XFAX 4.3a - User's Guide

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17. Technical specifications

XFAX is fax software for sending Group 3 faxes with the aid of Class 2-compatible fax modems. The maximum speed for sending faxes is 14.400 bps, however 9.600 bps is the most common. This depends on the other fax unit. The speed of computer to modem is 19.200 bps.

17.1 Modem drivers

Class 2 (proposed TIA/EIA 592) and Class 2.0 (TIA/EIA 592)

17.2 File formats

ASCII, HP Laserjet (PCL-4), Modified Huffman. Files are usually stored in Modified Huffman format since this is a very efficient way of compressing this type of data.

17.3 Memory required

This depends to some extent on the operative system, but the whole system occupies between 2 Mb of memory after installation. When using the system the following is added: One fax file with a normal page of data (A4) needs between 20 and 80 kb.

17.4 Tested platforms

AIX 3.2.5
AIX 4.1
AIX 4.2
AIX 4.3
HP-UX 9.x
HP-UX 10.x
HP-UX 11.x
Linux (Redhat)
SCO OpenServer 5
SCO UnixWare 2.1
SCO UnixWare 7
Solaris 2.x (Intel and Sparc)

17.5 Modems tested

The following modems have been tested with XFAX and functioned satisfactorily. However, for the best functioning we recommend the ZyXEL modem that has been shown to be the most stable with respect to fax functionality.

Intertex, various models
Multitech, various models
US Robotics Courier (with Class 2.0)
US Robotics Sportster (with Class 2.0)
ZyXEL U-1496E
ZyXEL Omni 288S

Problems can arise - particularly sensitive is the reception of faxes - if the serial ports which are used are not of good quality. The ports should be equipped with UART 16550 or similar circuits with buffering. Intelligent cards such as DigiBoard are equipped with such circuits.

17.6 Typefaces in XFAX

The following typefaces are built into XFAX with their respective escape sequences:

Courier 10 cpi <ESC>(s0p0b0s0t10H
Line Printer 16.6 cpi <ESC>(s0p0b0s3t16.6H
Helvetica 8 pt <ESC>(s1p0b0s4t8V
Helvetica 10 pt <ESC>(s1p0b0s4t10V
Helvetica 12 pt <ESC>(s1p0b0s4t12V
Helvetica 10 pt, italics <ESC>(s1p0b1s4t10V
Helvetica 12 pt, italics <ESC>(s1p0b1s4t12V
Helvetica 10 pt, bold <ESC>(s1p3b0s4t10V
Helvetica 14 pt, bold <ESC>(s1p3b0s4t12V
Helvetica 14 pt, bold <ESC>(s1p3b0s4t14V
Times Roman 10 pt, italics <ESC>(s1p3b1s4t10V
Times Roman 12 pt, italics <ESC>(s1p3b1s4t12V
Times Roman 10 pt, bold <ESC>(s1p3b0s5t10V
Times Roman 12 pt, bold <ESC>(s1p3b0s5t12V
Times Roman 14 pt, bold <ESC>(s1p3b0s5t14V
Times Roman 8 pt <ESC>(s1p0b0s5t8V
Times Roman 10 pt <ESC>(s1p0b0s5t10V
Times Roman 12 pt <ESC>(s1p0b0s5t12V

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