This standard is concerned with characteristics of inter-operability affecting Group 3 facsimile equipment operating on voice band analog circuits. This equipment incorporates means for reducing the redundancy in its message information prior to the modulation process and thus achieves a nominal transmission time of one minute for a typical full-page type-script document. Where options are indicated, the identification and choice of these options is to made in the pre-message portion of the control procedures as standardized in EIA/TIA 466.