| 摘要 |
PURPOSE: A BSC(Base Station Controller) interface in a WTIB(Wireless Terminal Interface Board) of a key phone system is provided to process transceiving data between the WTIB and a BSC by an RS422 signal method, so as to simplify an existing circuit. CONSTITUTION: A BMC(Burst Mode Controller)(21) processes protocols of transceiving data. An EPLD(Electrically Programmable Logic Device)(22) controls timings of transmission data applied from the BMC(21) and analyzes a field strength and RF(Radio Frequency) related data, then applies the field strength and the RF related data to the BMC(21). A filter(24) removes electromagnetic wave noises of the transceiving data. An RS422 driver(23) converts the transmission data into RS422 signals and transmits the transmission data to a BSC(Base Station Controller) through the filter(24). The RS422 driver(23) converts receiving data received through the filter(24) into TTL(Transistor-Transistor Logic) signals, and transmits the field strength and the RF related data among the TTL signals to the EPLD(22). The RS422 driver(23) transmits voice data among the TTL signals to the BMC(21).
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