电子类短文，寻求翻译：
C/A Definition
The carrier-to-adjacent ratio is defined as the signal-strength ratio between a serving carrier and an adjacent carrier. It is calculated according to the following formula:
C/A (dB) = Serving signal strength (dBm) – Adjacent signal strength (dBm)
The adjacent carrier could be located on both sides of the serving carrier and at a different index. The index represents the number of ARFCN offset from a carrier, which means that the index corresponds to a frequency offset of index multiplied by 200kHz (200kHz is the carrier spacing in GSM). For example, if the serving carrier ARFCN is 20 and the adjacent ARFCN is 19, the corresponding C/A value is called C/A-1, located 200kHz below the serving carrier.
参考答案:三/定义承运人对毗邻比率定义为信号强度比例现任承运人与隔邻的载体. 这是根据下列公式计算: 三/一球(分贝)=在职人数(小菜蛾)三邻邻信号强度(小菜蛾)承运人可以设两旁的载体和服务于不同的指标. 鸥 该指数代表了若干arfcn抵消从承运人 这意味着该指数相当于一个频偏指标乘以电磁(电磁载波间距是在GSM). 举例来说,如果是20arfcn母职,相邻arfcn是19、 相应三/价值叫做c/a-1位于电磁低于母职.