“EMX”是“Earth and Magneto Signaling”的缩写，意思是“

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“ENFIA”是“Exchange Network Facilities for

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“ETN”是“Electronic Tandem Network”的缩写，意思是“电

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“FCO”是“Foreign Central Office”的缩写，意思是“外事

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“FGA”是“Feature Group A”的缩写，意思是“特征群A”

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“FGD”是“Feature Group D”的缩写，意思是“特征群D”

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“FP”是“Full Period of service”的缩写，意思是“全服务

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“HEHO”是“Head End Hop Off”的缩写，意思是“头端跳动”

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“HIDF”是“Horizontal Intermediate Distributing

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“VIDF”是“Vertical Intermediate Distributing Frame”

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