Patent ID: 8964790
Filing Date: 2015-02-24
Classification: H04J

Abstract:
1. A communication apparatus for performing time synchronization between a local apparatus and other apparatuses by transmitting/receiving a packet for time synchronization, comprising: a first real-time clock to generate the packet for time synchronization; a second real-time clock, time-synchronized with the first real-time clock, to obtain a transmission time of the packet for time synchronization; an interface unit to externally transmit or receive a signal, and a monitor control unit to control the interface unit are provided in the communication apparatus, wherein the first real-time clock and the second real-time clock are provided in the interface unit; and a circuit to select a Pulse Per Second (PPS) signal within the interface unit or a PPS signal fed from the monitor control unit is provided, wherein the time synchronization between the apparatuses is performed according to a Precision Time Protocol (PTP), and the time synchronization between the first real-time clock and the second real-time clock is realized by a hardware operation with the use of a PPS signal and a system clock.