“UTI”是“Union Internationale des

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“VANS”是“Value Added Network Services”的缩写，意思

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“VCA”是“Voice Connecting Arrangement”的缩写，意思是

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“VERT”是“Vertical (distribution frame)”的缩写，意思

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“VGF”是“Voice Grade Facility”的缩写，意思是“语音等

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“VTAM”是“Virtual Telecommunications Access Method”

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“WAL”是“WATS (Wide Area Telecommunications Service

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“X-OFF”是“Transmitter OFF”的缩写，意思是“发送器关闭

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“X-ON”是“Transmitter ON”的缩写，意思是“发射机上”

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“SS1”是“Signalling System 1 (500/20 Hz tones)”的缩

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