Abstract: A system and a method for transmitting network packets are provided. The system includes an information module, a scheduling module, and a forwarding module. The information module receives and records media information of a plurality of multimedia streams. The scheduling module calculates a guaranteed bit rate of each multimedia stream according to the media information provided by the information module, and rearranges isochronous packets of the multimedia streams in the first time slots of a plurality of clock cycles according to the guaranteed bit rates so that the transmission of the isochronous packets satisfies the guaranteed bit rates. The length of each clock cycle is a predetermined length. The length of the first time slot and the predetermined length are in a predetermined ratio. The forwarding module transmits all the packets of a clock cycle to a network at every a time interval of the predetermined length.

Abstract: A method and an apparatus for encrypting/decrypting packet data of a precise time synchronization protocol and a time synchronization system are illustrated. The method is suitable for the time synchronization system using a precise time protocol. The time synchronization system includes a master node and a slave node, wherein the slave node synchronizes its time with the master node. In the method for encrypting/decrypting packet data of the precise time synchronization protocol, an encryption/decryption hardware device is disposed on the hardware protocol layer of each of the master node and the slave node. The hardware protocol layer is under the data link layer, and includes the data link layer. A synchronization message is encrypted by using the encryption/decryption hardware devices of the master node to generate a frame data, and the frame data is decrypted by using the encryption/decryption hardware devices of the slave node to obtain the synchronization message.

Abstract: A bandwidth arranging method includes the following steps of: registering isochronous packets of N isochronous streams, N is a natural number greater than 1; segmenting an isochronous transmission period into M sub-periods, M is a natural number greater than 1; arranging operation of transmitting each of the N isochronous streams in one of the M sub-periods and allocating corresponding bandwidth according to bandwidth requirement information corresponding to each of the N isochronous streams; arranging the isochronous packets into M output queues corresponding to the respective M sub-periods; outputting isochronous packets stored in the M output queues in the respective M sub-periods.

Abstract: A system and a method for transmitting network packets are provided. The system includes an information module, a scheduling module, and a forwarding module. The information module receives and records media information of a plurality of multimedia streams. The scheduling module calculates a guaranteed bit rate of each multimedia stream according to the media information provided by the information module, and rearranges isochronous packets of the multimedia streams in the first time slots of a plurality of clock cycles according to the guaranteed bit rates so that the transmission of the isochronous packets satisfies the guaranteed bit rates. The length of each clock cycle is a predetermined length. The length of the first time slot and the predetermined length are in a predetermined ratio. The forwarding module transmits all the packets of a clock cycle to a network at every a time interval of the predetermined length.

Abstract: A method and an apparatus for encrypting/decrypting packet data of a precise time synchronization protocol and a time synchronization system are illustrated. The method is suitable for the time synchronization system using a precise time protocol. The time synchronization system includes a master node and a slave node, wherein the slave node synchronizes its time with the master node. In the method for encrypting/decrypting packet data of the precise time synchronization protocol, an encryption/decryption hardware device is disposed on the hardware protocol layer of each of the master node and the slave node. The hardware protocol layer is under the data link layer, and includes the data link layer. A synchronization message is encrypted by using the encryption/decryption hardware devices of the master node to generate a frame data, and the frame data is decrypted by using the encryption/decryption hardware devices of the slave node to obtain the synchronization message.

Abstract: Disclosed is a rack pair for mounting speakers and system board in a monitor of a computer system being mounted behind a front frame of the monitor at two lower or upper corners thereof so that a distance left between the rack pair is substantially equal to a width of a system board disposed inside the monitor. The rack pair are characterized in that the rack each is formed at an inner side with a longitudinal groove which has a width slightly larger than a thickness of the system board to clamp the system board between the rack pair, that the rack each is provided with a connecting device extending toward a display tube in the monitor to connect a speaker cabinet member, and that a locater is provided at a lower portion of each rack for engaging with a fixing device provided behind the front frame of the monitor so that the rack pair for mounting speakers and system board can be firmly mounted in the monitor for the speakers to be mounted in the monitor together with the system board.