Phaser 6500/WorkCentre 6505 Service Manual
Xerox Internal Use Only
2-73
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.
Содержание Phaser 6500
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Страница 374: ...4 82 Xerox Internal Use Only Phaser 6500 WorkCentre 6505 Service Manual General Troubleshooting http www manuals4you com...
Страница 443: ...7 Chapter Cleaning and Maintenance In this chapter Service Maintenance Procedure Cleaning Maintenance Moving the Printer...
Страница 569: ...Phaser 6500 WorkCentre 6505 Service Manual Xerox Internal Use Only 8 121 Service Parts Disassembly s6500 305...
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