Editing Fax (section)

==== Analog ====
Group 1 and 2 faxes are sent in the same manner as a frame of [[analog television]], with each scanned line transmitted as a continuous analog signal. Horizontal resolution depended upon the quality of the scanner, transmission line, and the printer. Analog fax machines are obsolete and no longer manufactured.  ITU-T Recommendations T.2 and T.3 were withdrawn as obsolete in July 1996.

* Group 1 faxes conform to the ITU-T Recommendation T.2. Group 1 faxes take six minutes to transmit a single page, with a vertical resolution of 96 [[scan line]]s per inch. Group 1 fax machines are obsolete and no longer manufactured.
* Group 2 faxes conform to the ITU-T Recommendations T.3 and T.30. Group 2 faxes take three minutes to transmit a single page, with a vertical resolution of 96 scan lines per inch. Group 2 fax machines are almost obsolete, and are no longer manufactured.  Group 2 fax machines can interoperate with Group 3 fax machines.