ethernet passive optical network (EPON) backbone optical fiber protection system can be effectively synchronized, and the offline state of the ONU caused by timestamp drift in handover can be avoided, thereby ensuring that the handover can be finished quickly. Moreover, requirements on the ONUs are relatively lower, and compatibility with all conventional ONU equipment can be achieved.

The invention belongs to the technical field of intelligent substation network security, and particularly relates to a transformer substation adaptive network based on difference detection and a secure clock synchronization method thereof. The network comprises optical network units ONU, a synchronous optical line terminal OLT and an EPON protocol processor; two interfaces of each ONU have the same state all the time, and redundancy configuration of master and slave links is adopted; and the EPON protocol processor communicates with the ONU through a multipoint control protocol. The method comprises the following steps: the EPON protocol processor transfers a timestamp to each ONU; the OLT compares whether two interfaces of the ONU receive messages within a specified time difference and whether the synchronous timestamps carried in the messages are consistent, if not, a security threat exists, and the time check is not adjusted; and if so, the OLT detects whether a round trip time RTT difference exceeds a specified threshold, if so, the security threat exists, and the time check is not adjusted; and if the RTT difference does not exceed the threshold, ONU registration is completed, and normal communication is started.

The invention relates to a method and device for registration lighting for an ONU (optical network unit) device. The method is characterized by comprising the following steps of transmitting data frame based on MPCP (multi point control protocol) between PON (passive optical network) interfaces, corresponding to ONU devices, in PON chips of the ONU devices and an OLT (optical line terminal) device; directly outputting a corresponding drive signal after analyzing and judging the received data frame through the PON chips so as to adjust the states of panel lamps, corresponding to the ONU devices, on the OLT device; or outputting a corresponding lighting signal to a logic chip after judging the received data frame through the PON chips, and outputting the corresponding drive signal after analyzing and judging the lighting signal through the logic chip so as to adjust the states of the panel lamps. By adopting the method and device, the conditions of the ONU devices under the PON interfaces, including normal registration of the ONU devices, interaction between the PON interfaces and the ONU devices, no registration of the ONU devices under the PON interfaces or no registration signal from the PON interfaces, can be visually displayed, and the prompt response and accuracy in judgment can be realized.

The invention discloses passive optical network equipment that can display online state and logical link identifier, and aims at solving the problem that the equipment in the prior passive optical network system fails to display the online state and the logical link identifier. According to the characteristics of the multi-point control protocol and the logical link identifier, the invention combines a programmable logic device and a display unit to display the passive optical network equipment of the on-line state and the logical link identifier, thus leading the passive optical network equipment to achieve the efficacy of displaying the online state and the logical link identifier.

The invention provides a WIFI-based TDMA backhaul transmission method. The method comprises the following steps: a central node operates an MPCP, and access control is carried out on a to-be-accessed backhaul transmission node; time synchronization is carried out on each backhaul transmission node accessed to a backhaul transmission network, a ranging algorithm synchronizes the distance and time information between backhaul transmission nodes, and corresponding time slices are distributed; after the corresponding time slices are distributed, each backhaul transmission node transmits data in each specified time slice, and each backhaul transmission node can receive data at any time. According to the WIFI-based TDMA backhaul transmission method, an MAC layer based on a 802.11 protocol is changed, a CSMA / CA technology is not used any more and is changed into a multi-point control protocol (MPCP) based on time slice rotation, the MPCP is operated between the central node and the backhaul transmission node, the MPCP of the central node is in charge of arbitrating and distributing data transmission of multiple backhaul transmission nodes, collisionless distribution of channel resources is ensured, and the backhaul transmission data efficiency is greatly improved.