A brief description is given of the plessey "roadfone" system for use on motorways and similar roads. Based on a specification drawn up by the Department of Transport, the system is built up of a number of modules, each capable of operating up to 16 telephones. Each module consists of: a bridging unit to which 16 telephones are connected, an answering unit at the control centre and a key and lamp strip mounted on the operator's desk. The control signals required and the circuit techniques are outlined. Other facilities, by which the basic system may be enhanced, are listed. /TRRL/

  • Corporate Authors:

    Plessey Telecommunications

    Plessey Radar Division
    Liverpool,   England 
  • Authors:
    • Greenaway, J F
  • Publication Date: 1978-8


  • English

Media Info

  • Features: Figures; Photos;
  • Pagination: p. 23-25
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00189240
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Apr 12 1979 12:00AM