The DSD-425 and DSD-825 RS-232/V.24 automatic Digital Sharing Devices, operate at data rates up to 76.8 Kbps
synchronously and up to 115.2 Kbps asynchronously, enable any combination of up to four terminals or modems
to share a master modem, multiplexer port or computer port. Clocking for synchronous data can be from one of three sources: external up to 76.8 Kbps from the device connected to the master port, external from any subchannel via pin-24 when connected to a DTE or pin-17 when connected to a DCE, or internal.
The DSD-425 is a four-port device and the DSD-825 is an eight-port device. Both models feature front panel port
enable/disable switches, LEDs to indicate selected or disabled sub-channels, power, streaming sub-channels,
and data activity. Basic selectable options include: clock source, antistreaming and automatic sub-channel
restoral. Each sub-channel has selectable “Data”/control-signal contention, tail circuit buffer capability, and DTE/
DCE personality options.