COMMUNICATION SYSTEM, COMMUNICATION DEVICE AND TIME INFORMATION CORRECTION METHOD

摘要

The objective of the present invention is to achieve a communication system, communication device, and time information correction method which, in a communication system in which a plurality of communication devices are connected, is capable of operating using more accurate time information even in a case in which a cyclic signal to be a reference from the outside is not received. The communication system as laid out in the invention is a communication system in which an Optical Line Terminal (1) and a plurality of Optical Network Units (2) are connected via an optical transport line. The Optical Line Terminal (1) is provided with control signal transmission means (15) which generates a control signal that includes a reference time and a reference clock, and which transmits the control signal to the Optical Network Units (2). The Optical Network Units (2) are provided with clock comparison means (25) which compares an operating clock of the Optical Line Terminal (1) with an operating clock generated within the device itself and retains the comparison result, and time correction means (25) which corrects the reference time on the basis of the comparison results and an internal clock generated within the device itself.