The standard connector for both outputs and inputs shall be the circular latching three-pin connector described
in IEC 60268-12 (this type of connector is normally called «XLR»).
An output connector fixed on an item of equipment shall use male pins with a female shell. The corresponding
cable connector shall thus have female pins with a male shell.
An input connector fixed on an item of equipment shall use female pins with a male shell and the
corresponding cable connector shall thus have male pins with a female shell. The pin usage shall be:
Pin 1: Cable shield or signal earth,
Pin 2: Signal
Pin 3: Signal
(Note that the relative polarity of pins 2 and 3 is not important in the digital case).
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Цифровой аудиоинтерфейс EBU/AES Спецификация