How To Fix A Paper Jam On Brother 575 Fax Machine

A modern fax machine does not have the rotating drums and is a lot faster, simply it uses the aforementioned basic mechanics to go the job done:

At the sending end, there is some sort of sensor to read the newspaper. Usually, a modernistic fax machine also has a paper-feed mechanism so that it is piece of cake to send multi-page faxes.
There is some standard style to encode the white and black spots that the fax machine sees on the paper so that they can travel through a telephone line.
At the receiving end, there is a machinery that marks the newspaper with black dots.

A typical fax machine that yous find in an office is officially known as a CCITT (ITU-T) Group iii Facsimile auto. The Grouping 3 designation tells you lot four things about the fax auto:

The scanning process: The scanner in a fax machine looks at one line of the sheet of paper. The scan line is shown here in red. It sees a group of black and white spots, shown blown up in the red rectangle at the bottom of the figure. It encodes the pattern of spots and sends them through the phone line. — The scanning process: The scanner in a fax machine looks at one line of the sheet of newspaper. The scan line is shown here in ruby. It sees a group of black and white spots, shown diddled up in the red rectangle at the bottom of the figure. Information technology encodes the pattern of spots and sends them through the phone line.

It will be able to communicate with whatever other Group iii machine.
It has a horizontal resolution of 203 pixels per inch (eight pixels/mm).
It has iii different vertical resolutions: Standard: 98 lines per inch (3.85 lines/mm) Fine: 196 lines per inch (vii.7 lines/mm) Super fine (non officially a Group 3 standard, but adequately mutual): 391 lines per inch (15.4 lines/mm)
Information technology can transmit at a maximum data rate of 14,400 $.25 per second (bps), and will usually fall dorsum to 12,000 bps, 9,600 bps, vii,200 bps, 4,800 bps or 2,400 bps if at that place is a lot of noise on the line.

The fax machine typically has a CCD or photo-diode sensing array. It contains one,728 sensors (203 pixels per inch), so it can scan an entire line of the document at one fourth dimension. The newspaper is lit by a small fluorescent tube so that the sensor has a clear view.

The image sensor looks for black or white. Therefore, a single line of the document can exist represented in 1,728 $.25. In standard mode, there are one,145 lines to the document. The total document size is:

1,728 pixels per line * 1,145 lines = approximately 2,000,000 bits of information

To reduce the number of bits that have to be transmitted, Grouping three fax machines use three unlike compression techniques:

Modified Huffman (MH)
Modified Read (MR)
Modified Modified Read (MMR)

See Electronics Plus: Facsimile Theory for a discussion of these pinch types. The bones idea in these schemes is to await for "runs" of same-colour $.25. For example, if a line on the page is all white, the modem can transmit a dozen or so bits rather than the full i,728 $.25 scanned for the line. This sort of pinch can cutting transmission time by a factor of at to the lowest degree two, and for many documents much more. A document containing a significant amount of white space tin transmit in just a few seconds.

On the side by side page, we'll talk about receiving faxes.