Acoustic Coupler

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An early variant of a modem is the acoustic coupler, which transfers digital computer datas over a telephone wire. The acoustic coupler is connected with a computer, e.g. on a RS-232 interface. The connection to the telephone network is directly used with the telephone earphone.

The data transfer rates of classical models (download/upload in baud): 110/110, 300/300, 1200/1200, 2400/2400 (full duplex) and 1200/75.

dataphon s21-23d[edit]

Packing of dataphon s21-23d

Data transfer speed:

  • max. 300 bit/s; V.21 mode
  • max. 1200 bit/s; V.23 mode
  • Full duplex: 300, 600/75, 75/600, 1200/75, 75/1200 Baud
  • Half duplex: 600/600, 1200/1200 Baud

Power:

  • 9 Volt battery or accu
  • External power supply 9-12 Volt, 40-50 mA
  • over a V.24 interface

Switchs and controls:

  • -/300/600/1200 Baud
  • Inductive/acoustic coupler
  • Switch Ans/Orig/Auto
  • LED for answer mode
  • LED READY
  • LED originate mode
  • LED send
  • LED receive

Interface:

  • V.24/RS-232
  • Standard 25-Pin; ISO 2110
  • DBT03 compatible for BTX

Dimensions: 27 × 8,5 × 5 cm (L × B × H)

Weight: ca. 400 g without batteries

dataphon s21-23d, BTX interface
dataphon s21-23d, switches and controls, RS-232 interface


Dynamics / Ascom[edit]

  • Power: external power supply
  • 300 Baud
  • Contact 64 Software
  • Connection with expansions port
  • Control: Carrier
  • Switchs: Speaker on/off ; Answer/Originate

Radio Shack AC-3[edit]

  • 110-300 baud
  • Connection over RS232 (DSub-25, DIN)

Epson CX-21[edit]

Packinf of Epson CX-21

Data transfer rate:

  • max. 300 Baud

Power:

  • Battery (NiCd-Akku mitgeliefert)
  • Power supply (4,8V/120mA)


Switchs and controls:

  • Power on/off
  • POWER LED
  • Answer/Originate switch
  • READY LED

Interface:

  • Connection with V.24/RS232 (DSub-25)
  • Full or half duplex

Dimensions: 30 × 9,5 × 7 cm (L × B × H)

Extras: Adjustable muffle

Epson CX-21


Links[edit]

WP-W11.png Wikipedia: Acoustic_coupler