Abstract: A battery charging system includes a master charger that receives a supply voltage, outputs a master charging current based on the supply voltage, and selectively outputs a slave charger control signal. At least one slave charger receives the slave charger control signal from the master charger, receives the supply voltage, and selectively outputs a slave charging current based on the slave charger control signal and the supply voltage.

Abstract: A method and a device of link aggregation and a method and a system for transceiving MAC frames are provided. The method includes: transmitting, by systems at two ends of a link, information of virtual local area networks (VLANs) of a port in a local end system to an opposite end system through message exchange; and determining, by the systems at the two ends of the link, the VLAN of the link respectively according to the received information of the VLAN of the port in the opposite end system and the information of the VLAN of the port in the local end system, and performing link aggregation according to the VLAN of the link. Thus, the networking flexibility is improved, the convenience of network design and network maintenance and management is improved, and the MAC frames having VLAN identifiers can be distributed to the corresponding VLAN links rapidly, accurately, and conveniently.

Abstract: The invention is directed to methods for screening the resistance of CD4+ cells to viral infection, in particular human immunodeficiency virus (HIV) infection.

Abstract: The present invention discloses a method for maintaining quality of service QoS, which includes: identifying a CLP and a service type of a newly received ATM cell, and obtaining a corresponding QoS label; when the QoS label corresponding to the newly received ATM cell is different from a QoS label corresponding to a buffered ATM cell, encapsulating the buffered ATM cell into a pseudo wire PW packet in a concatenation manner and sending the pseudo wire PW packet, where the QoS label corresponding to the buffered ATM cell is used as a QoS label of a PSN transport header of the PW packet, or is used as QoS labels of both the PSN transport header and a PW header of the PW packet, and buffering the newly received ATM cell. The present invention further provides a corresponding provider edge PE device and a corresponding ATM PWE3 system.

Abstract: The present invention discloses a method for maintaining quality of service QoS, which includes: identifying a CLP and a service type of a newly received ATM cell, and obtaining a corresponding QoS label; when the QoS label corresponding to the newly received ATM cell is different from a QoS label corresponding to a buffered ATM cell, encapsulating the buffered ATM cell into a pseudo wire PW packet in a concatenation manner and sending the pseudo wire PW packet, where the QoS label corresponding to the buffered ATM cell is used as a QoS label of a PSN transport header of the PW packet, or is used as QoS labels of both the PSN transport header and a PW header of the PW packet, and buffering the newly received ATM cell. The present invention further provides a corresponding provider edge PE device and a corresponding ATM PWE3 system.

Abstract: A buck voltage converter comprises an upper switching transistor connected between an input voltage node and a phase node. The upper switching transistor turns on and off responsive to a first drive signal. A lower switching transistor is connected between the phase node and ground. The lower switching transistor turns on and off responsive to a second drive signal. An inductor is connected the phase node and an output voltage node. Control circuitry generates the first drive signal and the second drive signal responsive to a feedback voltage monitored at the output voltage node and a phase at the phase node.

Abstract: The present invention discloses a method for implementing multicast services, which includes: preset a mapping relation between a multicast user address and a multicast group address; acquire a request packet sent by the multicast user who requests to join in the multicast group; determine whether the multicast group address in request packet is the same as that corresponding to the multicast user in the established mapping relation according to the multicast user address and multicast group address carried in the request packet. If yes, allow the multicast user to join in the multicast group. Otherwise, prohibit the multicast user from joining in the multicast group. The present invention can open the preset multicast resources to the preset multicast user with speed and pertinence. At the same time, it limits the maximum number of multicast groups that each multicast user is allowed to join in, which can effectively control multicast service bandwidth and further protect the network equipment.

Abstract: A method and a device of link aggregation and a method and a system for transceiving MAC frames are provided. The method includes: transmitting, by systems at two ends of a link, information of virtual local area networks (VLANs) of a port in a local end system to an opposite end system through message exchange; and determining, by the systems at the two ends of the link, the VLAN of the link respectively according to the received information of the VLAN of the port in the opposite end system and the information of the VLAN of the port in the local end system, and performing link aggregation according to the VLAN of the link. Thus, the networking flexibility is improved, the convenience of network design and network maintenance and management is improved, and the MAC frames having VLAN identifiers can be distributed to the corresponding VLAN links rapidly, accurately, and conveniently.

Abstract: The present invention discloses a method for implementing multicast services, which includes: preset a mapping relation between a multicast user address and a multicast group address; acquire a request packet sent by the multicast user who requests to join in the multicast group; determine whether the multicast group address in request packet is the same as that corresponding to the multicast user in the established mapping relation according to the multicast user address and multicast group address carried in the request packet. If yes, allow the multicast user to join in the multicast group. Otherwise, reject the multicast user from joining in the multicast group. The present invention can open the preset multicast resources to the preset multicast user with speed and pertinence. At the same time, it limits the maximum number of multicast groups that each multicast user is allowed to join in, which can effectively control multicast service bandwidth and further protect the network equipment.