Multitech MultiDSU56K MT56DSU-R Owner's Manual page 47

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Appendix A - Application Examples
DDS Multi-Point (Polled) Application
Since your Central Office (CO) equipment must include “Multi-point
Junction Units” (MJUs) and other special arrangements for this type
of service, you may need to coordinate efforts with your network
service provider.
The MT56DSU-R at the host end is the Master Station (also called
the “Control Station”), which typically has RTS forced on. The
attached MT56DSU-Rs are called "Remote stations” and have RTS
controlled by the DTE.
Multi-point DDS provides communication between a control station
and two or more remote stations. All data transmitted by the control
station is sent to each remote station. For data transmitted from the
remote stations, the MJUs combine bit streams from the remote
stations into a single, serial bit stream sent to the control station. All
stations on the same multi-point circuit must run at the same bit rate
(any of the DDS customer service rates).
The figure below shows a typical Multi-point (Polled) application.
Figure A-2. DDS Multi-Point Polled Application
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