The system uses MT8880 (made by MITEL company) as the decoding chip of DTMF telephone and chip AT89C51 as the microcontroller, so, the circuit is simple and adaptive.
该系统用MI-TEL 公司的DTMF收发器MT8880芯片作为电话双音多频信号的解码核心，用AT89C5 1单片机作主控器，电路简单灵活。
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In April, Matthews lured Donald Smith, the president of Nortel's optical broadband unit, to head Mitel.
FORBES: Celtic charm
Matthews is merging Mitel into March Networks and hopes to take the company public by 2003.
In 1973 he cofounded Mitel, which pioneered electronic switching systems that allowed for operator-free PBXs and touch-tone phone sets.
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