Abstract: The present invention discloses a method and Ethernet device for clock synchronization, a method for clock synchronization in an entire Ethernet, and the relevant Ethernet. The method for clock synchronization in an Ethernet device includes: the PHY layer unit of the Ethernet device extracts a clock from the data sent by the receive unit; the MAC layer unit makes adjustments to the extracted clock according to the local clock and takes the adjusted clock as the transmit clock of the Ethernet device. The method for clock synchronization in an entire Ethernet includes: clocks of all Ethernet devices are synchronized to the clock generated by the Ethernet device at the highest level. The invention provides a method for clock synchronization so that sending and receiving of clocks in Ethernet devices can be synchronized and clock synchronization can be realized in the entire Ethernet.

Abstract: A system for implementing service switching includes a primary service processing unit, a physical interface card, a control center, a switching unit and a standby service processing unit, to guarantee that the physical interface card connected to the failed primary service processing unit transmits the service data that should be processed by the primary service processing unit to the standby service processing unit, and to control the control switching unit to transmit the service data that should be transmitted to the primary service processing unit to the standby service processing unit. A method for implementing service switching includes: managing the physical interface card to transmit the service data that should be processed by the primary service processing unit to the standby service processing unit, and managing the switching unit to transmit the service data that should be transmitted to the primary service processing unit to the standby service processing unit.

Abstract: This invention discloses a method for smooth capacity expansion of data communication product, and a smooth capacity expandable system of data communication. Architecture of the system at least comprises circuit card and switched network card; and further comprises interface card of switched network, interface transfer card and connection optical fiber. Based on these, it provides one kind of multiple frameworks structure with interconnection between frameworks. When the capacity is expanded, the original circuit cards and switched network cards keep unchanged, only smoothly increases the switched network cards and numbers of circuit card frameworks. Therefore, it implements smooth capacity expansion and client investment protection at the same time. With adding backup cards, it also implements capacity expansion without interrupting the service.

Abstract: The present invention discloses a method and Ethernet device for clock synchronization, a method for clock synchronization in an entire Ethernet, and the relevant Ethernet. The method for clock synchronization in an Ethernet device includes: the PHY layer unit of the Ethernet device extracts a clock from the data sent by the receive unit; the MAC layer unit makes adjustments to the extracted clock according to the local clock and takes the adjusted clock as the transmit clock of the Ethernet device. The method for clock synchronization in an entire Ethernet includes: clocks of all Ethernet devices are synchronized to the clock generated by the Ethernet device at the highest level. The invention provides a method for clock synchronization so that sending and receiving of clocks in Ethernet devices can be synchronized and clock synchronization can be realized in the entire Ethernet.

Abstract: This invention discloses a method for smooth capacity expansion of data communication product, and a smooth capacity expandable system of data communication. Architecture of the system at least comprises circuit card and switched network card; and further comprises interface card of switched network, interface transfer card and connection optical fiber. Based on these, it provides one kind of multiple frameworks structure with interconnection between frameworks. When the capacity is expanded, the original circuit cards and switched network cards keep unchanged, only smoothly increases the switched network cards and numbers of circuit card frameworks. Therefore, it implements smooth capacity expansion and client investment protection at the same time. With adding backup cards, it also implements capacity expansion without interrupting the service.

Abstract: A system for implementing service switching includes a primary service processing unit, a physical interface card, a control center, a switching unit and a standby service processing unit, to guarantee that the physical interface card connected to the failed primary service processing unit transmits the service data that should be processed by the primary service processing unit to the standby service processing unit, and to control the control switching unit to transmit the service data that should be transmitted to the primary service processing unit to the standby service processing unit. A method for implementing service switching includes: managing the physical interface card to transmit the service data that should be processed by the primary service processing unit to the standby service processing unit, and managing the switching unit to transmit the service data that should be transmitted to the primary service processing unit to the standby service processing unit.

Abstract: This invention discloses a method for smooth capacity expansion of data communication product, and a smooth capacity expandable system of data communication. Architecture of the system at least comprises circuit card and switched network card; and further comprises interface card of switched network, interface transfer card and connection optical fiber. Based on these, it provides one kind of multiple frameworks structure with interconnection between frameworks. When the capacity is expanded, the original circuit cards and switched network cards keep unchanged, only smoothly increases the switched network cards and numbers of circuit card frameworks. Therefore, it implements smooth capacity expansion and client investment protection at the same time. With adding backup cards, it also implements capacity expansion without interrupting the service.