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Phaser 6128MFP Service Manual
2-65
Theory of Operation
Fax Standards (ITU-T Recommendations)
International Fax Standards (ITU-T Recommendations) include G1 to G4. G1 to G3
use analog telephone networks. G4 uses a digital telephone network (ISDN). G3 is
the standard that is currently in use. Faxes conforming to Super G3, a recent added
standard, are equipped with a fast 33.6kps modem and reduce transmission times
to about half those of G3 Faxes.
Fax Standards
Standard
Minimum
Transmission
Time for
Single-Page
A4 Document
Maximum
Resolution
Maximum
Transmission
Speed
Features
Group 1
(G1)
Approx. 6 min.
100 x 100 dpi
(Analog)
Analog
transmission.
No band
compression.
Group 2
(G2)
Approx. 3 min.
100 x 100 dpi
(Analog)
Analog
transmission.
Band compression
technology
adopted.
Group 3
(G3)
Approx. 1 min.
200 x 200 dpi
14.4kbps
(Super G3:
33.6kbps)
Connection to
analog line using
Fax modem.
Image data in
digital format.
Data compression.
Most common
standard in use.
Group 4
(G4)
Approx. 3 sec.
400 x 400 dpi
64kbps
(using ISDN)
Digital
transmission.
Supported by
various digital
transmission
services.
Halftone
supported.
Summary of Contents for Phaser 6128 MFP
Page 1: ...Phaser 6128MFP Multi Function Printer Phaser 6128MFP Service Manual ...
Page 2: ......
Page 14: ...xii Phaser 6128MFP Service Manual Contents ...
Page 24: ...xxii Phaser 6128MFP Service Manual ...
Page 54: ...1 30 Phaser 6128MFP Service Manual General Information ...
Page 120: ...2 66 Phaser 6128MFP Service Manual Theory of Operation ...
Page 270: ...3 150 Phaser 6128MFP Service Manual Error Messages and Codes ...
Page 408: ...5 62 Phaser 6128MFP Service Manual Print Quality Troubleshooting ...
Page 420: ...6 12 Phaser 6128MFP Service Manual Adjustments and Calibrations ...
Page 424: ...7 4 Phaser 6128MFP Service Manual Cleaning and Maintenance ...
Page 604: ...I 6 Phaser 6128MFP Service Manual ...
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