| 摘要 |
PURPOSE: An apparatus for interfacing a data clock and a frame synchronous pulse in a local data link circuit pack within a mobile communication exchange is provided to interface the data clock and the frame synchronous pulse between an even link and an odd link by installing a clock selector and a frame synchronizer within a control portion. CONSTITUTION: An odd optical interface portion(110) is used for transmitting and receiving optical data of an STM-1 level of 155.520Mbps. An even optical interface portion(120) is used for transmitting and receiving optical data of an STM-1 level of 155.520Mbps. A PCM/IPC data transmission/reception memory portion(130) is used for transmitting and receiving PCM/IPC data between the odd and the even interface portions(110,120) and a time switch(200). A phase locked loop(140) generates a clock of 16.38Mhz synchronized with a clock of 19.44Mhz extracted from the even optical interface portion(120). A control portion(150) generates a data clock and control a data transmission operation and a data reception operation. A data clock/frame synchronization interface portion(170) is used for interfacing the data clock and a frame synchronous signal between the control portion(150) and other side boards. A data interface portion(180) transmits the data clock and the frame synchronous signal to the time switch(200).
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