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: Techniques, apparatus and systems are described for an optical line terminal (OLT) operable in a passive optical network (PON) system to isolate and mitigate the behavior of a rogue optical network unit (ONU) that transmits optical power up the optical distribution network (ODN). In one aspect, a method of mitigating the behavior of rogue ONUs can include detecting the presence of a rogue ONU on the PON system, and transmitting, based on the detection, a message addressed exclusively to the ONUs that have not yet been discovered or identified by the OLT.

Abstract: The invention discloses a time synchronization method and system for a passive optical network (PON) system to solve the problem that an ONU cannot be synchronized with an OLT accurately in the PON. The invention implements the time information synchronization between the ONU and the OLT by using a management path. The time information includes an information transmission delay between the ONU and the OLT and the sending time identifier information of the time information. The invention avoids the technical defect of the unfixed delay for an upper layer protocol data message in a GPON by using the characteristic that a PLOAM message or an OMCI message is not segmented during the transmission thereof in the PON, thus ensuring every ONU can be synchronized with the OLT accurately.

Abstract: Disclosed in the present invention are an alarm processing method and device for a PON system in power-saving mode, for solving the technical problem that the PON system cannot process the alarm or exception message after the ONU enters power-saving state and the management server is misled to deem that the system is abnormal. In the present invention, when the OLT detects the alarm generated for a certain ONU, it acquires the current power-saving working state of the ONU, and if the ONU is currently in power-saving state (such as doze state, i.e. Tx mode), the OLT suppresses, discards or shields the relevant alarm by the ONU currently in power-saving state. By way of the present invention, the alarm processing pressure can be alleviated and the real state of the ONU can be reflected.

Abstract: A DPOE system and a service auto-configuration method and network based on that system are provided, wherein, the DPOE system includes an acquisition unit, an analyzing unit and a configuration unit; the service auto-configuration network includes a DPOE system, a back-office management system and an ONU; the service auto-configuration method based on that system includes: the DPOE system acquiring a configuration file from the back-office management system, wherein the configuration file includes configuration information of the ONU and configuration information of an OLT in the DPOE system; the DPOE system analyzing the configuration file and obtaining the configuration information of the ONU and the configuration information of the OLT; configuring the OLT locally and configuring the ONU via a management channel between the OLT and the ONU. Thus the service can be opened without performing further configuration to the OLT individually after the process of the ONU initialization is completed.

Abstract: The present invention provides a tunnel gateway device used for: receiving a domain name system (DNS) server address for an inner layer or outer layer service of a tunnel configured by an automatic control server according to a management protocol; and taking its own address as the DNS server's address and sending the address to a client, or sending the configured DNS server address to the client. The present invention also provides a method for obtaining the DNS, and the present invention implements the DNS server distribution and obtaining of the DNS without depending on the address protocol.

Abstract: The disclosure provides a method and system for realizing power saving mechanism management between an Optical Network Unit (ONU) and an Optical Line Terminal (OLT). The method includes: passing power saving information between the ONU and the OLT through an extended Operation Administration and Maintenance (OAM) frame; closing/opening an optical module of the ONU based on the obtained power saving information. With the method of the disclosure, the optical module is closed in time when the optical module of the ONU is not needed, thus reducing power consumption of the ONU, and enabling interaction between the ONU and the OLT to meet the requirement for power saving and emission reduction.

Abstract: A method for encrypting multicast services in a passive optical network system is provided in the present invention, and the method includes: an Optical Line Terminal (OLT) generating a public key, and using the public key to encrypt the multicast service data in a bearer channel and then transmitting the encrypted data, the multicast service data in the same one bearer channel being encrypted using the same public key; and said OLT sending the public key, which is used to encrypt the multicast service data, via a management control channel to an Optical Network Unit (ONU) which is activated successfully and requests to receive said multicast service data. A device for encrypting multicast services in a passive optical network system is also provided in the present invention.

Abstract: A method for implementing the subscriber port positioning by broadband access equipments, includes: when the subscriber initiates an access request, the multi-port terminal equipment captures the access request message, adds the subscriber basic information into the access request message, and transmits it to the office equipment; the single-port terminal equipment forwards the access request message to the office equipment directly; the office equipment captures the access request message, adds the terminal basic information into the access request message and forwards it to the broadband access server; for the multi-port terminal equipment, the terminal basic information and the subscriber basic information comprises the subscriber port positioning information; for the single-port terminal equipment, the terminal basic information is taken as the subscriber port positioning information; after the broadband access server receives the access request message, it extracts the subscriber port positioning informa

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 disclosure provides a method for quickly updating ranging results of optical network units by an optical line terminal. The method comprises the following steps: an Optical Line Terminal (OLT) distributes an acquired ranging difference to all the Optical Network Units (ONUs); and the current ONU implements quick updating of the ranging result of the current ONU itself according to the acquired ranging difference. The disclosure also provides a system for quickly updating ranging results of ONUs by an OLT, wherein a distributing unit in the OLT is used for distributing an acquired ranging difference to all the ONUs; an updating unit in the ONU is used for implementing quick updating of ranging result of the current ONU itself according to the acquired ranging difference. the method and system of the disclosure can save the quantity of messages, enable quick switching in protection status, thus implementing protection switching efficiently.

Abstract: The present invention discloses a method for instructing enabling/disabling Forward Error Correction (FEC) function. The method comprises: presetting an instruction identifier of an FEC status; transmitting an instruction identifier of an FEC status of an Optical Network Unit (ONU) and the Identity (ID) of the ONU by an Optical Line Terminal (OLT), wherein the instruction identifier of the FEC status of the ONU is corresponding to the ID of the ONU; and enabling or disabling its own FEC function by the ONU according to the received instruction identifier corresponding to its own ID. The present invention also discloses a system for instructing enabling/disabling FEC function, which comprises an OLT and an ONU. The method and system of the present invention can solve the problem that the ONU cannot determine the instruction from the OLT due to an error code.

Abstract: A device and method for preventing Internet Protocol version 6 (IPv6) address being fraudulently attacked are disclosed in present invention, and the method comprises: detecting a Neighbor Solicitation (NS) data packet; judging whether the source address of the data packet is an unspecified address or not; if yes, checking the IPv6 address in the Target Address field and judging whether there is a corresponding binding table item or not; otherwise, collecting the correlative information and creating a binding table item corresponding to the IPv6 address; and constituting a data flow forwarding and control strategy according to the data in the binding table item, and applying the strategy to the data flow forwarding and control. The present invention solves the problem that the address is fraudulently attacked in the IPv6 network in which addresses are assigns based on various address assignment mechanisms.

Abstract: The invention discloses a time synchronization method and system for a passive optical network (PON) system to solve the problem that an ONU cannot be synchronized with an OLT accurately in the PON. The invention implements the time information synchronization between the ONU and the OLT by using a management path. The time information includes an information transmission delay between the ONU and the OLT and the sending time identifier information of the time information. The invention avoids the technical defect of the unfixed delay for an upper layer protocol data message in a GPON by using the characteristic that a PLOAM message or an OMCI message is not segmented during the transmission thereof in the PON, thus ensuring every ONU can be synchronized with the OLT accurately.

Abstract: The present invention discloses a method for multicast processing, including: when replicating downlink multicast data, an Optical Line Terminal (OLT), on which a same port is connected to different types of Optical Network Units (ONUs), replicates the multicast data to different broadcast or multicast logical channels according to the ONU types of users who join a multicast group. The present invention also discloses a device for multicast processing. The present invention achieves efficient multicast processing when different types of ONUs coexist, therefore preventing excessive data from unnecessarily interfering with the ONUs, meanwhile, efficiently utilizing the bandwidth between an OLT and an ONU, and avoiding the meaningless bandwidth occupation by data streams.

Abstract: A method for implementing the subscriber port positioning by broadband access equipments, includes: when the subscriber initiates an access request, the multi-port terminal equipment captures the access request message, adds the subscriber basic information into the access request message, and transmits it to the office equipment; the single-port terminal equipment forwards the access request message to the office equipment directly; the office equipment captures the access request message, adds the terminal basic information into the access request message and forwards it to the broadband access server; for the multi-port terminal equipment, the terminal basic information and the subscriber basic information comprises the subscriber port positioning information; for the single-port terminal equipment, the terminal basic information is taken as the subscriber port positioning information; after the broadband access server receives the access request message, it extracts the subscriber port positioning informa