Fax; Fax Overview - Xerox Phaser 6500 Service Manual

Fax

Fax Overview

Phaser 6500/WorkCentre 6505 Service Manual
A Fax is a device that sends and receives image data using either an analog or a
digital telephone line. The WorkCentre 6505 MFP supports Super-G3 analog Fax,
as discussed in this overview.
The three basic units of a Fax are the Scanner (for reading the image), the Control
Circuit, and the Printer.
FAX System (Detail)
Scanner
Scanning
Lamp
CCD
Control Circuit
Modem
DA
A/D Conversion
Conversion
(Modulation)
Control Circuit
Modem
AD
Conversion
A/D Conversion
(Demodulation)
Printer
Printing
Xerox Internal Use Only
Original
Original
Digital Signal
Image
Unit
NCU
Sending FAX
Analog Signal
Telephone Line
Receiving FAX
NCU
Unit
Digital Signal
Print
Theory of Operation
Black becomes 0,
1 white, creating...
1 1 1 1 1 1
1 0 0 0 0 1
1 0 1 1 1 1
1 0 1 1 1 1
1 0 0 0 1 1
1 0 1 1 1 1
1 0 1 1 1 1
1 0 0 0 0 1
1 1 1 1 1 1
Digital data
s6500-088
2-71