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Interface Products / 933 Line Isolation Unit

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Omnitronics' range of reliable, easy-to-use Communication Interfaces is designed to give you the flexibility you need in managing your radio communications. The range includes 4 wire line isolation, DTMF decoder, Selcal Monitor, Alarm Tone Interface and 24V to 12V converters. These units allow you to interconnect products within the Omnitronics range as well as interface Omnitronics and OEM products.

Price Guide (Inc GST): POA

933 Line Isolation Unit (AUSTEL approved)

The 933 Line Isolation Unit (LIU) allows you to connect equipment that is not approved to Australian Telecommunications Standards to the local telecommunications network via a PABX extension.


The Omnitronics 900DEN module has been designed to allow 4 wire audio lines, with in-band signalling, to connect directly into the Omnitronics 619 series of audio bridges or any other 4 wire plus E & M device.

970DD DTMF Decoder

The 970DD DTMF Decoder provides an easy interface for equipment requiring DTMF control. An operator using our 960CSD console, or from the field using a DTMF enabled mobile radio, can initiate channel change, Features:

  • 12 open collector control outputs (BCD or Binary)
  • Local or landline control
  • Auto acknowledge option

970SM Selcal Monitor

Selcal has traditionally been limited to a method of calling individuals or groups in a two-way radio system.

Omnitronics have developed the 970SM module that provides a wide range of additional facilities that will significantly expand the use of a radio communications system. Its ability to handle a number of inputs and outputs, together with its in-built relay and alarm tone generator gives access to a wide range of telemetry functions usually associated with much more sophisticated and expensive products.

PS915 24V to 12V Isolated Converter

The unique PS915 24 to 12 Volt Isolated Converter is the perfect solution for hard electrical and physical environments encountered in vehicles and radio huts.

Proprietary Interfaces

Contact Omnitronics for details on devices such as the 934PI and 937BLI that can make interfacing between Omnitronics products much easier.

935LRI Local Radio Interface

The 935 Local Radio Interface allows direct connection of the Omnitronics handsets and consoles up to 100 metres from a base station transceiver.

936MPI Multi-Purpose Interface

  • The 936 Multipurpose Interface boasts three methods of operation as follows:
  • Provides connection between Omnitronics Handsets and the Radio Port
  • Provides connection between the 925 Line Keying Interface and Radio Port
  • Allows connection between the 925 Line Keying Interface and Radio Ports, enabling radios to be connected back to back or to connect a bridge to an unbalanced radio

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