RAD RSD-10 8 CHANNEL PROGRAMMABLE SHARING DEVICE
Part Number: RSD-10
FEATURES
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.
SPECIFICATIONS
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
