The Remote DOCSIS Timing Interface (RDTI) is the timing specification standardized recently for R-PHY architecture. R-DTI leverages on IEEE1588v2 with a special profile for DOCSIS applications. This paper explains how R-DTI works and what are the requirements on the time/frequency synchronization between CCAP core and RPD to ensure proper DOCSIS operations. Two operation modes that are defined in RDTI, the Node_Slave mode and Node_Master mode, are explained and their operations are illustrated. Tests are done in Cisco R-PHY Lab to validate R-DTI under various network conditions. Test results show that, with the commercial R-DTI solutions, the timing and frequency synchronization between CCAP core and RPD can be achieved within 5 minutes in all the test cases and CM can operate normally without any performance degradation after the synchronization is achieved.
展开▼
