Xerox Phaser 6180MFP Service Manual

Also see for Phaser 6180MFP: Brochure & specs User guide Features setup guide Supplementary guide Supplementary guide

Contents

Xerox Phaser 6180MFP Service Manual Manual pdf 187 page image

Phaser 6180MFP Multifunction Printer Service Manual 2-105Theory of OperationFax Standards (ITU-T Recommendations)International Fax Standards (ITU-T Recommendations) include G1 to G4. G1to G3 use analog telephone networks. G4 uses a digital telephone network(ISDN). G3 is the standard that is currently in use. Faxes conforming to SuperG3, a recent added standard, are equipped with a fast 33.6kps modem andreduce transmission times to about half those of G3 Faxes.Fax StandardsStandardYearIssuedMinimumTransmissionTime forSingle-Page A4DocumentMaximumResolutionMaximumTransmissionSpeed FeaturesGroup 1(G1)1968 Approx. 6 min. 100 x 100 dpi (Analog) First standard.Analog transmission.No band compressiontechnology.Group 2(G2)1976 Approx. 3 min. 100 x 100 dpi (Analog) Analog transmission.Band compression technologyadopted.Group 3(G3)1980 Approx. 1 min. 200 x 200 dpi 14.4kbps(Super G3:33.6kbps)Connection to analog line usingFax modem.Image data in digital format.Data compression.Most common standard in use.Group 4(G4)1988 Approx. 3 sec. 400 x 400 dpi 64kbps(using ISDN)Digital transmission.Supported by various digitaltransmission services.Halftone supported.