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贝尔系统的第一个标准光波系统已研制好,并且很快就可以普遍地向诸经营电话公司供货。由西电公司制造的FT3是一种打算主要用于都市干线的44.7Mb/s(DS3)数字光波传输系统。
Bell Systems first standard lightwave system has been developed, and will soon be widely available to the operating telephone company. The FT3, manufactured by Western Electric, is a 44.7Mb / s (DS3) digital lightwave transmission intended primarily for urban arterials.