For the last 25 years, my main technical focus has been RF semiconductors for mobile phones. In the mid-1990s, we were concerned with only four frequency bands. We referred to these as cellular, GSM, DCS, and PCS (or, alternatively, as the 850-, 900-, 1,800-, and 1,900-MHz bands). These names were a useful shorthand for specific frequency allocat ions. The numerical names seem more meaningful, but even they are not precise. The 850-MHz band doesn’t even include 850 MHz.

中文翻译：

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名字里有什么？ [微商]


在过去 25 年里，我的主要技术重点是手机射频半导体。在 20 世纪 90 年代中期，我们只关注四个频段。我们将这些称为蜂窝、GSM、DCS 和 PCS（或者称为 850、900、1,800 和 1,900 MHz 频段）。这些名称是特定频率分配的有用简写。数字名称似乎更有意义，但即使它们也不精确。 850 MHz 频段甚至不包括 850 MHz。