3-85
Chapter 3
INSTALLATION AND SETTING PROCEDURES (HARDWARE)
8.8.2. RedundantcongurationofRSTP-compliantswitchinghubs
In the connection example below, both LAN link A and B terminals of each unit are connected to the same
switching hub. By using switching hubs with failure status output function, if any one of switching hubs fails or
the main line breaks, such a failure can be detected.
Notes
• Up to 7-level cascade is allowed for switching hub connections.
• After connection completion, reactivate the VX-3000 units.
• Perform spanning tree setting within switching hubs.
• The "External failure input" function needs be assigned to the unit's control input terminal to which the switching
hub's failure status output is connected. (For details, see the separate Setting Software Instructions, "EVENT
SETTINGS" and "Failure Pattern Settings.")
VX-3000F
VX-3000F
: LAN
: Control line
VX-3000PM
VX-3000CT
Switching hub
Switching hub
Switching hub
Switching hub
Note: Contact your TOA dealer for more information on switching hubs.
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