Definition: | document facsimile equipment which uses double sideband modulation without any signal bandwidth compression and which is suitable for the transmission of a page of ISO A4 size in about six minutes at nominally four lines per millimetre via a telephone-type circuit
NOTE – Equipment in group 1 may be designed to operate at a lower definition than four lines per millimetre for the transmission of a page of ISO A4 size in a time between three and six minutes.
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