FEATURES

• The RSD-1 Digital Sharing Device enables up to 4 modems or terminals to share a master modem, a multiplexer or a computer port in a multipoint environment. RSD-1 is compatible with asynchronous or synchronous equipment at data rates up to 19.2 kbps.

• Three clock modes are supported:
  - Internal
  - External from the main channel
  - External from subchannel 1.

• A built-in buffer overcomes possible phase differences between the RSD-1 main channel transmit clock and the clocks of modems connected to the subchannels.

• A DCE/DTE switch for main channel and each subchannel allows setting the channel's interface as DCE or DTE.

• The main channel broadcasts to all subchannels in parallel. Subchannels contend to transmit to the main channel by activating RTS/DCD or by data transitions (strap-selectable). If the RTS/DCD is active or data transitions occur on a subchannel, its transmit data and control signals are connected to the main channel. When RTS/DCD drops or data transitions stop, the control circuitry is switched to monitor other subchannels. A subchannel is disconnected immediately after it drops RTS/DCD or transmits 15 idle bits.

• A subchannel can be disabled by automatic circuitry if it stays active for longer than a preset time, blocking all other subchannels (streaming). The automatic disable resets itself as soon as the subchannel RTS/DCD drops, or 15 idle bits are transmitted (Data Contention). Individual subchannel indicators on the front panel indicate if a subchannel was disabled by automatic circuitry. Manual disabling of a subchannel is also enabled via individual subchannel switches.

• RSD-1 is available as a desktop unit or as a rack-mount card for the RSD-MN-12 rack. The rack can carry up to 12 RSD-1 cards and is supplied with 64-pin connectors. One or two power transformers are installed inside the rack providing hot standby backup.

SPECIFICATIONS 

• Operates with any combination of up to four DTEs or DCEs
• Synchronous or asynchronous up to 19.2 kbps
• RTS/DCD or data contention
• Individual subchannel disable switch
• DCE/DTE switch for main channel and each subchannel
• Automatic disabling of streaming subchannel to avoid blocking of the unit
• Internal or external clock
• Cascadable
• Standalone unit or card for the RSD-MN-12 rack
• Easy to install and configure
• 1U height for minimal rack space

RSD-1/*/&
Digital sharing device, standalone unit with internal power supply

RSD-1R
Digital sharing device card for the RSD-MN-12 19" rack

RSD-MN-12
19" rack for 12 plug-in cards (single power supply)

RSD-MN-12/RDNT
RSD-MN-12 rack and control card, with dual redundant power supplies

CBL-RSD-MN
64-pin connector to five 25-pin connectors for V.24 interfaces

ORDERING

RSD-1
RSD-1/48
RSD-1/B
RSD-1/R 

APPLICATIONS