Toa SR-D8- M Installation Manual page 22

10.7.2. redundant configuration of switching hubs
Shown below is the connection example of the 4 stack configuration, in which each SR-D8-M is connected to
switching hubs.
In the connection example below, the CobraNet PRIMARY and SECONDARY terminals of each unit are
individually connected to different switching hubs. Even if any one of the switching hubs fails or Main line
breaks, the system is kept operating using another Main line, thus preventing system down.
Notes
• Cycle the entire system's power after connection completion.
• Perform spanning tree setting within switching hubs. For the settings, refer to the instruction manual of the
switching hub.
• Audio signals may be interrupted temporarily at the time when the network configuration automatically
changes due to failure of any switching hub or disconnection of the main line.
• Contact your TOA dealer for more information on switching hubs.
SR-D8-M
bottom terminals
To other
switching hub
Switching hub
(SECONDARY)
SR-D8-M
bottom terminals
22
Main line
SR-D8-M
bottom terminals
Switching hub
(PRIMARY)
SR-D8-M
bottom terminals
Other CobraNet unit
PRIMARY
SECONDARY
Main line
Category 5 or higher standard straight through
cable for LAN (with RJ45 connectors)
To other
switching hub