RAD RSD-10 8 Channel Programmable Sharing Device 

Call us for Pre-sales and discount pricing

  301-924-7400 Support

RAD RSD-10 8 Channel Programmable Sharing Device 


  • The RSD-10 Digital Sharing Device enables up to 8 modems or terminals to share a master modem, a multiplexer or a computer port in a multipoint environment. It operates at seven selectable data rates up to 19.2 kbps, synchronously or asynchronously.

    Three clock modes are supported:
    1) Internal
    2) External from the main channel
    3) External from DCE connected to sub-channel 1.
    A built-in buffer overcomes clock differences between the modem clocks connected to the sub-channels and the RSD-10 main channel transmit clock.

    An additional buffer can be switch-selected for equipment which must provide clock to multiple sub-channels. (Examples are D.D.S. in the U.S., any digital service in other countries, or modems that cannot be set to an external clock.)

    Information is broadcasted by the main channel to all sub-channels in parallel. Sub-channels contend to transmit to the main channel by activating RTS/DCD, or by data transition (strap-selectable). If the RTS/DCD or data of a sub-channel is active, the sub-channel's transmit data and control signals are connected to the main channel. When RTS/DCD drops or data transmission ceases, the control circuitry switches to monitor other sub-channels.

    A sub-channel is disconnected immediately after it drops RTS/DCD or transmits 16 idle bits.

    To prevent blockage to other sub-channels in event of streaming, a sub-channel can be disabled by automatic circuitry if it remains active for longer than a preset time.
    The automatic disable resets whenever the sub-channel RTS/DCD drops, or 16 idle bits are transmitted (data contention). Front panel indication is provided for each sub-channel disabled by automatic circuitry. The sub-channel can be manually disabled from the front panel as an alternative.

    Installation and configuration of the RSD-10 is simple. Minimal strapping adjustments enable easy installation and operation. All necessary crossover connections are performed internally, and only straight-through cables are used to connect the modems or terminals to the RSD-10. The RSD-10 is provided with special hardware for mounting in a 19" rack, occupying 1U in height.


  • Operates with any combination of 8 DTEs or DCEs
  • Synchronous or asynchronous up to 19.2 kbps
  • RTS/DCD or data contention
  • DCE/DTE switch for main and each sub-channel
  • Automatic disabling of sub-channel in event of streaming
  • Individual sub-channel manual disable switches
  • Internal or external clocks
  • 1U height for minimal rack space
  • Cascadeable
  • Easy to install and configure

Digital Sharing Device

* Specify power supply:
48 for -48 VDC
(default is 115/230 VAC switchable)





RAD Products

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