> 2.13 | FAX

> Figure 95: Fax
> There are different ways to use our module to send/ receive fax documents (see Figure 95):

> • | mobile originated fax from the module to fixed line fax,

> • | mobile terminated fax from fixed line fax to the module and

> • | mobile to mobile fax from one module to another.

> To use our module you will need a fax application and you must configure the different fax classes.
> In order to use our module to send/receive fax documents, it is necessary first to install a modem under Windows. During this installation select the „Standard 19200 bps Modem“. With our module you have the following possibility to send/receive fax:

> • | with fax class 1 and software flow control,

> • | with fax class 1 and hardware flow control,

> • | with fax class 2 and software or hardware flow control.

> If you want to send/receive fax with various fax classes (1 or 2) you have to do it on different fax sessions and for each fax class you need a separate modem under Windows/WinFax. For fax class 1 it is also necessary to install and configure two modems: one for the software flow control and another to use the hardware flow control.
> Figure 96: Fax Phases
> A fax connection can be devided into phases A to E.

> • | Phase A comprises the connection setup initiated bhy the dialing (Calling terminal-ATD) and ended by accepting the call (Called terminal- ATA).

> • | After accepting the call Phase B starts. It contains the fax specific parameter negotiation of the sampling and data transmission parameters between the fax devices.

> • | The data transmission takes place in Phase C.

> • | Phase D contains the pagewise acknowledgement, as well as the decision whether to proceed with Phase E or to return to Phase D.

> • | In Phase E the connection is ended.

> Each fax phase can be associated with certain AT commands (see Section 2.13.1.2).
> With the Software Trace Tool Frontline the fax transmissions have been captured and can be found as screenshots in the following chapters.