The DTMF Signalling Converter type 4672 is a single plug-in extended Eurocard module
designed to convert bothway Gen-Gen Signalling to Dual Tone Multi Frequency (DTMF) or
E&M on 2 wire circuits and provide through transmission during the non-signalling mode.

Two versions are available, the 4672 for shelf mounting and the 4850 with a built in ring
current generator for four circuits in a 1U case.

• Converts from Gen-Gen (17-25Hz) bothway automatic manual signalling to
  DTMF or DC5A (E&M).
• Front panel selection of incoming and outgoing DTMF tone frequencies
  permits selective calling on omnibus circuits.
• Output signalling link selectable for slave or timed duration.
• Port impedances 600ohm with insertion loss link selectable in both directions,
  through audio transmission disabled during signalling.
• Front panel LED indicator shows power and signalling status.
• Single extended Eurocard 7E format for 19" shelf or stand alone case.