Xerox Phaser 6180MFP Service Manual

Phaser 6180MFP Multifunction Printer Service Manual 2-105
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
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 100 dpi (Analog) First standard.
Analog transmission.
No band compression
technology.
Group 2
(G2)
1976 Approx. 3 min. 100 x 100 dpi (Analog) Analog transmission.
Band compression technology
adopted.
Group 3
(G3)
1980 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)
1988 Approx. 3 sec. 400 x 400 dpi 64kbps
(using ISDN)
Digital transmission.
Supported by various digital
transmission services.
Halftone supported.

Xerox Phaser 6180MFP Specifications

General

Brand	Xerox
Model	Phaser 6180MFP
Category	All in One Printer
Language	English