Programmable Sharing Devices

RAD's RSD-1 programmable sharing device and RSD-10 programmable sharing device enable multiple modems or terminals to share a master modem, a multiplexer or a computer point in a multipoint environment. The RSD-1 programmable sharing device supports up to four DCEs/DTEs while the RSD-10 programmable sharing device supports up to eight DCEs/DTEs. The units operate transparently at a data rate of up to 19.2 Kbps, synchronously or asynchronously.

• Any combination of modems (DCEs) and terminals (DTEs) can be shared

• Reduce the number of lines needed to transmit data

The RSD digital sharing devices enable any combination of DCEs and/or DTEs to share a modem, multiplexer or computer port in a multipoint environment. RSD-1 supports up to four DCEs/DTEs; RSD-10 supports up to eight. They are completely transparent to the system and the data, and operate with sync or async equipment. The units generate timing signals internally or operate with external clocks, either from the main channel or from subchannel 1.

The main channel broadcasts information to all subchannels in parallel. Subchannels contend to transmit to the main channel by activating RTS/DCD or by data transitions.

The devices can be configured to automatically disable any channel that stays active for longer than a preset time and blocks all other subchannels.

Permanent disabling of a subchannel is possible by setting the front panel switches. Installation and configuration of the RSD units is easy. All necessary crossover connections are defined internally via a DCE/DTE switch, and only straight-through cables are used to connect the modems or terminals to the RSD-1 and RSD-10. The interfaces are RS-232/V.24 and the connectors are 25-pin D-type, female.