Patent ID: 8538256
Filing Date: 2013-09-17
Classification: H04B,H04J,H04Q

Abstract:
1. Method for protecting an optical network system comprising a first and at least a second optical network device, an optical distribution network, and a first and second optical line termination device, the first optical network device communicating with the first optical line termination device on a first connection via the optical distribution network and a first optical fiber trunk connected to the first optical line termination device, and the first optical network device having a second connection to the second optical line termination device via the optical distribution network and a second optical fiber trunk connected to the second optical line termination device, wherein the method comprises the steps of: detecting that the communication from the first optical network device is lost; initiating switching of functionality from the first optical line termination device to the second optical line termination device; sending a control message from the second optical line termination device to the first and second optical network devices such that the first and second optical network devices are prevented from moving into initial state; determining and setting timing settings for the first and at least said second optical network devices based on only one roundtrip delay measurement, and, broadcasting the timing settings to the first and at least said second optical network devices: