Abstract: The present invention discloses a method, a system, and a device for protecting multicast in a communication network. The technical solution of the present invention is: In a communication multicast network, a main node and a backup node serve as root nodes to generate two multicast trees simultaneously; the multicast tree that uses the backup node as a root node is set to be in a silent state; when the network is faulty, and the current main multicast tree is unable to forward multicast packets to all leaf nodes in the multicast tree, the silent state of the backup multicast tree is canceled and the backup multicast tree starts forwarding the multicast packets.

Abstract: A method may include receiving a packet; identifying the packet as a multicast packet for sending to a plurality of destination nodes; selecting a first forwarding table or a second forwarding table for sending the packet to each of the plurality of destination nodes, wherein the first forwarding table includes first port information associated with a first destination and second port information associated with a second destination, and wherein the second forwarding table includes third port information associated with the second destination; sending the packet to the first destination using the first port; and sending the packet to the second destination using the second port when the first forwarding table is selected and sending the packet to the second destination using the third port when the second forwarding table is selected.

Abstract: A method may include receiving a packet; identifying the packet as a multicast packet for sending to a plurality of destination nodes; selecting a first forwarding table or a second forwarding table for sending the packet to each of the plurality of destination nodes, wherein the first forwarding table includes first port information associated with a first destination and second port information associated with a second destination, and wherein the second forwarding table includes third port information associated with the second destination; sending the packet to the first destination using the first port; and sending the packet to the second destination using the second port when the first forwarding table is selected and sending the packet to the second destination using the third port when the second forwarding table is selected.

Abstract: A method for allocating an address in an IP network includes: receiving, by a server, a request message from a client, where the client is connected to the server through at least one routing device, and the request message received by the server carries a device identifier of a preceding stage routing device of the client; obtaining, by the server, according to the device identifier of the preceding stage routing device, a first address prefix pool that is pre-allocated to the preceding stage routing device, and allocating a second address prefix pool to the client according to the first address prefix pool, where an address range corresponding to the second address prefix pool falls within an address range corresponding to the first address prefix pool; and sending, by the server, the second address prefix pool to the client.

Abstract: An analog silicon photomultiplier system includes at least one analog pixel comprising a plurality of analog photodiodes (APDs), and a capacitor, a signal generator, a phase detector, and a compensation network. The signal generator is configured to generate and propagate a sinusoidal signal concurrently along first and second transmission lines. A capacitor is loaded on the first transmission line when an APD corresponding to the capacitor detects a photon. The phase detector is coupled with the first and second transmission lines, determines a phase difference between the first transmission line and the second transmission line and calculates a number of APDs that have fired from the phase difference. The compensation network is coupled with the second transmission line and the phase detector, and comprises a plurality of compensation capacitors, wherein the compensation capacitors are loaded on the second transmission line in proportion to the number of APDs that have fired.

Abstract: The present invention discloses a method for implementing multicast in RSTP (Rapid Spanning Tree Protocol) ring network. In the method, the port mode of a program is configured to a fixed port mode, a root port binding mode or an upper layer querier port following mode; a multicast module on access equipment traverses a program table on receiving a root port switching message, updates the corresponding port of each program whose mode is configured to the root port binding mode as the changed root port; or on receiving an IGMP (Internet Group Management Protocol) QUERY packet from a port which is different from a recorded global querier port, the multicast module updates the global querier port as the port receiving the IGMP QUERY packet, traverses the program table, and updates the corresponding port of each program whose mode is configured to the upper layer querier port following mode as the port receiving the IGMP QUERY packet.

Abstract: A cable connector comprising a connector, a cable, a circuit board electrically connecting the connector to the cable, an insulating inner housing and an outer housing. The connector comprises an insulating housing, a plurality of conductive terminals disposed therein and a metal shield mounted on the periphery of the insulating housing. The insulating inner housing comprises upper and lower casings integrally coupled together and a receiving space formed therebetween for accommodating the circuit board. The cable connector comprises a copper foil which covers the periphery of the insulating inner housing. The copper foil is electrically coupled to the metal shield and grounded through the metal shield. Finally, the outer housing envelopes the periphery of the copper foil. Thereby, the cable connector can achieve both miniaturized and a lower cost, while also reducing the rate of defective products.

Abstract: A surface carburization technique of medical titanium alloy femoral head in total hip arthroplasty comprises subjecting medical titanium alloy TC4 to surface carburization by using acetylene as carburizing agent to carry out gaseous carburization at high temperature to give medical titanium alloy femoral head in total hip arthroplasty with TiC ceramic on surface thereof. The TiC ceramic layer on femoral head can be more than 100 micron thick, which is relatively thick, overcomes the disadvantages in available medical titanium alloy material, and is particularly useful for replacement of total hip or knee arthroplasty.

Abstract: A cable connector comprising a connector, a cable, a circuit board electrically connecting the connector to the cable, an insulating inner housing and an outer housing. The connector comprises an insulating housing, a plurality of conductive terminals disposed therein and a metal shield mounted on the periphery of the insulating housing. The insulating inner housing comprises upper and lower casings integrally coupled together and a receiving space formed therebetween for accommodating the circuit board. The cable connector comprises a copper foil which covers the periphery of the insulating inner housing. The copper foil is electrically coupled to the metal shield and grounded through the metal shield. Finally, the outer housing envelopes the periphery of the copper foil. Thereby, the cable connector can achieve both miniaturized and a lower cost, while also reducing the rate of defective products.

Abstract: A polymer electrolyte comprises a first polymeric matrix, a second polymeric matrix, and a lithium salt. The first polymeric matrix comprises pores. The second polymeric matrix is disposed in at least some of the pores of the first polymeric matrix. The lithium salt is disposed in at least some of the pores of the first polymeric matrix.

Abstract: A cable connector comprises four cables, four SATA socket connectors connected with an end of the four cables respectively, and an IPASS™ connector connected with the other end of the four cables; wherein, the SATA socket connector comprises: an insulating body, the center of the insulating body protruding forwardly to form a L-shaped tongue plate, the periphery of the insulating body further protruding forwardly to form a frame which encloses the tongue plate; and a plurality of conductive terminals, each of the conductive terminals being provided with a butting end at the tongue plate side and a soldering end extending backwardly from the butting end, and the soldering end being electrically connected with one end of the cable. The spatial positions of these four SATA socket connectors of the cable connector can be changed flexibly for adapting to changes in the practical application environment, so as to obtain more flexible and convenient use of the cable connector.

Abstract: A network device may include an input device and a packet forwarding engine. The input device receives a data packet. The packet forwarding engine includes logic configured to determine that the data packet is to be multicast. The logic is also configured to identify one of multiple forwarding schemes, where each of the forwarding schemes is configured such that the packet forwarding engine generates and forwards no more than two copies of the data packet.

Abstract: A network device may include an input device and a packet forwarding engine. The input device receives a data packet. The packet forwarding engine includes logic configured to determine that the data packet is to be multicast. The logic is also configured to identify one of multiple forwarding schemes, where each of the forwarding schemes is configured such that the packet forwarding engine generates and forwards no more than two copies of the data packet.

Abstract: Embodiments of the present invention provide a method and a system for implementing multicast using a slave block in DSL access technique. Several slave blocks are cascaded with a master block accessed to the DSL. The master block and slave block are respectively connected with DSL users via RTUs, and access an uplink via a network interface of the master block. The slave block is configured to support the IGMP proxy or the IGMP snooping so as to implement multicast function independently. This invention overcomes the shortcomings including the heavy burden on the master block, low efficiency and serious waste in bandwidth resulting from the fact that the operation of the slave block multicast member is implemented in the master block, thus increasing the efficiency of multicast and saving bandwidth of the master block.

Abstract: An electrical connector includes an insulating housing having a pair of side-walls, a plurality of terminals retained in the insulating housing and comprising contacting portions and a shielding shell surrounding the housing. Each of the side walls of the housing defines a window portion thereof to communicating with the mating cavity and an exterior. A pair of side walls of the shell covers on the side walls of the insulating housing and each defines a resilient arm extending into the mating cavity through the window portion.

Abstract: An electrical connector includes an insulating housing having a pair of side-walls, a plurality of terminals retained in the insulating housing and comprising contacting portions and a shielding shell surrounding the housing. Each of the side walls of the housing defines a window portion thereof to communicating with the mating cavity and an exterior. A pair of side walls of the shell covers on the side walls of the insulating housing and each defines a resilient arm extending into the mating cavity through the window portion.

Abstract: A multicast service processing method and access equipment are disclosed. The method includes: receiving multicast program request message from terminal device, inquiring about program rating parameters according to said multicast program request message, wherein the program rating parameter includes multicast group IP address and multicast program rated priority, generating multicast program data according to the program rating parameters, sending the multicast program data to the terminal device.

Abstract: An electrical connector includes an insulating housing (1) with at least one terminal (2) mounted therein. The at least one terminal includes a retaining portion (21) received and retained in the insulating housing, a bending portion (23) extending from the retaining portion (21) and a solder portion (24) extending from the bending portion (23). The bending portion (23) and the solder portion (24) expose to an exterior of the housing. The bending portion (23) offsets to the retaining portion and part of a rear end of the retaining portion serves as an operating portion.