6 – 16
Chapter 6 Principle of Operation (Fax)
Version 1 2006.11.21
Printer
The printer prints image data from the control circuit onto the surface of paper. The principle is the
same as that of an ordinary printer in that black is applied to specified locations on the paper.
6. 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 currently in
greatest use. FAXes conforming to Super G3, a recently added standard, are equipped with a fast
33.6kps modem and reduce transmission times to about half those of G3 FAXes.
Standard
Year Issued
Minimum
Transmission
Time for Single-
Page A4
Document
Maximum
Resolution
Maximum
Transmission
Speed
Features
Group 1 (G1)
1968
Approx. 6 min.
100 x 100dpi
-
(Analog)
First standard.
Analog transmission.
No band compression
technology
Group 2 (G2)
1976
Approx. 3 min.
100 x 100dpi
-
(Analog)
Analog transmission.
Band compression
technology adopted.
Group 3 (G3)
1980
Approx. 1 min.
200 x 200dpi
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)
1988
Approx. 3 sec.
400 x 400dpi
64kbps
(Using ISDN)
Digital transmission.
Supported by various
digital transmission
services.
Halftone supported.
Summary of Contents for 3115CN
Page 1: ...Dell 3115cn Service Manual 23 Mar 2009 ...
Page 11: ...viii Version 2 2007 03 20 4 6 2 Caution label for toner cartridges Gnb00005KA ...
Page 12: ...ix Version 1 2006 11 21 Kmy00006A ...
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Page 14: ...xi Version 1 2006 11 21 4 6 4 Caution label for Print HEAD Gnb00009KA ...
Page 15: ...xii Version 1 2006 11 21 4 6 5 Caution label for Transfer Belt Kmy00007A ...
Page 16: ...xiii Version 1 2006 11 21 4 6 6 Caution label for Duplex Kmy00011GA ...
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Page 656: ...5 9 Chapter 5 Parts List Version 1 2006 11 21 Blank Page ...
Page 703: ...5 56 Chapter 5 Parts List Version 3 2009 03 23 PL13 4 Electrical With IIT 1 2 Illustration ...
Page 725: ...6 12 Chapter 6 Principle of Operation Fax Version 1 2006 11 21 Blank Page ...
Page 750: ...Chapter 7 Wiring Diagrams and Signal Information Version 1 2006 11 21 Blank Page ...
Page 757: ...7 7 Chapter 7 Wiring Diagrams and Signal Information Version 1 2006 11 21 Blank Page ...