| 摘要 |
PURPOSE: A DSLAM multi-input synchronizing duplexer and a method of it are provided to replace one board with another board when the board is replaced or when the input signal is failed by recovering external synchronizing clocks given from the existing network and clocks such as STM1, DS3, E1, T1, etc to keep a phase synchronization of the overall system, and duplexing the board. CONSTITUTION: ADPB boards(10,20) transmit sending/receiving signals. CSUB synchronous-part boards(30,40) maintain a phase synchronization by using an external synchronizing signal or receiving a loop synchronizing signal when the external synchronizing signal does not exist, and are also duplexed to allow a slave board to be a master board when the master board does not work well. A CSDB synchronous-part board(50) is input a synchronization and output signals such as E1, STM1 UNI, DS3 UNI, T1 UNI, etc, via a PLL-part. A synchronous line(60) is connected between the CSDB synchronous-part board(50) and the CSUB synchronous-part boards(30, 40) to forward E1_ext, a duplexing signal, a board type, and a synchronous signal, etc. The CSDB synchronous-part board(50) also consists of a synchronous input-part(51) which is input a synchronization through the synchronous line, a PLL-part(52) which is a phase locked loop and an E1 UNI(53).
|
