Acoustic coupler

The acoustic coupler is a variant of the modem are sent to the data through a telephone line. In contrast to the acoustic modem has no direct electrical connection to the telephone network, but this requires a telephone. At the microphone and speaker of the telephone receiver, the corresponding counterparts of the acoustic coupler to be attached. The selection was carried out at the old models of the selection device ( rotary dial keys) the phone, newer models (for example, Road Warrior Telecoupler II) dominate the multi-frequency dialing and can therefore be used directly by the Wählsoftware the operating system.

There are two types of acoustic couplers:

• Acoustic couplers that are connected directly to the serial port of the computer ( for example Dataphon s21d ). Commissioning is very complex, because the application software must be configured with these models usually also must be the choice of the number by hand.
• Acoustic couplers that are connected directly to a modem and are only the hardware interface to the telephone network. They dominate the tone dialing, so the usual Wählsoftware the operating system can still be used.

Due to their design acoustic are sensitive to external noise. Therefore, the data transfer rates of old acoustic only range from 300 up to 2400 bit / s Later models, for example Konexx Coupler, Road Warrior Telecoupler II, achieve in practice data transfer rates up to 33,600 bit / s, so that, for example, the collection of e- mails from a cell phone in a reasonable time possible.

Others

Acoustic couplers are sometimes referred to in the German language as Datenfön, after the once popular Dataphon series S21, the company Woerltronic from Cadolzburg.

Published in 1985 the Chaos Computer Club in the hacker bible building instructions for a DIY acoustic coupler, the so-called " Datenklo ".