| 摘要 |
PURPOSE:To correctly recover a slow clock at a transmission side by sending phase shifting information from a TDM at a transmission side, and performing the recovery of the slow speed clock while adjusting a frequency division ratio by using the phase shifting information with a TDM at a reception side. CONSTITUTION:At the TDM 18a at the transmission side, a phase shift sending circuit 17 generates the phase shifting information representing phase shift between e phase of the slow speed clock inputted from a slow speed modem and that of a high speed clock, and transmits it to the TDM 20a at the reception side by using a high speed line 40. At the TDM 20a at the reception side, a phase shift reception circuit 23 starts up a frequency divider 21 by releasing the reset of the frequency divider 21 receiving the phase shifting information. A setting circuit 22 recognizes the deviation of a data sampling timing from the phase shifting information receiving first, and varies the frequency division ratio of the frequency divider 21 at appropriate time. |
