What does ext interface mean?

ext interface is the external telephone line port. There are two telephone line interfaces at the back of the fax machine. One is the LINE interface, which is used to receive incoming calls; the other is the EXT interface, from which you can use another telephone line to receive an extension call.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

There are two telephone line interfaces on the back of the fax machine. One is the LINE port, which is used to receive incoming calls. The other port is the EXT port, which is an external telephone line port. You can use another phone line to connect an extension call from this port.

If the two ports are connected incorrectly, the fax function will not be available.

Extended information:

Fax technology was born as early as the 1840s, thirty years before the invention of the telephone Year. It was invented in 1843 by a British inventor named Alexander Bain.

However, fax communication is a technology that developed relatively slowly in the field of telecommunications. It did not gradually mature until the 1920s, and developed rapidly after the 1960s. In the past decade, it has become one of the most widely used communication tools.

Common fax machines on the market can be divided into four categories:

1. Thermal paper fax machine (also known as roll paper fax machine);

2 , Laser plain paper fax machine (also called laser all-in-one machine);

3. Inkjet plain paper fax machine (also called inkjet all-in-one machine);

4. Thermal Transfer type plain paper fax machine.

The working principle of a fax machine is very simple, that is, it first scans the document to be sent and converts it into a series of black and white dot information. This information is then converted into an audio signal and transmitted through a traditional telephone line. After the recipient's fax machine "hears" the signal, it will print out the corresponding point information, so that the recipient will receive a copy of the original sent document.

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