55results about How to "Fast protection switching" patented technology

A symmetrical capacity network may be adapted to accommodate asymmetrical network traffic patterns by deploying Protected Dedicated Wavelengths (PDWs) between one or more head-end nodes and the access nodes on a ring-based topology network. The PDWs include pairs of wavelengths extending in opposite directions around the fibers forming the original ring and terminating at the intended access node. The pairs of wavelengths form unidirectional working and protection paths from the head-end node to the intended access nodes. By deploying the symmetric capacity and asymmetric capacity on the same platform within the head-end node, it is possible to apply policy across the network resources to allow traffic flows to be selectively placed on the most appropriate network resource.

A symmetrical capacity network may be adapted to accommodate asymmetrical network traffic patterns by deploying Protected Dedicated Wavelengths (PDWs) between one or more head-end nodes and the access nodes on a ring-based topology network. The PDWs include pairs of wavelengths extending in opposite directions around the fibers forming the original ring and terminating at the intended access node. The pairs of wavelengths form unidirectional working and protection paths from the head-end node to the intended access nodes. By deploying the symmetric capacity and asymmetric capacity on the same platform within the head-end node, it is possible to apply policy across the network resources to allow traffic flows to be selectively placed on the most appropriate network resource.

A method and a system for forwarding Ethernet packets by an Ethernet bridge (EB1) in an Ethernet Layer 2 VPN network; said method being characterized in that it comprises the steps of: by the L2VPN module (Vx1) of the ingress LER (ML1), notifying the first Ethernet bridge (EB1) about the primary internal port (4) associated to the receiving MAC-address (MACb) and to the given VLAN identification; by the L2VPN module (Vx1) of the ingress LER (ML1), notifying the first Ethernet bridge (EB1) about the backup internal port (5) directly associated to the backup MPLS port (5m) which is acting as a backup MPLS port in an event of failure of the primary MPLS port (4m); by the first Ethernet bridge (EB1), adding to the internal filtering database the backup internal port (5) to be used in the event of failure of the primary MPLS port (4m) so as to create a combined filtering database; by the ingress MPLS LER (ML1), notifying the first Ethernet bridge (EB1) about MPLS ports status; by the at least one transmitting CE device (CEa), transmitting Ethernet packets of a given VLAN identification to the receiving MAC-address (MACb) of the at least one receiving CE device (CEb); by the first Ethernet bridge (EB1), before forwarding the transmitted Ethernet packets, checking, when, in the combined filtering database, the receiving MAC-address (MACb) of the given VLAN is associated to a backup ingress internal port (5), if the corresponding primary MPLS port (4m) directly associated to said primary ingress internal port (4) is failed or not; if the corresponding primary MPLS port (4m) is failed, forwarding Ethernet packets to the backup egress port (5) of the receiving MAC-address (MACb) having the given VLAN identification.

The invention discloses a system and a method for realizing OLT (Optical Line Terminal) voice double upper-link protection based on OSPF (Open Shortest Path First Interior Gateway Protocol) routing protocol, and relates to the field of PON (Passive Optical Network). A CPU of an OLT master control panel in the system comprises an OSPF module and an RTM (Running Timer Meter) module. Two upper-link ports of an OLT are respectively connected with a NGN (Next Generation Network) through three-layer exchangers A and B to connect with a remote-end MGC (Media Gateway Controller) server; paths A and B are formed between the OLT and the MGC server; the OLT and the three-layer exchangers A and B are respectively configured with the OSPF protocols and operate; the OLT learns the routes of all network sections on the paths A and B through the OSPF route protocol; the OSPF module stores the learnt routes in the route table of the OSPF module and announces the learnt routes to the RTM module; and the RTM modules collects the route items and writes the route items in an RIB table. When a main link breaks, the OSPF route protocol learns the route of a backup link and carries out rapid protective rearrangement to the high real-time voice business among internetworking nodes.

The invention relates to a low-expense high-survivability PON protection structure, and belongs to the technical field of optical networks. A plurality of different functional units of logic decision, backup transmitting-receiving, protection path control, and the like are additionally arranged in an optical line terminal; the switching of an optical switch is confirmed by the logic decision unit according to received logic signals; protection wavelength of a faulty component is tuned by the backup transmit-receive unit to enable a WDM part to conduct switching operation just on the faulty component to realize low expense concentrated protection; a cross concentration line structure is adopted at a TDM part; quick distributed protection switching is realized when ONU detects fault. According to the invention, the number of components participating in the protection switching in the WDM / TDM-PON system is effectively decreased; influence range of the fault is reduced; protection resource expense on the fault is reduced; full protection to all optical fiber fault in the whole system is realized.

A method and an apparatus for realizing communication between single boards are provided by this invention. The method includes the steps: a sending single board adds a priority processing sign into a message encapsulated with emergency information when the message is being constructed, and preferentially sends the message via a management channel to a receiving single board according to the priority processing sign. After receiving the message, the receiving single board preferentially resolves the message encapsulated with the emergency information according to the priority processing sign. Wherein, the sending single board or the receiving single board is a main control board. By means of a soft HW channel established between the main control board and the service board and the chips stacking of the main control board, the present invention simplifies equipment, efficiently transmits information, saves the circuit at the back board, realizes quick protection switching, and achieves quick information transmission and protection switching on both links between the main control boards and between the main control board and the service board, thus improving the data communication capability and the protection ability of the system with the simple system structure.