RAD MMS 2-Channel Modem Sharing Device

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RAD MMS 2-Channel Modem Sharing Device


  • MMS, a Modem Sharing Device, enables two DTEs to share a master modem or a multiplexer in a multidrop environment.
  • MMS operates with synchronous or asynchronous equipment. It transfers the timing signals from the modem connected to the main channel, to the subchannels. MMS is cascadable - several units can be cascaded to increase the number of subchannels.
  • The main channel broadcasts information to subchannels in parallel. Subchannels contend to transmit to the main channel by activating RTS. If RTS is raised, the subchannel's transmit data and control signals are connected to the main channel. When RTS drops, control circuitry is switched to monitor the other subchannel.
  • No AC power required; the unit uses ultra-low power derived from the RS-232/V.24 data and control signals.


  • Synchronous and asynchronous
  • Data rates up to 38.4 kbps
  • Cascadable
  • RTS contention
  • No external power required
  • Easy to install and configure
  • Miniature, lightweight

2-channel Modem Sharing Device 




RAD Products

For discount pricing on RAD Data Communications  
email us at sales@data-connect.com
or call 301-924-7400