What types of modems are available, which are supported?
There are several general types of fax modems available, mainly grouped by Class. The modem class describes the way in which the computer talks to the modem via serial communications.These include: • Class 1 (cheaper consumer modems) • Class 2 (Rockwell chipsets and others) • Class 2.0 (US Robotics and others) • CAS • Proprietary For the purpose of this document, the author will generalize between class 2 and class 2.0 for brevity sake. The reader should be aware that there are specific command syntax differences between a class 2 and 2.0 modem. Most software packages support Class 2/2.0. Many consumer products also support Class 1, however it is not recommended for a multi-tasking operating system. Hylafax will support 2 or 2.0 modems. Note on Group 3: Group 3 fax ability refers to the way in which the modem talks to the remote fax machine. Almost all fax machines and fax modems use Group 3, so you do not need to be concerned with compatibility issues of Group 3. To the author’s knowl
