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sdh光端机的作用
光端机，就是光信号传输的终端设备。由于目前技术的提高，光纤价格的降低使它在各个领域得到很好的应用（主要体现在安防监控），因此各个光端机的厂家就好比是雨后春笋般发展起来。但是这里的厂家大部分技术并不是完全成熟，开发新技术需要耗资和人力、物力等，这就产生厂…
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